Let’s say, you want to analyze the stages of a query that is spending most of the time in, you need to enable the respective logging using the below query. 1 2 3 4 5 MySQL> update performance_schema.setup_consumers set ENABLED='YES' where NAME='events_stages_current'; Query OK, ...
Last_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '5d52e9bc-dca8-11e8-8f03-48df371d2499:500' at master log mysql-bin.000004, end_log_pos 6687849. See errorlog and/or performance_schema.r...
| information_schema | | mysql | | performance_schema | | sakila | | sys | | world | +---+ 8 rows in set (0.01 sec) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. SHOW DATABASES;返回可用数据库的一个列表。 使用USE选择完数据库后,我们可用SHOW TABLES;来显示数据库中...
google找了半天,总算知道原因: Connector/J 5.0.0以后的版本有一个名为useInformationSchema的数据库连接参数, 在默认连接参数情况下,useInformationSchema=false,导致Connection.getMetaData()方法返回的DatabaseMetaData 对象是com.mysql.jdbc.DatabaseMetaData,而不是com.mysql.jdbc。DatabaseMetaDataUsingInfoSchema,Databa...
当升级到 8.0.26 完成后,数据库开启正常监控采集,频繁的触发了 MySQL crash ,需要分析是什么原因导致,以下的分析日志均为测试环境模拟。 故障分析 查看crash 日志我们可以看到 crash 时 MySQL 最后执行的是一条select * from information_schema.processlist命令,从 crash 的堆栈信息来看,基本就是执行一个普通的 sql...
For those moving from MySQL to PostgreSQL, there are a few differences which you will need to get used to. One of these differences is the USE command, used to select the schema to select tables, views, etc from. PostgreSQL does not have the USE command. Instead, you can use: ...
MYSQL 5.6.16 RR隔离级别 GITD关闭 表现如下: use db不能进入数据库 show table status不能查询到表信息 schema.processlist来看有大量的 Waiting for table metadata lock 情急之下他杀掉了一大堆线程后发现还是不能恢复,最后杀掉了一个没有及时提交的事物才恢复正常。也仅仅留下了如下图的一个截图: ...
当升级到 8.0.26 完成后,数据库开启正常监控采集,频繁的触发了 MySQL crash ,需要分析是什么原因导致,以下的分析日志均为测试环境模拟。 故障分析 查看crash 日志我们可以看到 crash 时 MySQL 最后执行的是一条select * from information_schema.processlist命令,从 crash 的堆栈信息来看,基本就是执行一个普通的 sql...
5) Not associated with any database or schema. A DROP DATABASE may drop some tables within a general tablespace, but it will not drop the tablespace. 6) ALTER TABLE ... DISCARD & IMPORT will not work on tables that belong to a general tablespace. 7) The server must use Tablespace-...
value other than 0 and memory-mapped files are used as the TempTable overflow mechanism, a TempTable memory limit was reached at some point. Data can be queried in Performance Schema memory summary tables such asmemory_summary_global_by_event_name. SeeSection 29.12.20.10, “Memory Summary ...