SQL> insert into emp1 select * from emp; 传统方式数据 SQL> insert /*+ APPEND */ into emp1 select * from emp; 直接方式数据,必须commit后才能查看数据 【实验】直接路径插入数据 SQL>createtableemp1asselect*fromempwhere1=2; SQL>insertintoemp1select*from emp;conventional传统方式数据 SQL> insert...
A table lock, also called a TM lock, is acquired by a transaction when a table is modified by an INSERT, UPDATE, DELETE, MERGE, SELECT with the FOR UPDATE clause, or LOCK TABLE statement. DML operations require table locks to reserve DML access to the table on behalf of a transaction ...
EXIT WHEN emp_record%NOTFOUND; dbms_ouput.put_line('雇员名:'||emp_record.ename||',雇员工资:'||emp_record.sal); END LOOP; -- 关闭游标 CLOSE emp_cursor; END; 5. 隐式游标 如果在PL/SQL块中使用了SELECT语句进行操作,PL/SQL会隐含处理游标定义,而对于非查询语句,如修改、删除操作,则由ORACLE...
you have seen how multiple rows can be inserted into the same table and how the same rows can be inserted into multiple tables. The next, and final, example of multitable inserts demonstrates how aconditional clausecan be used to direct each row of data generated by the SELECT statement int...
1. explain plan for获取(即PL/SQL中的F5); 2. set autotrace on (跟踪性能统计); 3. statistics_level=all(获取表访问次数); 4. 通过dbms_xplan.display_cursor输入sql_id参数直接获取 5. 10046 trace跟踪 6. awrsqrpt.sql 各自的适用场景:
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sessioncursor其实就是指的跟这个session相对应的server process的PGA里(准确的说是UGA)的一块内存区域(或者说内存结构),它的目的是为了处理且一次只处理一条sql语句。 一个session cursor只能对应一个shared cursor,而一个shared cursor却可能同时对应多个session cursor。
CLAUSE参数(例如:NLS_DATE_FORMAT和NLSDATE_LANGUAGE等)的ALTER SESSION语句将被逐字复制。 该工具不支持迁移命令子句含有变量ALTER SESSION语句。 例如:EXECUTE IMMEDIATE ' alter session ' || command_val || 'parallel ' | type_value. 示例中,command_val是变量,不受DSC支持。支持的语句将被逐字复制到...
bug: 16086769,错误特征:ORA-600 [13011] ORA-600 [13013] when executing a DML if the WHERE clause includes an added column with a default valuebug: 18405192,错误特征:Create Table Fails with ORA-07445 [evaopn3()+135] bug: 20048270,错误特征:ORA-00979: not a GROUP BY expression--12102版...
<clause>1</clause> <where>1</where> <vector> AND [RANDNUM]=(CASE WHEN ([INFERENCE]) THEN 1 ELSE 1/0 END)</vector> <request> <payload> AND [RANDNUM]=(CASE WHEN ([RANDNUM]=[RANDNUM]) THEN [RANDNUM] ELSE 1/0 END )</payload> ...