第一种情况:in 和 or 所在列为主键的情形。 第二种情况:in 和 or 所在列创建有索引的情形。 第二种情况:in 和 or 所在列没有索引的情形。 每种情况又采用不同的 in 和 or 的数量进行测试。由于测试语句的数据量有 4 种情况,我这里就称为 A 组、B 组、C 组、D 组,其中 A 组为 3 个值,B 组为150 个值,C 组为 30
Looking more closely, also notice that the indexed column is being used in an expression as "WHERE YEAR(o_orderdate) = 1992 AND MONTH(o_orderdate) = 4", so the index is not used. To use the existing index, you can adjust the query as follows. ...
教程:适用于 Azure Database for MySQL 灵活服务器的 Query Performance Insight 项目 2024/11/27 7 个参与者 反馈 本文内容 先决条件 使用Azure 门户配置慢查询日志 使用Azure CLI 配置慢查询日志 设置诊断 显示另外 3 个 Query Performance Insight 提供建议,以便为数据库提供智能查询分析。 首选见解是工作负载模式...
Posted Help in improving query performance 1624 Bill Tidy February 19, 2014 03:44AM Re: Help in improving query performance 884 Øystein Grøvlen February 20, 2014 04:15AM Sorry, you can't reply to this topic. It has been closed....
HeatWave is a massively parallel, high performance, in-memory query accelerator for MySQL Database Service that accelerates MySQL performance by orders of magnitude for analytics and mixed workloads. HeatWave is 6.8X faster than Amazon Redshift at half the cost, 6.8X faster than Snowflake at one...
I have created the dashboard forPercona Monitoring and Management(PMM) v2, which combines the System Performance Metrics with MySQL Performance Metrics and Query Execution information to estimate the top queries for each class. In addition to the top resources mentioned, I also add locking, which ...
我使用默认的 long_query_time,即 10 秒。我们可以使用 SLEEP() 函数强制运行 15 秒的慢速查询,如下所示:mysql> SELECT SLEEP(15); +---+ | SLEEP(15) | +---+ | 0 | +---+ 1 row in set (15.00 sec)代码语言: JavaScript (javascript) 让我们检查慢查询日志,看看 MySQL 服务器是否记录了我们...
mysql>UPDATEperformance_schema.setup_actorsSETENABLED='NO',HISTORY='NO'WHEREHOST='%'ANDUSER='%';mysql>INSERTINTOperformance_schema.setup_actors(HOST,USER,ROLE,ENABLED,HISTORY)VALUES('localhost','test_user','%','YES','YES'); Data in thesetup_actorstable should now appear similar to the foll...
NAME: statement/abstract/Query ENABLED: YES TIMED: YES PROPERTIES: mutable VOLATILITY: 0 DOCUMENTATION: SQL query just received from the network. At this point, the real statement type is unknown, the type will be refined after SQL parsing.*** 5. row*** NAME: statement/abstract/new_packet ...
Re: Query Performance 1507 Rick James June 23, 2009 10:59PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinio...