System Tables

Database Metadata System Tables

`dolt_branches`

dolt_branches contains information about branches known to the database.

Because the branch information is global to all clients, not just your session, dolt_branches system table is read-only. Branches can be created or deleted with the DOLT_BRANCH() stored procedure.

Schema

+------------------------+----------+
| Field                  | Type     |
+------------------------+----------+
| name                   | TEXT     |
| hash                   | TEXT     |
| latest_committer       | TEXT     |
| latest_committer_email | TEXT     |
| latest_commit_date     | DATETIME |
| latest_commit_message  | TEXT     |
| remote                 | TEXT     |
| branch                 | TEXT     |
+------------------------+----------+

Example Queries

Get all the branches.

To find the current active branch use select active_branch().

dolt_branches only contains information about local branches. For branches on a remote you have fetched, see dolt_remote_branches.

`dolt_remote_branches`

dolt_remote_branches contains information about branches on remotes you have fetched. It has the same schema as dolt_branches, but contains only branches found on remotes, not any local branches.

Schema

+------------------------+----------+
| Field                  | Type     |
+------------------------+----------+
| name                   | TEXT     |
| hash                   | TEXT     |
| latest_committer       | TEXT     |
| latest_committer_email | TEXT     |
| latest_commit_date     | DATETIME |
| latest_commit_message  | TEXT     |
+------------------------+----------+

Example Queries

Get all local and remote branches in a single query. Remote branches will have the prefix remotes/<remoteName> in their names.

SELECT *
FROM dolt_branches
UNION
SELECT * FROM dolt_remote_branches;

+-----------------+----------------------------------+------------------+------------------------+-------------------------+----------------------------+
| name            | hash                             | latest_committer | latest_committer_email | latest_commit_date      | latest_commit_message      |
+-----------------+----------------------------------+------------------+------------------------+-------------------------+----------------------------+
| main            | r3flrdqk73lkcrugtbohcdbb3hmr2bev | Zach Musgrave    | zach@dolthub.com       | 2023-02-01 18:59:55.156 | Initialize data repository |
| remotes/rem1/b1 | r3flrdqk73lkcrugtbohcdbb3hmr2bev | Zach Musgrave    | zach@dolthub.com       | 2023-02-01 18:59:55.156 | Initialize data repository |
+-----------------+----------------------------------+------------------+------------------------+-------------------------+----------------------------+

`dolt_docs`

dolt_docs stores the contents of Dolt docs (LICENSE.md, README.md).

You can modify the contents of these files via SQL, but you are not guaranteed to see these changes reflected in the files on disk.

Schema

+----------+------+
| field    | type |
+----------+------+
| doc_name | text |
| doc_text | text |
+----------+------+

`dolt_procedures`

dolt_procedures stores each stored procedure that has been created on the database.

The values in this table are implementation details associated with the storage of stored procedures. It is recommended to use built-in SQL statements for examining and modifying stored procedures rather than using this table directly.

Schema

+-------------+----------+
| field       | type     |
+-------------+----------+
| name        | longtext |
| create_stmt | longtext |
| created_at  | datetime |
| modified_at | datetime |
+-------------+----------+

When using the standard CREATE PROCEDURE workflow, the name column will always be lowercase. Dolt assumes that name is always lowercase as a result, and manually inserting a stored procedure must also have a lowercase name. Otherwise, it will be invisible to some operations, such as DROP PROCEDURE.

Example Query

CREATE PROCEDURE simple_proc1(x DOUBLE, y DOUBLE) SELECT x*y;
CREATE PROCEDURE simple_proc2() SELECT name FROM category;

`dolt_remotes`

dolt_remotes returns the remote subcontents of the repo_state.json, similar to running dolt remote -v from the Dolt command line.

The dolt_remotes table is currently read only. Use the dolt_remote() procedure to add, update or delete remotes.

Schema

+-------------+------+------+-----+---------+-------+
| Field       | Type | Null | Key | Default | Extra |
+-------------+------+------+-----+---------+-------+
| name        | text | NO   | PRI |         |       |
| url         | text | NO   |     |         |       |
| fetch_specs | json | YES  |     |         |       |
| params      | json | YES  |     |         |       |
+-------------+------+------+-----+---------+-------+

Example Query

SELECT *
FROM dolt_remotes
WHERE name = 'origin';

+--------+-----------------------------------------+--------------------------------------+--------+
| name   | url                                     | fetch_specs                          | params |
+--------+-----------------------------------------+--------------------------------------+--------+
| origin | file:///go/github.com/dolthub/dolt/rem1 | [refs/heads/*:refs/remotes/origin/*] | map[]  |
+--------+-----------------------------------------+--------------------------------------+--------+

`dolt_schemas`

dolt_schemas stores SQL schema fragments for a dolt database that are versioned alongside the database itself. Certain DDL statements will modify this table and the value of this table in a SQL session will affect what database entities exist in the session.

