12 2019 档案

• SQLSERVER 效能 建议加索引 EXEC sp_updatestats;
  摘要：SELECT TOP 30 [Total Cost] = ROUND(avg_total_user_cost * avg_user_impact * (user_seeks + user_scans),0) , avg_user_impact , TableName = statement , [E 阅读全文
  posted @ 2019-12-25 19:38 Snowfun 阅读(1342) 评论(0) 推荐(0)
• 数据收集 DBMS_STATS.GATHER_TABLE_STATS
  摘要：select b.SQL_CHILD_NUMBER,a.SQL_TEXT,a.SQL_FULLTEXT,a.SQL_ID,b.EVENT,b.USERNAME,b.* from gv$sql a,gv$session bwhere a.sql_id=b.sql_idand a.CHILD_NUMBE 阅读全文
  posted @ 2019-12-25 12:25 Snowfun 阅读(406) 评论(0) 推荐(0)