1.查看哪些sql執行最多
SELECT SCHEMA_NAME,DIGEST_TEXT,COUNT_STAR,SUM_ROWS_SENT,SUM_ROWS_EXAMINED,FIRST_SEEN,LAST_SEEN
FROM performance_schema.events_statements_summary_by_digest
where SCHEMA_NAME is not null and SCHEMA_NAME !='information_schema'
ORDER BY COUNT_STAR desc LIMIT 1;
2.哪個SQL平均響應時間最多
SELECT SCHEMA_NAME,DIGEST_TEXT,COUNT_STAR,AVG_TIMER_WAIT,SUM_ROWS_SENT,SUM_ROWS_EXAMINED,FIRST_SEEN,LAST_SEEN
FROM performance_schema.events_statements_summary_by_digest
where SCHEMA_NAME is not null and SCHEMA_NAME !='information_schema'
ORDER BY AVG_TIMER_WAIT desc LIMIT 1;
3.哪個SQL掃描的行數最多(IO消耗)
SELECT SCHEMA_NAME,DIGEST_TEXT,COUNT_STAR,AVG_TIMER_WAIT,SUM_ROWS_SENT,SUM_ROWS_EXAMINED,FIRST_SEEN,LAST_SEEN
FROM performance_schema.events_statements_summary_by_digest
where SCHEMA_NAME is not null and SCHEMA_NAME !='information_schema'
ORDER BY SUM_ROWS_EXAMINED desc LIMIT 1;
4.哪個SQL使用的臨時表最多
SELECT SCHEMA_NAME,DIGEST_TEXT,SUM_CREATED_TMP_DISK_TABLES,SUM_CREATED_TMP_TABLES,FIRST_SEEN,LAST_SEEN
FROM performance_schema.events_statements_summary_by_digest
where SCHEMA_NAME is not null and SCHEMA_NAME !='information_schema'
ORDER BY SUM_CREATED_TMP_DISK_TABLES desc LIMIT 1;
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