The values in this table are implementation details associated with the storage of certain schema elements. It is recommended to use built-in SQL statements for examining and modifying schemas, rather than using this table directly.

Schema

+----------+----------------------------------------+------+-----+---------+-------+
| Field    | Type                                   | Null | Key | Default | Extra |
+----------+----------------------------------------+------+-----+---------+-------+
| type     | varchar(64) COLLATE utf8mb4_0900_ai_ci | NO   | PRI | NULL    |       |
| name     | varchar(64) COLLATE utf8mb4_0900_ai_ci | NO   | PRI | NULL    |       |
| fragment | longtext                               | YES  |     | NULL    |       |
| extra    | json                                   | YES  |     | NULL    |       |
+----------+----------------------------------------+------+-----+---------+-------+

Currently, all VIEW, TRIGGER and EVENT definitions are stored in the dolt_schemas table. The column type defines whether the fragment is view, trigger or event. The column name is the fragment name as supplied in the CREATE statement. The column fragment stores the CREATE statement of the fragment. The column json is any additional important information such as CreateAt field for the fragment.

The values in this table are partly implementation details associated with the implementation of the underlying database objects.

Example Query

CREATE VIEW four AS SELECT 2+2 FROM dual;
CREATE TABLE mytable (x INT PRIMARY KEY);
CREATE TRIGGER inc_insert BEFORE INSERT ON mytable FOR EACH ROW SET NEW.x = NEW.x + 1;
CREATE EVENT monthly_gc ON SCHEDULE EVERY 1 MONTH DO SELECT DOLT_GC();

Then you can view them in dolt_schemas:

`dolt_tags`

dolt_tags shows information for all active tags in the current database.

DOLT_TAG() procedure can be used to INSERT and DELETE tags on the dolt_tags table.

Schema

+----------+----------+------+-----+---------+-------+
| Field    | Type     | Null | Key | Default | Extra |
+----------+----------+------+-----+---------+-------+
| tag_name | text     | NO   | PRI | NULL    |       |
| tag_hash | text     | NO   | PRI | NULL    |       |
| tagger   | text     | NO   |     | NULL    |       |
| email    | text     | NO   |     | NULL    |       |
| date     | datetime | NO   |     | NULL    |       |
| message  | text     | NO   |     | NULL    |       |
+----------+----------+------+-----+---------+-------+

Example Query

Create a tag using dolt_tag() stored procedure.

CALL DOLT_TAG('_migrationtest','head','-m','savepoint for migration testing');

+--------+
| status |
+--------+
| 0      |
+--------+

Get all the tags.

`dolt_statistics`

dolt_statistics includes currently collected database statistics. This information is stored outside of the commit graph and is not subject to versioning semantics.

Schema

+-----------------+----------+------+-----+---------+-------+
| Field           | Type     | Null | Key | Default | Extra |
+-----------------+----------+------+-----+---------+-------+
| database        | text     | NO   | PRI | NULL    |       |
| table           | text     | NO   | PRI | NULL    |       |
| index           | text     | NO   | PRI | NULL    |       |
| position        | bigint   | NO   | PRI | NULL    |       |
| version         | bigint   | NO   |     | NULL    |       |
| commit_hash     | text     | NO   |     | NULL    |       |
| row_count       | bigint   | NO   |     | NULL    |       |
| distinct_count  | bigint   | NO   |     | NULL    |       |
| null_count      | bigint   | NO   |     | NULL    |       |
| columns         | json     | NO   |     | NULL    |       |
| types           | json     | NO   |     | NULL    |       |
| upper_bound     | json     | NO   |     | NULL    |       |
| upper_bound_cnt | bigint   | NO   |     | NULL    |       |
| created_at      | datetime | NO   |     | NULL    |       |
| mcv1            | json     | NO   |     | NULL    |       |
| mcv2            | json     | NO   |     | NULL    |       |
| mcv3            | json     | NO   |     | NULL    |       |
| mcv4            | json     | NO   |     | NULL    |       |
| mcvCounts       | json     | NO   |     | NULL    |       |
+-----------------+----------+------+-----+---------+-------+

Database History System Tables

`dolt_blame_$tablename`

For every user table that has a primary key, there is a queryable system view named dolt_blame_$tablename which can be queried to see the user and commit responsible for the current value of each row. This is equivalent to the dolt blame CLI command. Tables without primary keys will not have an associated dolt_blame_$tablename.

Schema

The dolt_blame_$tablename system view has the following columns:

+-------------------+----------+
| field             | type     |
+-------------------+----------+
| commit            | text     |
| commit_date       | datetime |
| committer         | text     |
| email             | text     |
| message           | text     |
| primary key cols  |          |
+-------------------+----------+

The remaining columns are dependent on the schema of the user table. Every column from the primary key of your table will be included in the dolt_blame_$tablename system table.

