TIFLASH_TABLES

Warning

Do not use this table in production environments, as the fields of the table are unstable, and subject to change in new releases of TiDB, without prior notice.

The TIFLASH_TABLES table provides statistical information about data tables in TiFlash.

USE information_schema;
DESC tiflash_tables;

+-------------------------------------------+--------------+------+------+---------+-------+
| Field                                     | Type         | Null | Key  | Default | Extra |
+-------------------------------------------+--------------+------+------+---------+-------+
| DATABASE                                  | varchar(64)  | YES  |      | NULL    |       |
| TABLE                                     | varchar(64)  | YES  |      | NULL    |       |
| TIDB_DATABASE                             | varchar(64)  | YES  |      | NULL    |       |
| TIDB_TABLE                                | varchar(64)  | YES  |      | NULL    |       |
| TABLE_ID                                  | bigint(64)   | YES  |      | NULL    |       |
| IS_TOMBSTONE                              | bigint(64)   | YES  |      | NULL    |       |
| SEGMENT_COUNT                             | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_ROWS                                | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_SIZE                                | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_DELETE_RANGES                       | bigint(64)   | YES  |      | NULL    |       |
| DELTA_RATE_ROWS                           | double       | YES  |      | NULL    |       |
| DELTA_RATE_SEGMENTS                       | double       | YES  |      | NULL    |       |
| DELTA_PLACED_RATE                         | double       | YES  |      | NULL    |       |
| DELTA_CACHE_SIZE                          | bigint(64)   | YES  |      | NULL    |       |
| DELTA_CACHE_RATE                          | double       | YES  |      | NULL    |       |
| DELTA_CACHE_WASTED_RATE                   | double       | YES  |      | NULL    |       |
| DELTA_INDEX_SIZE                          | bigint(64)   | YES  |      | NULL    |       |
| AVG_SEGMENT_ROWS                          | double       | YES  |      | NULL    |       |
| AVG_SEGMENT_SIZE                          | double       | YES  |      | NULL    |       |
| DELTA_COUNT                               | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_DELTA_ROWS                          | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_DELTA_SIZE                          | bigint(64)   | YES  |      | NULL    |       |
| AVG_DELTA_ROWS                            | double       | YES  |      | NULL    |       |
| AVG_DELTA_SIZE                            | double       | YES  |      | NULL    |       |
| AVG_DELTA_DELETE_RANGES                   | double       | YES  |      | NULL    |       |
| STABLE_COUNT                              | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_STABLE_ROWS                         | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_STABLE_SIZE                         | bigint(64)   | YES  |      | NULL    |       |
| TOTAL_STABLE_SIZE_ON_DISK                 | bigint(64)   | YES  |      | NULL    |       |
| AVG_STABLE_ROWS                           | double       | YES  |      | NULL    |       |
| AVG_STABLE_SIZE                           | double       | YES  |      | NULL    |       |
| TOTAL_PACK_COUNT_IN_DELTA                 | bigint(64)   | YES  |      | NULL    |       |
| MAX_PACK_COUNT_IN_DELTA                   | bigint(64)   | YES  |      | NULL    |       |
| AVG_PACK_COUNT_IN_DELTA                   | double       | YES  |      | NULL    |       |
| AVG_PACK_ROWS_IN_DELTA                    | double       | YES  |      | NULL    |       |
| AVG_PACK_SIZE_IN_DELTA                    | double       | YES  |      | NULL    |       |
| TOTAL_PACK_COUNT_IN_STABLE                | bigint(64)   | YES  |      | NULL    |       |
| AVG_PACK_COUNT_IN_STABLE                  | double       | YES  |      | NULL    |       |
| AVG_PACK_ROWS_IN_STABLE                   | double       | YES  |      | NULL    |       |
| AVG_PACK_SIZE_IN_STABLE                   | double       | YES  |      | NULL    |       |
| STORAGE_STABLE_NUM_SNAPSHOTS              | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_STABLE_OLDEST_SNAPSHOT_LIFETIME   | double       | YES  |      | NULL    |       |
| STORAGE_STABLE_OLDEST_SNAPSHOT_THREAD_ID  | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_STABLE_OLDEST_SNAPSHOT_TRACING_ID | varchar(128) | YES  |      | NULL    |       |
| STORAGE_DELTA_NUM_SNAPSHOTS               | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_DELTA_OLDEST_SNAPSHOT_LIFETIME    | double       | YES  |      | NULL    |       |
| STORAGE_DELTA_OLDEST_SNAPSHOT_THREAD_ID   | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_DELTA_OLDEST_SNAPSHOT_TRACING_ID  | varchar(128) | YES  |      | NULL    |       |
| STORAGE_META_NUM_SNAPSHOTS                | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_META_OLDEST_SNAPSHOT_LIFETIME     | double       | YES  |      | NULL    |       |
| STORAGE_META_OLDEST_SNAPSHOT_THREAD_ID    | bigint(64)   | YES  |      | NULL    |       |
| STORAGE_META_OLDEST_SNAPSHOT_TRACING_ID   | varchar(128) | YES  |      | NULL    |       |
| BACKGROUND_TASKS_LENGTH                   | bigint(64)   | YES  |      | NULL    |       |
| TIFLASH_INSTANCE                          | varchar(64)  | YES  |      | NULL    |       |
+-------------------------------------------+--------------+------+------+---------+-------+
54 rows in set (0.00 sec)

