1. 先通过top命令查看产用资源较多的spid号 2.查询当前耗时的会话ID,用户名,sqlID等: select sid,serial#,machine,username,program,sql_hash_value,sql_id, to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session where paddr in (select addr from v$process where sp…
总耗CPU最多的前20个SQL total_worker_time AS [总消耗CPU 时间(ms)],execution_count [运行次数], qs.total_worker_time AS [平均消耗CPU 时间(ms)], last_execution_time AS [最大执行时间(ms)], , ( THEN DATALENGTH(qt.text) ) AS [使用CPU的语法], qt.text [完整语法], qt.dbid, dbname=db_name(qt.dbid)…
查询及删除重复记录的SQL语句 1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录delete from people where…
查询及删除重复记录的SQL语句 1.查找表中多余的重复记录,重复记录是根据单个字段(Id)来判断 select * from 表 where Id in (select Id from 表 group byId having count(Id) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(Id)来判断,只留有rowid最小的记录 DELETE from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id)…
不同的数据库,支持的SQL语法略有不同,以下是不同数据库查询前n条数据的SQl语句 SQL Server(MSSQL) SELECT TOP n * FROM table_name ORACLE SELECT * FROM table_name WHERE ROWNUM <= 10; MySQL SELECT * FROM table_name LIMIT 10;…
一:查询及删除重复记录的SQL语句1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录delete from peoplewhere p…
