Oracle數據庫中使用DBMS_PROFILER進行調優

DBMS_PROFILER在使用之前可能需要安裝，具體安裝步驟如下：

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

◆2：創建一個用于存放跟蹤信息的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:使用剛剛創建的profiler用戶執行如下腳本或代碼：

$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;

安裝成功后測試：

執行

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;

執行后使用下面的代碼檢查：

SELECT C.LINE#, C.TOTAL_OCCUR, C.TOTAL_TIME, C.MIN_TIME, C.MAX_TIME

FROM PLSQL_PROFILER_RUNS A, PLSQL_PROFILER_UNITS B, PLSQL_PROFILER_DATA C

WHERE A.RUN_COMMENT = '123'

AND B.UNIT_OWNER = ''

AND A.RUNID = B.RUNID

AND A.RUNID = C.RUNID

AND B.UNIT_NUMBER = C.UNIT_NUMBER

注意:每次DBMS_PROFILER.START_PROFILER的輸入參數需要改變，否則便不能分別運行后的運行結果了。

除此之外B.UNIT_OWNER =‘’中的約束值如果是在package里面需要是包名，如果是procedure則是procedure的名字。實在在不知道什么名字時可以在PLSQL_PROFILER_UNITS中查一下。

此外，運行結果可以通過PLSQL Developer來觀察，需要新建一個test,在profiler中可以查看它的運行結果，示例如下: