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TiDB System Tables

This document introduces TiDB system tables.

Grant system tables

These system tables contain grant information about user accounts and their privileges:

  • user: user accounts, global privileges, and other non-privilege columns
  • db: database-level privileges
  • tables_priv: table-level privileges
  • columns_priv: column-level privileges

Server-side help system tables

Currently, the help_topic is NULL.

Statistics system tables

  • stats_buckets: the buckets of statistics
  • stats_histograms: the histograms of statistics
  • stats_meta: the meta information of tables, such as the total number of rows and updated rows

GC worker system tables

  • gc_delete_range: to record the data to be deleted

Miscellaneous system tables

  • GLOBAL_VARIABLES: global system variable table
  • tidb: to record the version information when TiDB executes bootstrap