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ADD COLUMNADD INDEXADMINADMIN CANCEL DDLADMIN CHECKSUM TABLEADMIN CHECK [TABLE|INDEX]ADMIN SHOW DDL [JOBS|QUERIES]ADMIN SHOW TELEMETRYALTER DATABASEALTER INDEXALTER INSTANCEALTER PLACEMENT POLICYALTER TABLEALTER TABLE COMPACTALTER TABLE SET TIFLASH MODEALTER USERANALYZE TABLEBACKUPBATCHBEGINCHANGE COLUMNCOMMITCHANGE DRAINERCHANGE PUMPCREATE [GLOBAL|SESSION] BINDINGCREATE DATABASECREATE INDEXCREATE PLACEMENT POLICYCREATE ROLECREATE SEQUENCECREATE TABLE LIKECREATE TABLECREATE USERCREATE VIEWDEALLOCATEDELETEDESCDESCRIBEDODROP [GLOBAL|SESSION] BINDINGDROP COLUMNDROP DATABASEDROP INDEXDROP PLACEMENT POLICYDROP ROLEDROP SEQUENCEDROP STATSDROP TABLEDROP USERDROP VIEWEXECUTEEXPLAIN ANALYZEEXPLAINFLASHBACK TABLEFLUSH PRIVILEGESFLUSH STATUSFLUSH TABLESGRANT <privileges>GRANT <role>INSERTKILL [TIDB]LOAD DATALOAD STATSMODIFY COLUMNPREPARERECOVER TABLERENAME INDEXRENAME TABLEREPLACERESTOREREVOKE <privileges>REVOKE <role>ROLLBACKSAVEPOINTSELECTSET DEFAULT ROLESET [NAMES|CHARACTER SET]SET PASSWORDSET ROLESET TRANSACTIONSET [GLOBAL|SESSION] <variable>SHOW ANALYZE STATUSSHOW [BACKUPS|RESTORES]SHOW [GLOBAL|SESSION] BINDINGSSHOW BUILTINSSHOW CHARACTER SETSHOW COLLATIONSHOW [FULL] COLUMNS FROMSHOW CONFIGSHOW CREATE PLACEMENT POLICYSHOW CREATE SEQUENCESHOW CREATE TABLESHOW CREATE USERSHOW DATABASESSHOW DRAINER STATUSSHOW ENGINESSHOW ERRORSSHOW [FULL] FIELDS FROMSHOW GRANTSSHOW INDEX [FROM|IN]SHOW INDEXES [FROM|IN]SHOW KEYS [FROM|IN]SHOW MASTER STATUSSHOW PLACEMENTSHOW PLACEMENT FORSHOW PLACEMENT LABELSSHOW PLUGINSSHOW PRIVILEGESSHOW [FULL] PROCESSSLISTSHOW PROFILESSHOW PUMP STATUSSHOW SCHEMASSHOW STATS_HEALTHYSHOW STATS_HISTOGRAMSSHOW STATS_METASHOW STATUSSHOW TABLE NEXT_ROW_IDSHOW TABLE REGIONSSHOW TABLE STATUSSHOW [FULL] TABLESSHOW [GLOBAL|SESSION] VARIABLESSHOW WARNINGSSHUTDOWNSPLIT REGIONSTART TRANSACTIONTABLETRACETRUNCATEUPDATEUSEWITH
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mysql- INFORMATION_SCHEMA
- Overview
ANALYZE_STATUSCLIENT_ERRORS_SUMMARY_BY_HOSTCLIENT_ERRORS_SUMMARY_BY_USERCLIENT_ERRORS_SUMMARY_GLOBALCHARACTER_SETSCLUSTER_CONFIGCLUSTER_HARDWARECLUSTER_INFOCLUSTER_LOADCLUSTER_LOGCLUSTER_SYSTEMINFOCOLLATIONSCOLLATION_CHARACTER_SET_APPLICABILITYCOLUMNSDATA_LOCK_WAITSDDL_JOBSDEADLOCKSENGINESINSPECTION_RESULTINSPECTION_RULESINSPECTION_SUMMARYKEY_COLUMN_USAGEMETRICS_SUMMARYMETRICS_TABLESPARTITIONSPLACEMENT_POLICIESPROCESSLISTREFERENTIAL_CONSTRAINTSSCHEMATASEQUENCESSESSION_VARIABLESSLOW_QUERYSTATISTICSTABLESTABLE_CONSTRAINTSTABLE_STORAGE_STATSTIDB_HOT_REGIONSTIDB_HOT_REGIONS_HISTORYTIDB_INDEXESTIDB_SERVERS_INFOTIDB_TRXTIFLASH_REPLICATIKV_REGION_PEERSTIKV_REGION_STATUSTIKV_STORE_STATUSUSER_PRIVILEGESVARIABLES_INFOVIEWS
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- Glossary
Information Schema
Information Schema provides an ANSI-standard way of viewing system metadata. TiDB also provides a number of custom INFORMATION_SCHEMA tables, in addition to the tables included for MySQL compatibility.
Many INFORMATION_SCHEMA tables have a corresponding SHOW command. The benefit of querying INFORMATION_SCHEMA is that it is possible to join between tables.
Tables for MySQL compatibility
| Table Name | Description |
|---|---|
CHARACTER_SETS | Provides a list of character sets the server supports. |
COLLATIONS | Provides a list of collations that the server supports. |
COLLATION_CHARACTER_SET_APPLICABILITY | Explains which collations apply to which character sets. |
COLUMNS | Provides a list of columns for all tables. |
COLUMN_PRIVILEGES | Not implemented by TiDB. Returns zero rows. |
COLUMN_STATISTICS | Not implemented by TiDB. Returns zero rows. |
ENGINES | Provides a list of supported storage engines. |
EVENTS | Not implemented by TiDB. Returns zero rows. |
FILES | Not implemented by TiDB. Returns zero rows. |
GLOBAL_STATUS | Not implemented by TiDB. Returns zero rows. |
GLOBAL_VARIABLES | Not implemented by TiDB. Returns zero rows. |
KEY_COLUMN_USAGE | Describes the key constraints of the columns, such as the primary key constraint. |
OPTIMIZER_TRACE | Not implemented by TiDB. Returns zero rows. |
PARAMETERS | Not implemented by TiDB. Returns zero rows. |
PARTITIONS | Provides a list of table partitions. |
PLUGINS | Not implemented by TiDB. Returns zero rows. |
PROCESSLIST | Provides similar information to the command SHOW PROCESSLIST. |
PROFILING | Not implemented by TiDB. Returns zero rows. |
REFERENTIAL_CONSTRAINTS | Provides information on FOREIGN KEY constraints. |
ROUTINES | Not implemented by TiDB. Returns zero rows. |
SCHEMATA | Provides similar information to SHOW DATABASES. |
SCHEMA_PRIVILEGES | Not implemented by TiDB. Returns zero rows. |
SESSION_STATUS | Not implemented by TiDB. Returns zero rows. |
SESSION_VARIABLES | Provides similar functionality to the command SHOW SESSION VARIABLES |
STATISTICS | Provides information on table indexes. |
TABLES | Provides a list of tables that the current user has visibility of. Similar to SHOW TABLES. |
TABLESPACES | Not implemented by TiDB. Returns zero rows. |
TABLE_CONSTRAINTS | Provides information on primary keys, unique indexes and foreign keys. |
TABLE_PRIVILEGES | Not implemented by TiDB. Returns zero rows. |
TRIGGERS | Not implemented by TiDB. Returns zero rows. |
USER_PRIVILEGES | Summarizes the privileges associated with the current user. |
VARIABLES_INFO | Provides information about TiDB system variables. |
VIEWS | Provides a list of views that the current user has visibility of. Similar to running SHOW FULL TABLES WHERE table_type = 'VIEW' |
Tables that are TiDB extensions
| Table Name | Description |
|---|---|
ANALYZE_STATUS | Provides information about tasks to collect statistics. |
CLIENT_ERRORS_SUMMARY_BY_HOST | Provides a summary of errors and warnings generated by client requests and returned to clients. |
CLIENT_ERRORS_SUMMARY_BY_USER | Provides a summary of errors and warnings generated by clients. |
CLIENT_ERRORS_SUMMARY_GLOBAL | Provides a summary of errors and warnings generated by clients. |
CLUSTER_CONFIG | Provides details about configuration settings for the entire TiDB cluster. This table is not applicable to TiDB Cloud. |
CLUSTER_DEADLOCKS | Provides a cluster-level view of the DEADLOCKS table. |
CLUSTER_HARDWARE | Provides details on the underlying physical hardware discovered on each TiDB component. This table is not applicable to TiDB Cloud. |
CLUSTER_INFO | Provides details on the current cluster topology. |
CLUSTER_LOAD | Provides current load information for TiDB servers in the cluster. This table is not applicable to TiDB Cloud. |
CLUSTER_LOG | Provides a log for the entire TiDB cluster. This table is not applicable to TiDB Cloud. |
CLUSTER_PROCESSLIST | Provides a cluster-level view of the PROCESSLIST table. |
CLUSTER_SLOW_QUERY | Provides a cluster-level view of the SLOW_QUERY table. |
CLUSTER_STATEMENTS_SUMMARY | Provides a cluster-level view of the STATEMENTS_SUMMARY table. |
CLUSTER_STATEMENTS_SUMMARY_HISTORY | Provides a cluster-level view of the STATEMENTS_SUMMARY_HISTORY table. |
CLUSTER_TIDB_TRX | Provides a cluster-level view of the TIDB_TRX table. |
CLUSTER_SYSTEMINFO | Provides details about kernel parameter configuration for servers in the cluster. This table is not applicable to TiDB Cloud. |
DATA_LOCK_WAITS | Provides the lock-waiting information on the TiKV server. |
DDL_JOBS | Provides similar output to ADMIN SHOW DDL JOBS |
DEADLOCKS | Provides the information of several deadlock errors that have recently occurred. |
INSPECTION_RESULT | Triggers internal diagnostics checks. This table is not applicable to TiDB Cloud. |
INSPECTION_RULES | A list of internal diagnostic checks performed. This table is not applicable to TiDB Cloud. |
INSPECTION_SUMMARY | A summarized report of important monitoring metrics. This table is not applicable to TiDB Cloud. |
METRICS_SUMMARY | A summary of metrics extracted from Prometheus. This table is not applicable to TiDB Cloud. |
METRICS_SUMMARY_BY_LABEL | See METRICS_SUMMARY table. |
METRICS_TABLES | Provides the PromQL definitions for tables in METRICS_SCHEMA. This table is not applicable to TiDB Cloud. |
PLACEMENT_POLICIES | Provides information on all placement policies. This table is not applicable to TiDB Cloud. |
SEQUENCES | The TiDB implementation of sequences is based on MariaDB. |
SLOW_QUERY | Provides information on slow queries on the current TiDB server. |
STATEMENTS_SUMMARY | Similar to performance_schema statement summary in MySQL. |
STATEMENTS_SUMMARY_HISTORY | Similar to performance_schema statement summary history in MySQL. |
TABLE_STORAGE_STATS | Provides details about table sizes in storage. |
TIDB_HOT_REGIONS | Provides statistics about which regions are hot. This table is not applicable to TiDB Cloud. |
TIDB_HOT_REGIONS_HISTORY | Provides history statistics about which Regions are hot. |
TIDB_INDEXES | Provides index information about TiDB tables. |
TIDB_SERVERS_INFO | Provides a list of TiDB servers (namely, tidb-server component) |
TIDB_TRX | Provides the information of the transactions that are being executed on the TiDB node. |
TIFLASH_REPLICA | Provides details about TiFlash replicas. |
TIKV_REGION_PEERS | Provides details about where regions are stored. |
TIKV_REGION_STATUS | Provides statistics about regions. |
TIKV_STORE_STATUS | Provides basic information about TiKV servers. |
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