oracle数据库在实时监控sql性能时怎么筛选那些没有索引的,性能差的sql语句,需要实时的,最好能自主选择一段时间的
2条回答 默认 最新
- sunguowei1988 2017-11-13 10:01关注
SELECT sql_text, executions,
ROUND(disk_reads / executions, 2) reads_per_run,
disk_reads, buffer_gets,
ROUND((buffer_gets - disk_reads)
/ buffer_gets, 2) hit_ratio,
sql_text
FROM v$sqlarea
WHERE executions > 0
AND buffer_gets > 0
AND (buffer_gets - disk_reads) / buffer_gets < 0.80
ORDER by 3 desc ;
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