MySQL Information Schema#
The MySQL information_schema database provides access to a variety of database metadata useful for inspecting your database and also used by database tooling. Dolt provides a subset of the data available in information_schema, as described below. In general, all tables from MySQL’s information_schema exist, with the correct schema, but not all data is populated. If you need support for information_schema metadata that is available in MySQL, but not yet available in Dolt, please open a GitHub issue to let us know what you need.
Core Metadata Tables#
| Table | Supported | Notes and limitations |
|---|---|---|
| ADMINISTRABLE_ROLE_AUTHORIZATIONS | ❌ | |
| APPLICABLE_ROLES | ❌ | |
| CHARACTER_SETS | ✅ | |
| CHECK_CONSTRAINTS | ✅ | |
| COLLATION_CHARACTER_SET_APPLICABILITY | ✅ | |
| COLLATIONS | ✅ | |
| COLUMN_PRIVILEGES | 🟠 | Dolt does not mysql.columns_priv table yet. |
| COLUMN_STATISTICS | 🟠️ | histogram column shows only buckets key values. |
| COLUMNS | 🟠️ | View columns are not included (GitHub Issue). |
| COLUMNS_EXTENSIONS | ✅ | Reserved in MySQL for future use. |
| ENABLED_ROLES | ❌ | |
| ENGINES | ✅ | Only the InnoDB engine is supported. |
| EVENTS | ❌ | Not supported in Dolt. |
| FILES | ❌ | Not supported in Dolt. |
| KEY_COLUMN_USAGE | ✅ | |
| KEYWORDS | ✅ | |
| ndb_transid_mysql_connection_map | ❌ | Not supported in Dolt. |
| OPTIMIZER_TRACE | ❌ | Not supported in Dolt. |
| PARAMETERS | ✅ | Dolt does not support stored functions yet. |
| PARTITIONS | ❌ | Not supported in Dolt. |
| PLUGINS | ❌️ | Not supported in Dolt. |
| PROCESSLIST | 🟠️ | status column missing some cases. |
| PROFILING | ❌ | Not supported in Dolt. |
| REFERENTIAL_CONSTRAINTS | ✅ | |
| RESOURCE_GROUPS | ❌ | Not supported in Dolt. |
| ROLE_COLUMN_GRANTS | 🟠 | Dolt does not mysql.columns_priv table yet. |
| ROLE_ROUTINE_GRANTS | ❌ | |
| ROLE_TABLE_GRANTS | ❌ | |
| ROUTINES | 🟠️ | Dolt does not support stored functions yet. |
| SCHEMA_PRIVILEGES | ✅ | |
| SCHEMATA | ✅ | |
| SCHEMATA_EXTENSIONS | ✅ | |
| ST_GEOMETRY_COLUMNS | ✅ | |
| ST_SPATIAL_REFERENCE_SYSTEMS | ✅ | |
| ST_UNITS_OF_MEASURE | ✅ | |
| STATISTICS | 🟠 | cardinality column is not populated (GitHub Issue). |
| TABLE_CONSTRAINTS | ✅ | |
| TABLE_CONSTRAINTS_EXTENSIONS | ✅ | |
| TABLE_PRIVILEGES | ✅ | |
| TABLES | 🟠️ | Some columns are not populated (GitHub Issue). |
| TABLES_EXTENSIONS | ✅ | Reserved in MySQL for future use. |
| TABLESPACES_EXTENSIONS | ❌ | Reserved in MySQL for future use. |
| TRIGGERS | ✅ | |
| USER_ATTRIBUTES | 🟠 | attributes column is not populated (GitHub Issue). |
| USER_PRIVILEGES | ✅ | |
| VIEW_ROUTINE_USAGE | ❌ | |
| VIEW_TABLE_USAGE | ❌ | |
| VIEWS | 🟠 | view_definition does not match MySQL (GitHub Issue). |
InnoDB Tables#
MySQL’s information_schema also provides tables specific to the use of the InnoDB storage engine. These
tables are provided in Dolt to avoid issues with MySQL tools that read from these tables, however since Dolt uses its own storage engine, no data is
populated in these tables.