cardinality feedback used for this statement

2023-03-21

Plan hash value: 2490995645 ------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -----------------------------------------------------------------------------------...

存储过程显示行数、%rowcount，显示sql语句，提前定义好，然后输出变量

2023-03-07

declare ---define Cursor cur_policy_sql VARCHAR2(32767) := 'select * from (select object_id,object_name from t1111 order by object_id ) where rownum < 10' ; Cursor cur_policy is select * from (select object_id,object_name from t1111 order by object_...

Oracle 六种方法查看执行计划

2023-02-16

Oracle 六种方法查看执行计划目录：(一)六种执行计划（1）explain plan for （2）set autotrace on （3）statistics_level=all （4）dbms_xplan.display_cursor获取（5）事件10046 trace跟踪（6）awrsqrpt.sqlOracle提供了6种执行计划获取方法，各种方法侧重点不同。第一种：explain for步骤一：explain for 查询sql语句步骤二：select * from table(dbms_xplan.display()); /*优点：无需真正执行，快捷方...

ORA-04030: 在尝试分配 16328 字节 (koh-kghu call ,kollrsz) 时进程内存不足

2023-02-16

ORA-04030: 在尝试分配 16328 字节 (koh-kghu call ,kollrsz) 时进程内存不足oerr查看报错信息，是process获取不到足够的内存，server process消耗的是PGA，而非SGA[oracle@febdb ~]$ oerr ora 0403004030, 00000, "out of process memory when trying to allocate %s bytes (%s,%s)"// *Cause: Operating system process private memory was exhausted.// *Act...

查看带有A-TIME的执行计划

2023-02-02

查看带有A-TIME的执行计划的用法如下。alter session set statistics_level=all; 或者在SQL语句中添加hint:/+ gather_plan_statistics /运行完SQL语句，然后执行下面的查询语句就可以获取带有A-TIME的执行计划。select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); 示例（Oracle11gR2，Scott账户）如下。SQL> select /*+ gather_plan_statistics full(test...

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