Query Details

Executing a SELECT * query for a dolt_blame_$tablename system view will show you the primary key columns for every row in the underlying user table and the commit metadata for the last commit that modified that row. Note that if a table has any uncommitted changes in the working set, those will not be displayed in the dolt_blame_$tablename system view.

dolt_blame_$tablename is only available for tables with a primary key. Attempting to query dolt_blame_$tablename for a table without a primary key will return an error message.

Example Query

Consider the following example table city:

To find who set the current values, we can query the dolt_blame_city table:

`dolt_commit_ancestors`

The dolt_commit_ancestors table records the ancestors for every commit in the database. Each commit has one or two ancestors, two in the case of a merge commit.

Schema

Each commit hash has one or two entries in the table, depending on whether it has one or two parent commits. The root commit of the database has a NULL parent. For merge commits, the merge base will have parent_index 0, and the commit merged will have parent_index 1.

+--------------+------+------+-----+---------+-------+
| Field        | Type | Null | Key | Default | Extra |
+--------------+------+------+-----+---------+-------+
| commit_hash  | text | NO   | PRI |         |       |
| parent_hash  | text | NO   | PRI |         |       |
| parent_index | int  | NO   | PRI |         |       |
+--------------+------+------+-----+---------+-------+

`dolt_commits`

The dolt_commits system table shows ALL commits in a Dolt database.

This is similar, but different from the dolt_log system table and the dolt log CLI command. dolt log shows you commit history for all commit ancestors reachable from the current HEAD of the checked out branch, whereas dolt_commits shows all commits from the entire database, no matter which branch is checked out.

Schema

+-------------+----------+------+-----+---------+-------+
| Field       | Type     | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+-------+
| commit_hash | text     | NO   | PRI |         |       |
| committer   | text     | NO   |     |         |       |
| email       | text     | NO   |     |         |       |
| date        | datetime | NO   |     |         |       |
| message     | text     | NO   |     |         |       |
+-------------+----------+------+-----+---------+-------+

Example Query

Using the dolthub/first-hour-db database from DoltHub, we can query for the five commits before April 20th, 2022, across all commits in the database (regardless of what is checked out to HEAD) with this query:

`dolt_history_$TABLENAME`

For every user table named $TABLENAME, there is a read-only system table named dolt_history_$TABLENAME that can be queried to find a row's value at every commit in the current branch's history.

Schema

Every Dolt history table contains columns for commit_hash, committer, and commit_date, plus every column from the user table's schema at the current checked out branch.

+-------------+----------+
| field       | type     |
+-------------+----------+
| commit_hash | TEXT     |
| committer   | TEXT     |
| commit_date | DATETIME |
| other cols  |          |
+-------------+----------+

Example Schema

Consider a table named mytable with the following schema:

+------------+--------+
| field      | type   |
+------------+--------+
| x          | INT    |
+------------+--------+

The schema for dolt_history_states would be:

+-------------+----------+
| field       | type     |
+-------------+----------+
| x           | INT      |
| commit_hash | TEXT     |
| committer   | TEXT     |
| commit_date | DATETIME |
+-------------+----------+

Example Query

Assume a database with the mytable table above and the following commit graph:

   B---E  feature
  /
 A---C---D  main

When the feature branch is checked out, the following query returns the results below, showing the row at every ancestor commit reachable from our current branch.

`dolt_log`

The dolt_log system table contains the commit log for all commits reachable from the current HEAD. This is the same data returned by the dolt log CLI command.

Schema

+-------------+----------+
| field       | type     |
+-------------+--------- +
| commit_hash | text     |
| committer   | text     |
| email       | text     |
| date        | datetime |
| message     | text     |
+-------------+--------- +

Example Query

The following query shows the commits reachable from the current checked out head and created by user jennifersp since April, 2022:

Database Diffs

`dolt_commit_diff_$TABLENAME`

For every user table named $TABLENAME, there is a read-only system table named dolt_commit_diff_$TABLENAME that can be queried to see a diff of the data in the specified table between any two commits in the database. For example, you can use this system table to view the diff between two commits on different branches. The schema of the returned data from this system table is based on the schema of the underlying user table at the currently checked out branch.

You must provide from_commit and to_commit in all queries to this system table in order to specify the to and from points for the diff of your table data. Each returned row describes how a row in the underlying user table has changed from the from_commit ref to the to_commit ref by showing the old and new values.

dolt_commit_diff_$TABLENAME is the analogue of the dolt diff CLI command. It represents the two-dot diff between the two commits provided. The dolt_diff_$TABLENAME system table also exposes diff information, but instead of a two-way diff, it returns a log of individual diffs between all adjacent commits in the history of the current branch. In other words, if a row was changed in 10 separate commits, dolt_diff_$TABLENAME will show 10 separate rows – one for each individual delta. In contrast, dolt_commit_diff_$TABLENAME would show a single row that combines all the individual commit deltas into one diff.