Fields in the TIFLASH_TABLES table are described as follows:

DATABASE: The name of the database that the table belongs to in TiFlash.
TABLE: The name of the table in TiFlash.
TIDB_DATABASE: The name of the database that the table belongs to in TiDB.
TIDB_TABLE: The name of the table in TiDB.
TABLE_ID: The internal ID of the table, which is unique within a TiDB cluster.
IS_TOMBSTONE: Indicates whether the table can be recycled. 1 indicates that the table can be recycled, and 0 indicates that the table is in a normal state.
SEGMENT_COUNT: The number of segments in the table. A segment is a data management unit in TiFlash.
TOTAL_ROWS: The total number of rows in the table.
TOTAL_SIZE: The total size of the table (in bytes).
TOTAL_DELETE_RANGES: The total number of Delete Ranges in the table.
DELTA_RATE_ROWS: The ratio of the total rows of the table in the Delta layer to the total rows of that table.
DELTA_RATE_SEGMENTS: The proportion of segments that contain a non-empty Delta layer in the table.
DELTA_PLACED_RATE: The proportion of rows that have completed index construction of the table in the Delta layer.
DELTA_CACHE_SIZE: The size of the cache of the table in the Delta layer (in bytes).
DELTA_CACHE_RATE: The proportion of cache data of the table in the Delta layer.
DELTA_CACHE_WASTED_RATE: The proportion of invalid cache data of the table in the Delta layer.
DELTA_INDEX_SIZE: The size of the memory occupied by indexes in the Delta layer (in bytes).
AVG_SEGMENT_ROWS: The average number of rows in all segments of the table.
AVG_SEGMENT_SIZE: The average size of all segments of the table (in bytes).
DELTA_COUNT: The number of segments that contain a non-empty Delta layer in the table.
TOTAL_DELTA_ROWS: The total number of rows in the Delta layer.
TOTAL_DELTA_SIZE: The total size of the data in the Delta layer (in bytes).
AVG_DELTA_ROWS: The average number of rows of data in all Delta layers.
AVG_DELTA_SIZE: The average size of data in all Delta layers (in bytes).
AVG_DELTA_DELETE_RANGES: The average number of Delete Range operations in all Delta layers.
STABLE_COUNT: The number of segments that contain a non-empty Stable layer in the table.
TOTAL_STABLE_ROWS: The total number of rows in all Stable layers.
TOTAL_STABLE_SIZE: The total size of the data in all Stable layers (in bytes).
TOTAL_STABLE_SIZE_ON_DISK: The disk space occupied by the data in all Stable layers (in bytes).
AVG_STABLE_ROWS: The average number of rows of data in all Stable layers.
AVG_STABLE_SIZE: The average size of data in all Stable layers (in bytes).
TOTAL_PACK_COUNT_IN_DELTA: The total number of Column Files in all Delta layers.
MAX_PACK_COUNT_IN_DELTA: The maximum number of Column Files in a single Delta layer.
AVG_PACK_COUNT_IN_DELTA: The average number of Column Files in all Delta layers.
AVG_PACK_ROWS_IN_DELTA: The average number of rows in all Column Files in all Delta layers.
AVG_PACK_SIZE_IN_DELTA: The average size of data in all Column Files in all Delta layers (in bytes).
TOTAL_PACK_COUNT_IN_STABLE: The total number of Packs in all Stable layers.
AVG_PACK_COUNT_IN_STABLE: The average number of Packs in all Stable layers.
AVG_PACK_ROWS_IN_STABLE: The average number of rows in all Packs in all Stable layers.
AVG_PACK_SIZE_IN_STABLE: The average size of data in all Packs in the Stable layer (in bytes).
STORAGE_STABLE_NUM_SNAPSHOTS: The number of snapshots in the Stable layer.
STORAGE_STABLE_OLDEST_SNAPSHOT_LIFETIME: The duration of the earliest snapshot in the Stable layer (in seconds).
STORAGE_STABLE_OLDEST_SNAPSHOT_THREAD_ID: The thread ID of the earliest snapshot in the Stable layer.
STORAGE_STABLE_OLDEST_SNAPSHOT_TRACING_ID: The tracing ID of the earliest snapshot in the Stable layer.
STORAGE_DELTA_NUM_SNAPSHOTS: The number of snapshots in the Delta layer.
STORAGE_DELTA_OLDEST_SNAPSHOT_LIFETIME: The duration of the earliest snapshot in the Delta layer (in seconds).
STORAGE_DELTA_OLDEST_SNAPSHOT_THREAD_ID: The thread ID of the earliest snapshot in the Delta layer.
STORAGE_DELTA_OLDEST_SNAPSHOT_TRACING_ID: The tracing ID of the earliest snapshot in the Delta layer.
STORAGE_META_NUM_SNAPSHOTS: The number of snapshots in the meta information.
STORAGE_META_OLDEST_SNAPSHOT_LIFETIME: The duration of the earliest snapshot in the meta information (in seconds).
STORAGE_META_OLDEST_SNAPSHOT_THREAD_ID: The thread ID of the earliest snapshot in the meta information.
STORAGE_META_OLDEST_SNAPSHOT_TRACING_ID: The tracing ID of the earliest snapshot in the meta information.
BACKGROUND_TASKS_LENGTH: The length of the task queue in the background.
TIFLASH_INSTANCE: The address of the TiFlash instance.