554 bytes received via SQL*Net from client 3 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 20 rows processed SQL> select * from larget where t1 is not null order by t1 fetch first 20 rows only; 20 rows selected. Execution Plan --- Plan hash value: 3254405084 -...
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...
when the LIMIT-clause expression in a bulk FETCH statement does not evaluate to a positive number. 在sql语句中,字符数字类型转换错误,无法将字符串转化成有效数字.此错误也可能因为在limit从句表达式中fetch语句无法对应指定数字 ORA-01017: LOGIN_DENIED --拒绝访问 Your program attempts to log on to Orac...
BMS_XPLAN.DISPLAY CURSOR所传入的第一个参数的值可以是SQL ID,也可以是SQL HASH VALUE SQL> select lower(trim(13yfu3wh150aqt!))sql id, trunc(mod (sum((instr(10123456789abedfghikmnpqrstuvwxyz' niintgsett)),level,1))-1)*power(32,1ength(trin( 3yfuswhis0asth nnntsubstr(lower(trim('3yf...
2) Change "AND ROWNUM < x" to " LIMIT x" Note: There is no "AND" before the LIMIT clause. 3) Change SQL%ROWCOUNT with the following constructs For select queries -> FOUND_ROWS() For update/insert/delete -> ROW_COUNT() 4) Change the CREATE PROCEDURE construct ...
oracle中分批提交insert 事务,以防止redo占用太多可以分批提交事务:以下是三种不同的pl/sql体: 1、编写一个简单的PL/SQL块来模拟逐行提交的情况,注意观察执行时间。 我们的目标是将t_ref表中的数据全部插入到t中。 sec@ora10g> set timing on sec@ora10g> DECLARE 2 BEGIN 3 FOR cur IN (SELECT * FROM t...
sql 15:04:42,724 [main] INFO jTPCC : Term-00, 15:04:42,724 [main] INFO jTPCC : Term-00, warehouses=1 15:04:42,724 [main] INFO jTPCC : Term-00, terminals=4 15:04:42,741 [main] INFO jTPCC : Term-00, runMins=2880 15:04:42,741 [main] INFO jTPCC : Term-00, limit...
The FORALL statement sends DML statements from PL/SQL to SQL in batches rather than one at a time. The BULK COLLECT clause returns results from SQL to PL/SQL in batches rather than one at a time. If a query or DML statement affects four or more database rows, then bulk SQL can signi...
当Oracle数据库启动的时候,实例会根据初始化参数 PARALLEL_MIN_SERVERS=n的值来预先分配n个并行服务进程,当一条SQL被CBO判断为需要并行执行时发出SQL的会话进程变成并行协助进程,它按照并行执行度的值来分配进程服务器进程。 首先协调进程会使用ORACLE启动时根据参数: parallel_min_servers=n的值启动相应的并行服务进程,...
Deletes one or more lines of the SQL buffer ("*" indicates the current line). You can omit the space between DEL and n or *, but not between DEL and LAST. Enter DEL with no clauses to delete the current line of the buffer. The buffer has no command history list and does not re...