Home Database Mysql Tutorial Oracle 11gr2新增APPEND_VALUES提示

Oracle 11gr2新增APPEND_VALUES提示

Jun 07, 2016 pm 03:10 PM

在11.2中,Oracle新增了APPEND_VALUES提示,使得INSERT INTO VALUES语句也可以使用直接路径插入。

在11.2中,Oracle新增了APPEND_VALUES提示,使得INSERT INTO VALUES语句也可以使用直接路径插入。

例子很简单:
SQL> SELECT * FROM V$VERSION;

BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> CREATE TABLE T_APPEND (ID NUMBER, NAME VARCHAR(30));
表已创建。
SQL> INSERT /+ APPEND(A) / INTO T_APPEND A
2 VALUES (1, ‘ABC’);
已创建 1 行。
SQL> SELECT * FROM T_APPEND;
ID NAME


--------------------------------------------------------------------------------

    1 ABC
SQL> COMMIT;
提交完成。
SQL> INSERT /+ APPEND(A) / INTO T_APPEND A
2 SELECT ROWNUM + 1, TNAME
3 FROM TAB
4 WHERE ROWNUM = 1;
已创建 1 行。
SQL> SELECT * FROM T_APPEND;
SELECT * FROM T_APPEND
*
第 1 行出现错误:
ORA-12838: 无法在并行模式下修改之后读/修改对象

SQL> COMMIT;
提交完成。
对比INSERT INTO VALUES和INSERT INTO SELECT语句后的结果可以清晰的看到,APPEND提示对于INSERT INTO VALUES语句无效,,数据仍然采用常规路径插入。
在11.2中使用APPEND_VALUES提示,才使得单条插入语句真正实现了直接路径方式:
SQL> INSERT /+ APPEND_VALUES(A) / INTO T_APPEND A
2 VALUES (3, ‘APPEND_VALUE’);
已创建 1 行。
SQL> SELECT * FROM T_APPEND;
SELECT * FROM T_APPEND
*
第 1 行出现错误:
ORA-12838: 无法在并行模式下修改之后读/修改对象

SQL> COMMIT;
提交完成。
SQL> SELECT * FROM T_APPEND;
ID NAME

本文永久更新链接地址

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