The DOLT_DIFF() table function is an alternative to the dolt_commit_diff_$tablename system table for cases where a table's schema has changed between the to and from commits. Consider the DOLT_DIFF() table function if you need to see the schema from each of those commits, instead of using the schema from the currently checked out branch.

Schema

+------------------+----------+
| field            | type     |
+------------------+----------+
| from_commit      | TEXT     |
| from_commit_date | DATETIME |
| to_commit        | TEXT     |
| to_commit_date   | DATETIME |
| diff_type        | TEXT     |
| other cols       |          |
+------------------+----------+

The remaining columns are dependent on the schema of the user table at the currently checked out branch. For every column X in your table at the currently checked out branch, there are columns in the result set named from_X and to_X with the same type as X in the current schema. The from_commit and to_commit parameters must both be specified in the query, or an error is returned.

Example Schema

Consider a simple example with a table that has one column:

+--------------+
| field | type |
+--------------+
| x     | int  |
+--------------+

Based on the table's schema above, the schema of the dolt_commit_diff_$TABLENAME will be:

+------------------+----------+
| field            | type     |
+------------------+----------+
| to_x             | int      |
| to_commit        | longtext |
| to_commit_date   | datetime |
| from_x           | int      |
| from_commit      | longtext |
| from_commit_date | datetime |
| diff_type        | varchar  |
+------------------+----------+

Query Details

Now consider the following branch structure:

      A---B---C feature
     /
D---E---F---G main

We can use the above table to represent two types of diffs: a two-point diff and a three-point diff. In a two-point diff we want to see the difference in rows between Point C and Point G.

We can also compute a three-point diff using this table. In a three-point diff we want to see how our feature branch has diverged from our common ancestor E, without including the changes from F and G on main.

The dolt_merge_base function computes the closest ancestor E between main and feature.

Additional Notes

There is one special to_commit value WORKING which can be used to see what changes are in the working set that have yet to be committed to HEAD. It is often useful to use the HASHOF() function to get the commit hash of a branch, or an ancestor commit. The above table requires both from_commit and to_commit to be filled.

`dolt_diff`

The dolt_diff system table shows which tables in the current database were changed in each commit reachable from the active branch's HEAD. When multiple tables are changed in a single commit, there is one row in the dolt_diff system table for each table, all with the same commit hash. Any staged or unstaged changes in the working set are included with the value WORKING for their commit_hash. After identifying the tables that changed in a commit, the dolt_diff_$TABLENAME system tables can be used to determine the data that changed in each table.

Schema

The DOLT_DIFF system table has the following columns

+---------------+----------+
| field         | Type     |
+---------------+----------+
| commit_hash   | text     |
| table_name    | text     |
| committer     | text     |
| email         | text     |
| date          | datetime |
| message       | text     |
| data_change   | boolean  |
| schema_change | boolean  |
+---------------+----------+

Query Details

dolt_diff displays the changes from the current branch HEAD, including any working set changes. If a commit did not make any changes to tables (e.g. an empty commit), it is not included in the dolt_diff results.

Example Query

Taking the dolthub/first-hour-db database from DoltHub as our example, the following query uses the dolt_diff system table to find all commits, and the tables they changed, from the month of April, 2022.

From these results, we can see there were four commits to this database in October, 2020. Commits 224helo only changed the dolt_schemas table, commit 7jrvg1a changed the dolt_docs table, and commit 5jpgb0f made changes to two tables. We can also see which of these tables had changes made to their schemas vs just data.

To dig deeper into these changes, we can query the dolt_diff_$TABLE system tables specific to each of the changed tables, like this:

`dolt_column_diff`

The dolt_column_diff system table shows which columns and tables in the current database were changed in each commit reachable from the active branch's HEAD. When multiple columns are changed in a single commit, there is one row in the dolt_column_diff system table for each column, all with the same commit hash. Any staged changes in the working set are included with the value STAGED for their commit_hash. Any unstaged changes in the working set are included with the value WORKING for their commit_hash.

Schema

The DOLT_COLUMN_DIFF system table has the following columns

+-------------+----------+
| field       | Type     |
+-------------+----------+
| commit_hash | text     |
| table_name  | text     |
| column_name | text     |
| committer   | text     |
| email       | text     |
| date        | datetime |
| message     | text     |
| diff_type   | text     |
+-------------+----------+

Query Details

dolt_column_diff displays the changes from the current branch HEAD, including any working set changes. If a commit did not make any changes to tables (e.g. an empty commit), it is not included in the dolt_column_diff results.

