添加 '数据库/oracle/慢查询.md'

数据库/oracle/慢查询.md

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+```sql
+# 查询执行最慢的sql
+select *
+ from (select sa.SQL_ID,sa.SQL_TEXT,
+        sa.SQL_FULLTEXT,
+        sa.EXECUTIONS "执行次数",
+        round(sa.ELAPSED_TIME / 1000000, 2) "总执行时间",
+        round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均执行时间",
+        sa.COMMAND_TYPE,
+        sa.PARSING_USER_ID "用户ID",
+        u.username "用户名",
+        sa.HASH_VALUE
+     from v$sqlarea sa
+     left join all_users u
+      on sa.PARSING_USER_ID = u.user_id
+     where sa.EXECUTIONS > 10 and u.username='++用户名++'
+     order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)
+ where rownum <= 10;
+```
+
+```sql
+# 查询次数最多的sql
+select *
+ from (select s.SQL_TEXT,
+        s.EXECUTIONS "执行次数",
+        s.PARSING_USER_ID "用户名",
+        rank() over(order by EXECUTIONS desc) EXEC_RANK
+     from v$sql s
+     left join all_users u
+      on u.USER_ID = s.PARSING_USER_ID) t
+ where exec_rank <= 100;
+```