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information-schema-memory-usage-ops-history.md

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MEMORY_USAGE_OPS_HISTORY
了解 information_schema 表 `MEMORY_USAGE_OPS_HISTORY`。

MEMORY_USAGE_OPS_HISTORY

MEMORY_USAGE_OPS_HISTORY 表描述了 TiDB 实例内存相关的历史操作和执行依据。

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)

{{< copyable "sql" >}}

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)

MEMORY_USAGE_OPS_HISTORY 表中列的含义如下:

  • TIME:终止会话的时间戳。
  • OPS:"SessionKill"
  • MEMORY_LIMIT:TiDB 终止会话时的内存使用限制,单位为 byte。其值和系统变量 tidb_server_memory_limit 相同。
  • MEMORY_CURRENT:TiDB 当前的内存使用量,单位为 byte。
  • PROCESSID:被终止会话的客户连接 ID。
  • MEM:被终止的会话已使用的内存使用量,单位是 byte。
  • DISK:被终止的会话已使用的硬盘使用量,单位是 byte。
  • CLIENT:被终止的会话的客户连接的地址。
  • DB:被终止的会话所连接的数据库名。
  • USER:被终止的会话的用户名。
  • SQL_DIGEST:被终止的会话正在执行 SQL 语句的 digest。
  • SQL_TEXT: 被终止的会话正在执行的 SQL 语句。