Example Query

Taking the first-hour-db database from DoltHub as our example, the following query uses the dolt_column_diff system table to find commits, and tables where the name was updated.

If we narrow in on the dolt_schemas table we can count the number of commits that updated each column over the course of all our commits.

From these results, we can see that fields describing the reasons an inmate is being held are being updated far more frequently than the fields holding demographic information about inmates.

`dolt_diff_$TABLENAME`

For every user table named $TABLENAME, there is a read-only system table named dolt_diff_$TABLENAME that returns a list of diffs showing how rows have changed over time on the current branch. Each row in the result set represents a row that has changed between two adjacent commits on the current branch – if a row has been updated in 10 commits, then 10 individual rows are returned, showing each of the 10 individual updates.

Compared to the dolt_commit_diff_$TABLENAME system table, the dolt_diff_$TABLENAME system table focuses on how a particular row has evolved over time in the current branch's history. The major differences are that dolt_commit_diff_$TABLENAME requires specifying from_commit and to_commit, works on any commits in the database (not just the current branch), and returns a single combined diff for all changes to a row between those two commits. In the example above where a row is changed 10 times, dolt_commit_diff_$TABLENAME would only return a single row showing the diff, instead of the 10 individual deltas.

Schema

Every Dolt diff table will have the columns

+------------------+----------+
| field            | type     |
+------------------+----------+
| from_commit      | TEXT     |
| from_commit_date | DATETIME |
| to_commit        | TEXT     |
| to_commit_date   | DATETIME |
| diff_type        | TEXT     |
| other cols       |          |
+------------------+----------+

The remaining columns are dependent on the schema of the user table at the current branch. For every column X in your table at the current branch there will be columns in the result set named from_X and to_X with the same type as X.

Example Schema

For a table named states with the following schema:

+------------+--------+
| field      | type   |
+------------+--------+
| state      | TEXT   |
| population | BIGINT |
| area       | BIGINT |
+-------------+-------+

The schema for dolt_diff_states would be:

+------------------+----------+
| field            | type     |
+-----------------+-----------+
| from_state       | TEXT     |
| from_population  | BIGINT   |
| from_area        | TEXT     |
| from_commit      | TEXT     |
| from_commit_date | DATETIME |
| to_state         | TEXT     |
| to_population    | BIGINT   |
| to_area          | TEXT     |
| to_commit        | TEXT     |
| to_commit_date   | DATETIME |
| diff_type        | TEXT     |
+------------------+----------+

Query Details

A SELECT * query for a diff table will show you every change that has occurred to each row for every commit in this branch's history. Using to_commit or from_commit will limit the data to specific commits. There is one special to_commit value WORKING which can be used to see what changes are in the working set that have yet to be committed to HEAD. It is often useful to use the HASHOF() function to get the commit hash of a branch, or an ancestor commit. For example, to get the differences between the last commit and its parent you could use to_commit=HASHOF('HEAD') and from_commit=HASHOF('HEAD^')

For each row the field diff_type will be one of the values added, modified, or removed. You can filter which rows appear in the result set to one or more of those diff_type values in order to limit which types of changes will be returned.

Example Query

Taking the dolthub/us-jails database from DoltHub as our example, the following query will retrieve the jails whose total num_inmates_rated_for have changed the most between 2 versions.

Working Set Metadata System Tables

`dolt_conflicts`

dolt_conflicts is a system table that has a row for every table in the working set that has an unresolved merge conflict.

+---------------+-----------------+------+-----+---------+-------+
| Field         | Type            | Null | Key | Default | Extra |
+---------------+-----------------+------+-----+---------+-------+
| table         | text            | NO   | PRI |         |       |
| num_conflicts | bigint unsigned | NO   |     |         |       |
+---------------+-----------------+------+-----+---------+-------+

Query this table when resolving conflicts in a SQL session. For more information on resolving merge conflicts in SQL, see docs for the dolt_conflicts_$TABLENAME tables.

`dolt_conflicts_$TABLENAME`

For each table $TABLENAME in conflict after a merge, there is a corresponding system table named dolt_conflicts_$TABLENAME. The schema of each such table contains three columns for each column in the actual table, representing each row in conflict for each of ours, theirs, and base values.

