知识大全绑定变量的获取

Posted 2022-07-15 变量

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　　对于带有绑定变量的SQL语句 ORACLE在第一次执行的时候将会进行绑定变量的PEEK 是否PEEK是否隐含参数_OPTIM_PEEK_USER_BINDS控制默认为TRUE ORACLE在第一次

　　PEEK之后将绑定变量的值放到V$SQL BIND_DATA列里如下

　　SQL> SELECT COUNT( ) FROM TEST;

　　COUNT( )

　　SQL> DESC TEST;

　　Name Null? Type

　　OWNER VARCHAR ( )

　　NAME VARCHAR ( )

　　TYPE VARCHAR ( CHAR)

　　LINE NUMBER

　　TEXT VARCHAR ( )

　　SQL> SELECT LINE COUNT( ) FROM TEST GROUP BY LINE;

　　LINE COUNT( )

　　SQL> VARIABLE LINE NUMBER

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> COL SQL_ID FORMAT A

　　SQL> COL BIND_DATA FORMAT A

　　SQL> SELECT SQL_ID BIND_DATA FROM V$SQL WHERE SQL_TEXT= SELECT COUNT( ) FROM TEST WHERE LINE=:LINE ;

　　SQL_ID BIND_DATA

　　abhf n xqgrr BEDA A C EB C C

　　SQL> SELECT VALUE_STRING FROM TABLE(DBMS_SQLTUNE EXTRACT_BINDS( BEDA A C EB C C ));

　　VALUE_STRING

　　SQL> SELECT * FROM TABLE(DBMS_XPLAN DISPLAY_CURSOR( abhf n xqgrr ));

　　PLAN_TABLE_OUTPUT

　　SQL_ID abhf n xqgrr child number

　　SELECT COUNT( ) FROM TEST WHERE LINE=:LINE

　　Plan hash value:

　　|* | INDEX FAST FULL SCAN| IDX_TEST_ | K| K| |

　　Predicate Information (identified by operation id):

　　 filter( LINE =:LINE)

　　Note

　　 cpu costing is off (consider enabling it)

　　 rows selected

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> ALTER SYSTEM FLUSH SHARED_POOL;

　　System altered

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> SELECT SQL_ID BIND_DATA FROM V$SQL WHERE SQL_TEXT= SELECT COUNT( ) FROM TEST WHERE LINE=:LINE ;

　　SQL_ID BIND_DATA

　　abhf n xqgrr BEDA A C ECC C C

　　SQL> SELECT VALUE_STRING FROM TABLE(DBMS_SQLTUNE EXTRACT_BINDS( BEDA A C ECC C C ));

　　VALUE_STRING

　　SQL> PRINT:

　　LINE

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> SELECT SQL_ID BIND_DATA FROM V$SQL WHERE SQL_TEXT= SELECT COUNT( ) FROM TEST WHERE LINE=:LINE ;

　　SQL_ID BIND_DATA

　　abhf n xqgrr BEDA A C ECC C C

　　SQL> SELECT VALUE_STRING FROM TABLE(DBMS_SQLTUNE EXTRACT_BINDS( BEDA A C ECC C C ));

　　VALUE_STRING

　　对于随后的绑定变量的捕获 ORACLE将放在V$SQL_BIND_CATPURE里默认每隔秒捕获一次捕获间隔受隐含参数_cursor_bind_capture_interval的控制

　　为了演示的方便我们把这个间隔设小一点

　　SQL> alter system set _cursor_bind_capture_interval = ;

　　System altered

　　SQL> exec :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT COUNT( ) FROM TEST WHERE LINE=:LINE;

　　COUNT( )

　　SQL> SELECT VALUE_STRING FROM V$SQL_BIND_CAPTURE WHERE SQL_ID= abhf n xqgrr ;

　　VALUE_STRING

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT VALUE_STRING FROM V$SQL_BIND_CAPTURE WHERE SQL_ID= abhf n xqgrr ;

　　VALUE_STRING

　　SQL> SELECT VALUE_STRING FROM V$SQL_BIND_CAPTURE WHERE SQL_ID= abhf n xqgrr ;

　　VALUE_STRING

　　SQL> EXEC :LINE:= ;

　　PL/SQL procedure successfully pleted

　　SQL> SELECT VALUE_STRING FROM V$SQL_BIND_CAPTURE WHERE SQL_ID= abhf n xqgrr ;

　　VALUE_STRING

cha138/Article/program/Oracle/201311/18232

知识大全 绑定变量的获取

知识大全绑定变量的获取