达梦库监控SQL

1、查询死锁数量

SELECT COUNT(*) FROM V$LOCK WHERE BLOCKED = 1

2、查询慢SQL

SELECT TOP 10 SQL_ID sqlId,SUBSTR(SQL_TEXT,1,100) sqlText,EXEC_TIME execTime,FINISH_TIME finishTime,N_RUNS nRuns
FROM V$LONG_EXEC_SQLS 
WHERE FINISH_TIME > '2024-10-12 10:23:12'
ORDER BY FINISH_TIME DESC;

3、查询失败作业：24小时内

SELECT NAME name,START_TIME startTime,END_TIME endTime,ERRCODE errCode,ERRINFO errInfo,JOBID jobId
FROM SYSJOB.SYSJOBHISTORIES2 
WHERE START_TIME > '2024-08-15 10:23:12'
AND ERRCODE <> 0

4、检查点状态：10分钟未刷新时间

SELECT  
DATEDIFF(SECOND, LAST_END_TIME, CURRENT_TIMESTAMP) DURATION
from V$CKPT

5、时间偏移=系统时间-数据库时间

select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual

6、长事务

select count(*) from V$SESSIONS where state = 'ACTIVE' and DATEDIFF(SECOND, LAST_SEND_TIME, CURRENT_TIMESTAMP) > 60

7、查询缓存区命中率

select name, Round(sum(rat_hit) /count(*),2) * 100  rat_hit
from v$bufferpool
WHERE name in ('NORMAL','KEEP')     
group by name