Consider a table mytable with this schema:

+-------+------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-----+---------+-------+
| a     | int  | NO   | PRI |         |       |
| b     | int  | YES  |     |         |       |
+-------+------+------+-----+---------+-------+

If we attempt a merge that creates conflicts in this table, I can examine them with the following query:

mydb> select dolt_conflict_id, base_a, base_b, our_a, our_b, their_a, their_b from dolt_conflicts_mytable;
+------------------------+--------+--------+-------+-------+---------+---------+
| dolt_conflict_id       | base_a | base_b | our_a | our_b | their_a | their_b |
+------------------------+--------+--------+-------+-------+---------+---------+
| hWDLmYufTrm+eVjFSVzPWw | NULL   | NULL   | 3     | 3     | 3       | 1       |
| gi2p1YbSwu8oUV/WRSpr3Q | NULL   | NULL   | 4     | 4     | 4       | 2       |
+------------------------+--------+--------+-------+-------+---------+---------+

To mark conflicts as resolved, delete them from the corresponding table. To effectively keep all our values, I would simply run:

mydb> delete from dolt_conflicts_mytable;

If I wanted to keep all their values, I would first run this statement:

mydb> replace into mytable (select their_a, their_b from dolt_conflicts_mytable);

For convenience, you can also modify the our_ columns of the dolt_conflicts_mytable to update the corresponding row in mytable. The above replace statement can be rewritten as:

mydb> update dolt_conflicts_mytable set our_a = their_a, our_b = their_b;

And of course you can use any combination of ours, theirs and base rows in these statements.

Notes

Updates made to the our_ columns are applied to the original table using the primary key (or keyless hash). If the row does not exist, it will be inserted. Updates made to our_ columns will never delete a row, however.
dolt_conflict_id is a unique identifier for the conflict. It is particulary useful when writing software that needs to resolve conflicts automatically.
from_root_ish is the commit hash of the "from branch" of the merge. This hash can be used to identify which merge produced a conflict, since conflicts can accumalate across merges.

`dolt_schema_conflicts`

dolt_schema_conflicts is a system table that has a row for every table in the working set that has an unresolved schema conflict.

> SELECT table_name, description, base_schema, our_schema, their_schema FROM dolt_schema_conflicts;
+------------+--------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+
| table_name | description                          | base_schema                                                       | our_schema                                                        | their_schema                                                      |
+------------+--------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+
| people     | different column definitions for our | CREATE TABLE `people` (                                           | CREATE TABLE `people` (                                           | CREATE TABLE `people` (                                           |
|            | column age and their column age      |   `id` int NOT NULL,                                              |   `id` int NOT NULL,                                              |   `id` int NOT NULL,                                              |
|            |                                      |   `last_name` varchar(120),                                       |   `last_name` varchar(120),                                       |   `last_name` varchar(120),                                       |
|            |                                      |   `first_name` varchar(120),                                      |   `first_name` varchar(120),                                      |   `first_name` varchar(120),                                      |
|            |                                      |   `birthday` datetime(6),                                         |   `birthday` datetime(6),                                         |   `birthday` datetime(6),                                         |
|            |                                      |   `age` int DEFAULT '0',                                          |   `age` float,                                                    |   `age` bigint,                                                   |
|            |                                      |   PRIMARY KEY (`id`)                                              |   PRIMARY KEY (`id`)                                              |   PRIMARY KEY (`id`)                                              |
|            |                                      | ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin; | ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin; | ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin; |
+------------+--------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+-------------------------------------------------------------------+

Query this table when resolving schema conflicts in a SQL session. For more information on resolving schema conflicts during merge, see the docs on conflicts.

`dolt_merge_status`

The dolt_merge_status system table tells a user if a merge is active. It has the following schema:

CREATE TABLE `dolt_merge_status` (
-- Whether a merge is currently active or not
  `is_merging` tinyint NOT NULL,
 -- The commit spec that was used to initiate the merge
  `source` text,
-- The commit that the commit spec resolved to at the time of merge
  `source_commit` text,
-- The target destination working set
  `target` text,
-- A list of tables that have conflicts or constraint violations
  `unmerged_tables` text
)

Example

Let's create a simple conflict:

CREATE TABLE t (a INT PRIMARY KEY, b INT);
SELECT DOLT_COMMIT('-Am', 'base');

SELECT DOLT_CHECKOUT('-b', 'right');
ALTER TABLE t ADD c INT;
INSERT INTO t VALUES (1, 2, 1);
SELECT DOLT_COMMIT('-Am', 'right');

SELECT DOLT_CHECKOUT('main');
INSERT INTO t values (1, 3);
SELECT DOLT_COMMIT('-Am', 'left');

SELECT DOLT_MERGE('right');

Output of SELECT * from dolt_merge_status;:

+------------+--------+----------------------------------+-----------------+-----------------+
| is_merging | source | source_commit                    | target          | unmerged_tables |
+------------+--------+----------------------------------+-----------------+-----------------+
| 1          | right  | fbghslue1k9cfgbi00ti4r8417frgbca | refs/heads/main | t               |
+------------+--------+----------------------------------+-----------------+-----------------+

`dolt_status`

dolt_status returns the status of the database session, analogous to running dolt status from the command line.

