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.