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Version: Candidate-3.4

Information Schema

The StarRocks Information Schema is a database within each StarRocks instance. Information Schema contains several read-only, system-defined views that store extensive metadata information of all objects that the StarRocks instance maintains. The StarRocks Information Schema is based on the SQL-92 ANSI Information Schema, but with the addition of views and functions that are specific to StarRocks.

From v3.2.0, The StarRocks Information Schema supports manage metadata for external catalogs.

View metadata via Information Schema​

You can view the metadata information within a StarRocks instance by querying the content of views in Information Schema.

The following example checks metadata information about a table named table1 in StarRocks by querying the view tables.

MySQL > SELECT * FROM information_schema.tables WHERE TABLE_NAME like 'table1'\G
*************************** 1. row ***************************
  TABLE_CATALOG: def
   TABLE_SCHEMA: test_db
     TABLE_NAME: table1
     TABLE_TYPE: BASE TABLE
         ENGINE: StarRocks
        VERSION: NULL
     ROW_FORMAT: 
     TABLE_ROWS: 4
 AVG_ROW_LENGTH: 1657
    DATA_LENGTH: 6630
MAX_DATA_LENGTH: NULL
   INDEX_LENGTH: NULL
      DATA_FREE: NULL
 AUTO_INCREMENT: NULL
    CREATE_TIME: 2023-06-13 11:37:00
    UPDATE_TIME: 2023-06-13 11:38:06
     CHECK_TIME: NULL
TABLE_COLLATION: utf8_general_ci
       CHECKSUM: NULL
 CREATE_OPTIONS: 
  TABLE_COMMENT: 
1 row in set (0.01 sec)

Views in Information Schema​

The StarRocks Information Schema contains the following metadata views: