Information Schema

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

View metadata via Information Schema

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

The following example checks metadata information about a table named table1 in CelerData 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 CelerData Information Schema contains the following metadata views:

View	Description
be_bvars	`be_bvars` provides statistical information regarding bRPC.
be_cloud_native_compactions	`be_cloud_native_compactions` provides information on compaction transactions running on CNs of a shared-data cluster.
be_compactions	`be_compactions` provides statistical information on compaction tasks.
character_sets	`character_sets` identifies the character sets available.
collations	`collations` contains the collations available.
column_privileges	`column_privileges` identifies all privileges granted on columns to a currently enabled role or by a currently enabled role.
columns	`columns` contains information about all table columns (or view columns).
engines	`engines` provides information about storage engines.
events	`events` provides information about Event Manager events.
global_variables	`global_variables` provides information about global variables.
key_column_usage	`key_column_usage` identifies all columns that are restricted by some unique, primary key, or foreign key constraint.
load_tracking_logs	`load_tracking_logs` provides error information (if any) of load jobs.
loads	`loads` provides the results of load jobs. Currently, you can only view the results of Broker Load and INSERT jobs from this view.
materialized_views	`materialized_views` provides information about all asynchronous materialized views.
partitions	`partitions` provides information about table partitions.
pipe_files	`pipe_files` provides the status of the data files to be loaded via a specified pipe.
pipes	`pipes` provides information about all pipes stored in the current or specified database.
referential_constraints	`referential_constraints` contains all referential (foreign key) constraints.
routines	`routines` contains all stored routines (stored procedures and stored functions).
schema_privileges	`schema_privileges` provides information about database privileges.
schemata	`schemata` provides information about databases.
session_variables	`session_variables` provides information about session variables.
statistics	`statistics` provides information about table indexes.
table_constraints	`table_constraints` describes which tables have constraints.
table_privileges	`table_privileges` provides information about table privileges.
tables	`tables` provides information about tables.
tables_config	`tables_config` provides information about the configuration of tables.
task_runs	`task_runs` provides information about the execution of asynchronous tasks.
tasks	`tasks` provides information about asynchronous tasks.
triggers	`triggers` provides information about triggers.
user_privileges	`user_privileges` provides information about user privileges.
views	`views` provides information about all user-defined views.