Oracle数据库中使用DBMS_PROFILER进行调优(1)

【赛迪网－IT技术报道】在进行数据库调优时，代码的性能瓶颈至关重要，Oracle数据库提供的DBMS_PROFILER包可以特别方便的发现瓶颈的所在之处。

DBMS_PROFILER在使用之前可能需要安装，具体安装步骤如下：

◆1：执行$ORACLE_HOME/rdbms/admin/profload.sql

◆2：创建一个用于存放跟踪信息的schema

CREATE USER profiler IDENTIFIED BY profiler DEFAULT TABLESPACE users QUOTA UNLIMITED ON users;

GRANT connect TO profiler;

CREATE PUBLIC SYNONYM plsql_profiler_runs FOR profiler.plsql_profiler_runs;

CREATE PUBLIC SYNONYM plsql_profiler_units FOR profiler.plsql_profiler_units;

CREATE PUBLIC SYNONYM plsql_profiler_data FOR profiler.plsql_profiler_data;

CREATE PUBLIC SYNONYM plsql_profiler_runnumber FOR profiler.plsql_profiler_runnumber;

◆3:使用刚刚创建的profiler用户执行如下脚本或代码：

$ORACLE_HOME/rdbms/admin/proftab.sql

GRANT SELECT ON plsql_profiler_runnumber TO PUBLIC;

GRANT SELECT, INSERT, UPDATE, DELETE ON plsql_profiler_data TO PUBLIC;

GRANT SELECT, INSERT, UPDATE, DELETE ON plsql_profiler_units TO PUBLIC;

GRANT SELECT, INSERT, UPDATE, DELETE ON plsql_profiler_runs TO PUBLIC;

安装成功后测试：

执行

BEGIN

DBMS_PROFILER.START_PROFILER('123');

FOR I IN 1 .. 1000 LOOP

INSERT INTO A VALUES (I || '');

END LOOP;

COMMIT;

DBMS_PROFILER.STOP_PROFILER();

END;