RisingWave catalogs

RisingWave catalogs contain system tables and views that provide metadata about different relations in the system, as well as information about the cluster jobs and their status. The metadata includes details about each database, schema, and relation in the system, such as materialized views, tables, sources, sinks, indexes, and views. The status information includes the progress of DDL commands, system snapshots, and more.

How to display RisingWave catalogs

After you connect to RisingWave vis psql, enter \d to display RisingWave catalogs.

The result looks like this:

\d
------RESULTS
                        List of relations
   Schema   |                Name                 | Type  | Owner 
------------+-------------------------------------+-------+-------
 rw_catalog | rw_actors                           | table | root
 rw_catalog | rw_columns                          | table | root
 rw_catalog | rw_connections                      | table | root
...

You can view the schemas of these catalogs:

DESCRIBE rw_catalog.rw_ddl_progress;
------RESULTS
Name      |  Type   
---------------+---------
 ddl_id        | bigint
 ddl_statement | varchar
 progress      | varchar
(3 rows)

DESCRIBE rw_catalog.rw_meta_snapshot;
------RESULTS
          Name          |            Type
------------------------+-----------------------------
 meta_snapshot_id       | bigint
 hummock_version_id     | bigint
 safe_epoch             | bigint
 safe_epoch_ts          | timestamp without time zone
 max_committed_epoch    | bigint
 max_committed_epoch_ts | timestamp without time zone
(6 rows)

You can also retrieve the values of the catalogs. Please note that the schema (rw_catalog) is optional.

SELECT name, owner, definition FROM rw_tables;
------RESULTS
 name | owner |            definition            
------+-------+----------------------------------
 t1   |     1 | CREATE TABLE t1 (v1 INT, v2 INT)
(1 row)

You can use two time-related fields, created_at and initiated_at, to retrieve the times when an object is created and initialized. This can be useful when you want learn about when a source or materialized view is created or initialized.

SELECT name, initialized_at, created_at FROM rw_sources;
------RESULT
 name |        initialized_at         |          created_at
------+-------------------------------+-------------------------------
 s    | 2023-07-25 10:53:30.128+00:00 | 2023-07-25 10:53:30.130+00:00
(1 row)

Available RisingWave catalogs

Relation Name	Description
rw_actors	Contains the available actor IDs, their statuses, and the corresponding fragment IDs, and parallel unit IDs.
rw_columns	Contains information about columns of all relations (except sources) in the database, including their names, positions, data types, and more.
rw_connections	Contains details about the connections available in the database, such as their IDs, names, owners, types, and more.
rw_databases	Contains information about the databases available in the database, such as the IDs, names, and owners.
rw_ddl_progress	Contains the progress of running DDL statements. You can use this relation to view the progress of running DDL statements. For details, see View statement progress.
rw_description	Contains optional descriptions (comments) for each database object. Descriptions can be added with the COMMENT ON command and viewed with DESCRIBE or SHOW COLUMNS FROM command.
rw_event_logs	Contains information about events, including event IDs, timestamps, event types, and additional information if available.
rw_fragments	Contains low-level information about fragments in the database, including fragment IDs, table IDs, and more.
rw_functions	Contains information about functions in the database, including their IDs, names, schema identifiers, types, argument and return data types, programming language, and more.
rw_hummock_branched_objects	Contains information about branched objects of Hummock (the storage engine in RisingWave), including object IDs, corresponding SST IDs, and compaction group IDs.
rw_hummock_checkpoint_version	Contains information about the checkpoint version of data in Hummock (the storage engine in RisingWave), including version ID, maximum committed epoch, safe epoch, and compaction group details.
rw_hummock_compact_task_progress	Contains information about compaction task status, including compaction group IDs, task IDs, SST-related information, numbers of pending read and write IOs, and more.
rw_hummock_compaction_group_configs	Contains information about the configuration settings for the Hummock compaction groups in the database, including compaction group IDs, parent compaction group IDs, member tables, compaction settings, and active write limits.
rw_hummock_current_version	Contains information about the current version of data in Hummock (the storage engine in RisingWave), including version ID, maximum committed epoch, safe epoch, and compaction group details.
rw_hummock_meta_configs	Contains metadata configurations and their values for Hummock (the storage engine in RisingWave).
rw_hummock_pinned_snapshots	Contains information about the pinned snapshots in Hummock (the storage engine in RisingWave), including the worker node ID and the minimum pinned snapshot ID.
rw_hummock_pinned_versions	Contains information about the pinned versions in Hummock (the storage engine in RisingWave), including the worker node ID and the minimum pinned snapshot ID.
rw_hummock_sstables	Contains information about the SSTables (Sorted String Tables) used in Hummock (the storage engine in RisingWave).
rw_hummock_version_deltas	Contains information about version deltas in Hummock (the storage engine in RisingWave). A version delta represents the modifications or differences in data between consecutive epochs.
rw_indexes	Contains information about indexes in the database, including their IDs, names, schema identifiers, definitions, and more.
rw_internal_tables	Contains information about internal tables in the database. Internal tables are tables that store intermediate results (also known as internal states) of queries. Equivalent to the SHOW INTERNAL TABLES command.
rw_materialized_views	Contains information about materialized views in the database, including their names, definitions, schema and owner IDs, and access control lists.
rw_meta_snapshot	Contains information about existing snapshots of the RisingWave meta service. You can use this relation to get IDs of meta snapshots and then restore the meta service from a snapshot. For details, see Back up and restore meta service.
rw_parallel_units	Contains information about parallel worker units used for executing database operations, including their unique IDs, worker IDs, and primary keys.
rw_relation_info	Contains low-level relation information about tables, sources, materialized views, and indexes that are available in the database.
rw_relations	Contains information about relations in the database, including their unique IDs, names, types, schema IDs, and owners.
rw_schemas	Contains information about schemas that are available in the database, including their names, unique IDs, owner IDs, and more.
rw_sinks	Contains information about sinks that are available in the database, including their unique IDs, names, schema IDs, owner IDs, connector types, sink types, connection IDs, definitions, and more.
rw_sources	Contains information about sources that are available in the database, including their unique IDs, names, schema IDs, owner IDs, connector types, column definitions, row formats, append-only flags, connection IDs, and more.
rw_system_tables	Contains information about system tables in the database, including their unique IDs, names, schema IDs, owners, and more.
rw_table_fragments	Contains information about table fragments in the database, including their parent table IDs, fragment statuses, and primary keys.
rw_table_stats	Contains statistical information about tables, including their unique IDs, total key count, total key size, and total value size in bytes.
rw_tables	Contains information about tables that are available in the database, including their unique IDs, names, schema IDs, owner IDs, definitions, and more.
rw_types	Contains information about data types that are supported by the database, including their IDs and names.
rw_user_secrets	This table stores the encrypted passwords of all users in the database and is accessible exclusively to super users.
rw_users	Contains information about users that are available in the database, including their unique IDs, names, and boolean flags indicating whether they are a superuser, whether they can create databases, whether they can create other users, and whether can log in.
rw_views	Contains information about views that are available in the database, including their unique IDs, names, schema IDs, owner IDs, definitions, and more.
rw_worker_nodes	Contains information about worker nodes available in the database, such as meta nodes, compactor nodes, compute nodes, and frontend nodes. The detailed information includes their unique IDs, hostnames, ports, types, states, parallelism levels, boolean flags (indicating whether they are used for streaming, serving, or are unschedulable), kernel versions, memory, CPU, and uptime.