技術標籤：oracle 資料

Oracle查詢連線數和sql快慢指令碼
一、查詢執行最慢的sql

select *
  from (select sa.SQL_TEXT,
               sa.SQL_FULLTEXT,
               sa.EXECUTIONS "執行次數",
               round(sa.ELAPSED_TIME / 1000000, 2) "總執行時間",
               round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均執行時間",
               sa.COMMAND_TYPE,
               sa.PARSING_USER_ID "使用者ID",
               u.username "使用者名稱",
               sa.HASH_VALUE
          from v$sqlarea sa
          left join all_users u
            on sa.PARSING_USER_ID = u.user_id
         where sa.EXECUTIONS > 0
         order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)
 where rownum <= 50;
 

二、查詢次數最多的 sql

select *
  from (select s.SQL_TEXT,
               s.EXECUTIONS "執行次數",
               s.PARSING_USER_ID "使用者名稱",
               rank() over(order by EXECUTIONS desc) EXEC_RANK
          from v$sql s
          left join all_users u
            on u.USER_ID = s.PARSING_USER_ID) t
 where exec_rank <= 100;
 

三、oracle 檢視最大連線數

select value from v$parameter where name = 'processes' --資料庫允許的最大連線數

四、oracle 檢視當前連線數

select count(*) from v$process --當前的連線數