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The crdb_internal system catalog is a schema that contains information about internal objects, processes, and metrics related to a specific database.
Warning:
We do not recommend using crdb_internal tables in production environments for the following reasons:
- The contents of
crdb_internalare unstable, and subject to change in new releases of CockroachDB, without prior notice. - There are memory and latency costs associated with each table in
crdb_internal. Accessing the tables in the schema can impact cluster stability and performance.
Data exposed by crdb_internal
Each table in crdb_internal corresponds to an internal object, process, or metric, for a specific database. crdb_internal tables are read-only.
In CockroachDB v20.2, crdb_internal includes the following tables:
| Table | Description |
|---|---|
backward_dependencies |
Contains information about backward dependencies. |
builtin_functions |
Contains information about supported functions. |
cluster_database_privileges |
Contains information about the database privileges on your cluster. |
cluster_queries |
Contains information about queries running on your cluster. |
cluster_sessions |
Contains information about cluster sessions, including current and past queries. |
cluster_settings |
Contains information about cluster settings. |
cluster_transactions |
Contains information about transactions running on your cluster. |
create_statements |
Contains information about tables and indexes in your database. |
create_type_statements |
Contains information about user-defined types in your database. |
databases |
Contains information about the databases in your cluster. |
feature_usage |
Contains information about feature usage on your cluster. |
forward_dependencies |
Contains information about forward dependencies. |
gossip_alerts |
Contains information about gossip alerts. |
gossip_liveness |
Contains information about your cluster's gossip liveness. |
gossip_network |
Contains information about your cluster's gossip network. |
gossip_nodes |
Contains information about nodes in your cluster's gossip network. |
index_columns |
Contains information about indexed columns in your cluster. |
jobs |
Contains information about jobs running on your cluster. |
kv_node_status |
Contains information about node status at the key-value layer. |
kv_store_status |
Contains information about the key-value store for your cluster. |
leases |
Contains information about leases in your cluster. |
node_build_info |
Contains information about nodes in your cluster. |
node_metrics |
Contains metrics for nodes in your cluster. |
node_queries |
Contains information about queries running on nodes in your cluster. |
node_runtime_info |
Contains runtime information about nodes in your cluster. |
node_sessions |
Contains information about sessions to nodes in your cluster. |
node_statement_statistics |
Contains statement statistics for nodes in your cluster. |
node_transaction_statistics |
Contains transaction statistics for nodes in your cluster. |
node_transactions |
Contains information about transactions for nodes in your cluster. |
node_txn_stats |
Contains transaction statistics for nodes in your cluster. |
partitions |
Contains information about partitions in your cluster. |
predefined_comments |
Contains predefined comments about your cluster. |
ranges |
Contains information about ranges in your cluster. |
ranges_no_leases |
Contains information about ranges in your cluster, without leases. |
schema_changes |
Contains information about schema changes in your cluster. |
session_trace |
Contains session trace information for your cluster. |
session_variables |
Contains information about session variables in your cluster. |
table_columns |
Contains information about table columns in your cluster. |
table_indexes |
Contains information about table indexes in your cluster. |
table_row_statistics |
Contains row count statistics for tables in the current database. |
tables |
Contains information about tables in your cluster. |
zones |
Contains information about zone configurations in your cluster. |
To list the crdb_internal tables for the current database, use the following SHOW TABLES statement:
> SHOW TABLES FROM crdb_internal;
schema_name | table_name | type | owner | estimated_row_count
----------------+-----------------------------+-------+-------+----------------------
crdb_internal | backward_dependencies | table | NULL | NULL
crdb_internal | builtin_functions | table | NULL | NULL
crdb_internal | cluster_database_privileges | table | NULL | NULL
...
Querying crdb_internal tables
To get detailed information about objects, processes, or metrics related to your database, you can read from the crdb_internal table that corresponds to the item of interest.
Tip:
To ensure that you can view all of the tables in crdb_internal, query the tables as a user with admin privileges.
Note:
Unless specified otherwise, queries to crdb_internal assume the current database.
For example, to return the crdb_internal table for the ranges of the movr database, you can use the following statement:
> SELECT * FROM movr.crdb_internal.ranges;
range_id | start_key | start_pretty | end_key | end_pretty | database_name | table_name | index_name | replicas | replica_localities | learner_replicas | split_enforced_until | lease_holder | range_size
-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------+---------------+---------------------------------+------------+----------+--------------------------+------------------+----------------------------------+--------------+-------------
1 | | /Min | \004\000liveness- | /System/NodeLiveness | | | | {1} | {"region=us-east1,az=b"} | {} | NULL | 1 | 8323
2 | \004\000liveness- | /System/NodeLiveness | \004\000liveness. | /System/NodeLivenessMax | | | | {1} | {"region=us-east1,az=b"} | {} | NULL | 1 | 9278
3 | \004\000liveness. | /System/NodeLivenessMax | \004tsd | /System/tsd | | | | {1} | {"region=us-east1,az=b"} | {} | NULL | 1 | 32377
4 | \004tsd | /System/tsd | \004tse | /System/"tse" | | | | {1} | {"region=us-east1,az=b"} | {} | NULL | 1 | 4067446
(65 rows)