Schema

+------------+---------+------+-----+
| Field      | Type    | Null | Key |
+------------+---------+------+-----+
| table_name | text    | NO   | PRI |
| staged     | tinyint | NO   | PRI |
| status     | text    | NO   | PRI |
+------------+---------+------+-----+

Example Query

SELECT *
FROM dolt_status
WHERE staged=false;

+----------------+--------+-----------+
| table_name     | staged | status    |
+----------------+--------+-----------+
| public.one_pk  | 0      | new table |
+----------------+--------+-----------+

Constraint Violation System Tables

`dolt_constraint_violations`

The dolt_constraint_violations system table contains one row for every table that has a constraint violation introduced by a merge. Dolt enforces constraints (such as foreign keys) during normal SQL operations, but it's possible that a merge puts one or more tables in a state where constraints no longer hold. For example, a row deleted in the merge base could be referenced via a foreign key constraint by an added row in the merged commit. Use dolt_constraint_violations to discover such violations.

Schema

+----------------+-----------------+------+-----+---------+-------+
| Field          | Type            | Null | Key | Default | Extra |
+----------------+-----------------+------+-----+---------+-------+
| table          | text            | NO   | PRI |         |       |
| num_violations | bigint unsigned | NO   |     |         |       |
+----------------+-----------------+------+-----+---------+-------+

`dolt_constraint_violations_$TABLENAME`

For each table $TABLENAME with a constraint violation after a merge, there is a corresponding system table named dolt_constraint_violations_$TABLENAME. Each row in the table represents a constraint violation that must be resolved via INSERT, UPDATE, or DELETE statements. Resolve each constraint violation before committing the result of the merge that introduced them.

Schema

For a hypothetical table a with the following schema:

+-------+------------+------+-----+---------+-------+
| Field | Type       | Null | Key | Default | Extra |
+-------+------------+------+-----+---------+-------+
| x     | bigint     | NO   | PRI |         |       |
| y     | varchar(1) | YES  |     |         |       |
+-------+------------+------+-----+---------+-------+

dolt_constraint_violations_a will have the following schema:

+----------------+-------------------------------------------------------+------+-----+---------+-------+
| Field          | Type                                                  | Null | Key | Default | Extra |
+----------------+-------------------------------------------------------+------+-----+---------+-------+
| violation_type | enum('foreign key','unique index','check constraint') | NO   | PRI |         |       |
| x              | bigint                                                | NO   | PRI |         |       |
| y              | varchar(1)                                            | YES  |     |         |       |
| violation_info | json                                                  | YES  |     |         |       |
+----------------+-------------------------------------------------------+------+-----+---------+-------+

Each row in the table represents a row in the primary table that is in violation of one or more constraint violations. The violation_info field is a JSON payload describing the violation.

As with dolt_conflicts, delete rows from the corresponding dolt_constraint_violations table to signal to Doltgres that you have resolved any such violations before committing.

Configuration Tables

Configuration Tables can be staged and versioned just like user tables. They always exist, even in an empty database.

`dolt_ignore`

dolt_ignore stores a list of "table name patterns", and a boolean flag for each pattern indicating whether tables that match the patterns should not be staged for commit.

This only affects the staging of new tables. Tables that have already been staged or committed are not affected the contents of dolt_ignore, and changes to those tables can still be staged.

Schema

+------------+---------+------+-----+
| Field      | Type    | Null | Key |
+------------+---------+------+-----+
| pattern    | text    | NO   | PRI |
| ignored    | tinyint | NO   |     |
+------------+---------+------+-----+

Notes

The format of patterns is a simplified version of gitignore’s patterns:

An asterisk "*" or ampersand "%" matches any number of characters.
The character "?" matches any one character.
All other characters match exactly.

If a table name matches multiple patterns with different values for ignored, the most specific pattern is chosen (a pattern A is more specific than a pattern B if all names that match A also match pattern B, but not vice versa.) If no pattern is most specific, then attempting to stage that table will result in an error.

Tables that match patterns in dolt_ignore can be force-committed by passing the --force flag to SELECT dolt_add.

dolt_diff won't display ignored tables unless the additional --ignored flag is passed.

