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MEMORY_USAGE_OPS_HISTORY

The MEMORY_USAGE_OPS_HISTORY table describes the history of memory-related operations and the execution basis of the current TiDB instance.

USE information_schema; DESC memory_usage_ops_history;
+----------------+---------------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------------------+------+------+---------+-------+ | TIME | datetime | NO | | NULL | | | OPS | varchar(20) | NO | | NULL | | | MEMORY_LIMIT | bigint(21) | NO | | NULL | | | MEMORY_CURRENT | bigint(21) | NO | | NULL | | | PROCESSID | bigint(21) unsigned | YES | | NULL | | | MEM | bigint(21) unsigned | YES | | NULL | | | DISK | bigint(21) unsigned | YES | | NULL | | | CLIENT | varchar(64) | YES | | NULL | | | DB | varchar(64) | YES | | NULL | | | USER | varchar(16) | YES | | NULL | | | SQL_DIGEST | varchar(64) | YES | | NULL | | | SQL_TEXT | varchar(256) | YES | | NULL | | +----------------+---------------------+------+------+---------+-------+ 12 rows in set (0.000 sec)
SELECT * FROM information_schema.memory_usage_ops_history;
+---------------------+-------------+--------------+----------------+---------------------+------------+------+-----------------+------+------+------------------------------------------------------------------+----------------------------------------------------------------------+ | TIME | OPS | MEMORY_LIMIT | MEMORY_CURRENT | PROCESSID | MEM | DISK | CLIENT | DB | USER | SQL_DIGEST | SQL_TEXT | +---------------------+-------------+--------------+----------------+---------------------+------------+------+-----------------+------+------+------------------------------------------------------------------+----------------------------------------------------------------------+ | 2022-10-17 22:46:25 | SessionKill | 10737418240 | 10880237568 | 6718275530455515543 | 7905028235 | 0 | 127.0.0.1:34394 | test | root | 146b3d812852663a20635fbcf02be01688f52c8d433dafec0d496a14f0b59df6 | desc analyze select * from t t1 join t t2 on t1.a=t2.a order by t1.a | +---------------------+-------------+--------------+----------------+---------------------+------------+------+-----------------+------+------+------------------------------------------------------------------+----------------------------------------------------------------------+ 2 rows in set (0.002 sec)

The columns in the MEMORY_USAGE_OPS_HISTORY table are described as follows:

  • TIME: The timestamp when the session is terminated.
  • OPS: "SessionKill"
  • MEMORY_LIMIT: The memory usage limit of TiDB at the time of termination, in bytes. Its value is the same as that of the system variable tidb_server_memory_limit](/system-variables.md#tidb_server_memory_limit-new-in-v640).
  • MEMORY_CURRENT: The current memory usage of TiDB, in bytes.
  • PROCESSID: The connection ID of the terminated session.
  • MEM: The memory usage of the terminated session, in bytes.
  • DISK: The disk usage of the terminated session, in bytes.
  • CLIENT: The client connection address of the terminated session.
  • DB: The name of the database connected to the terminated session.
  • USER: The user name of the terminated session.
  • SQL_DIGEST: The digest of the SQL statement being executed in the terminated session.
  • SQL_TEXT: The SQL statement being executed in the terminated session.
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