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 variabletidb_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.