Example Query

INSERT INTO dolt_ignore VALUES ('generated_*', true), ('generated_exception', false);
CREATE TABLE foo (pk int);
CREATE TABLE generated_foo (pk int);
CREATE TABLE generated_exception (pk int);
SELECT dolt_add('-A');
SELECT *
FROM dolt_status
WHERE staged=true;

+----------------------------+--------+-----------+
| table_name                 | staged | status    |
+----------------------------+--------+-----------+
| public.foo                 | 1      | new table |
| public.generated_exception | 1      | new table |
+----------------------------+--------+-----------+

Rebasing Tables

`dolt_rebase`

dolt_rebase is only present while an interactive rebase is in progress, and only on the branch where the rebase is being executed. For example, when rebasing the feature1 branch, the rebase will be executed on the dolt_rebase_feature1 branch, and the dolt_rebase system table will exist on that branch while the rebase is in-progress. The dolt_rebase system table starts off with the default rebase plan, which is to pick all of the commits identified for the rebase. Users can adjust the rebase plan by updating the dolt_rebase table to change the rebase action, reword a commit message, or even add new rows with additional commits to be applied as part of the rebase. For more details about rebasing, see the dolt_rebase() stored procedure.

Schema

+----------------+---------------------------------------------------+
| Field          | Type                                              |
+----------------+---------------------------------------------------+
| rebase_order   | DECIMAL(6,2)                                      |
| action         | ENUM('pick', 'drop', 'reword', 'squash', 'fixup') |
| commit_hash    | TEXT                                              |
| commit_message | TEXT                                              |
+----------------+---------------------------------------------------+

The action field can take one of the following rebase actions:

pick - apply a commit as is and keep its commit message.
drop - do not apply a commit. The row in the dolt_rebase table can also be deleted to drop a commit from the rebase plan.
reword - apply a commit, and use the updated commit message from the commit_message field in the dolt_rebase table for its commit message. Note that if you edit the commit_message but do not use the reword action, the original commit message will still be used.
squash - apply a commit, but include its changes in the previous commit instead of creating a new commit. The commit message of the previous commit will be altered to include the previous commit message as well as the commit message from the squashed commit. Note that the rebase plan MUST include a pick or reword action in the plan before a squash action.
fixup - apply a commit, but include its changes in the previous commit instead of creating a new commit. The commit message of the previous commit will NOT be changed, and the commit message from the fixup commit will be discarded. Note that the rebase plan MUST include a pick or reword action in the plan before a fixup action.

Example Queries

To squash all commits into a single commit and include the commit messages from all commits, the following query can be used:

update dolt_rebase set action = 'squash' where rebase_order > 1;

To reword a commit with commit hash '123aef456f', be sure to set the action to reword and to update the commit_message field:

update dolt_rebase set action = 'reword', commit_message = 'here is my new message' where commit_hash = '123aef456f';

To drop the second commit in the rebase plan, you can use the drop action:

update dolt_rebase set action = 'drop' where rebase_order = 2;

Or you can simply delete that row from the dolt_rebase table:

delete from dolt_rebase where rebase_order = 2;

PreviousFunctions NextSystem Variables

Last updated 22 days ago

Table of contents

Database Metadata System Tables

dolt_branches

Schema

Example Queries

dolt_remote_branches

Schema

Example Queries

dolt_docs

Schema

dolt_procedures

Schema

Example Query

dolt_remotes

Schema

Example Query

dolt_schemas

Schema

Example Query

dolt_tags

Schema

Example Query

dolt_statistics

Schema

Database History System Tables

dolt_blame_$tablename

Schema

Query Details

Example Query

dolt_commit_ancestors

Schema

dolt_commits

Schema

Example Query

dolt_history_$TABLENAME

Schema

Example Schema

Example Query

dolt_log

Schema

Example Query

Database Diffs

dolt_commit_diff_$TABLENAME

Schema

Example Schema

Query Details

Additional Notes

dolt_diff

Schema

Query Details

Example Query

dolt_column_diff

Schema

Query Details

Example Query

dolt_diff_$TABLENAME

Schema

Example Schema

Query Details

Example Query

Working Set Metadata System Tables

dolt_conflicts

dolt_conflicts_$TABLENAME

Notes

dolt_schema_conflicts

dolt_merge_status

Example

dolt_status

Schema

Example Query

Constraint Violation System Tables

dolt_constraint_violations

Schema

dolt_constraint_violations_$TABLENAME

Schema

Configuration Tables

dolt_ignore

Schema

Notes

Example Query

`dolt_branches`

`dolt_remote_branches`

`dolt_docs`

`dolt_procedures`

`dolt_remotes`

`dolt_schemas`

`dolt_tags`

`dolt_statistics`

`dolt_blame_$tablename`

`dolt_commit_ancestors`

`dolt_commits`

`dolt_history_$TABLENAME`

`dolt_log`

`dolt_commit_diff_$TABLENAME`

`dolt_diff`

`dolt_column_diff`

`dolt_diff_$TABLENAME`

`dolt_conflicts`

`dolt_conflicts_$TABLENAME`

`dolt_schema_conflicts`

`dolt_merge_status`

`dolt_status`

`dolt_constraint_violations`

`dolt_constraint_violations_$TABLENAME`

`dolt_ignore`

`dolt_rebase`