百度文库 其他 在SQL语言中,DELETE和TRUNCATE都属于DML数据操作语句。在SQL语言中,DELETE和TRUNCATE都属于DML数据操作语句。 A. 正确 B. 错误 答案: B©2022 Baidu |由 百度智能云 提供计算服务 | 使用百度前必读 | 文库协议 | 网站地图 | 百度营销 ...
百度试题 题目在SQL语言中,DELETE和TRUNCATE都属于DML数据操作语句。 A. 正确 B. 错误 相关知识点: 试题来源: 解析 B null 反馈 收藏
dropdeletetruncate速度快逐行删除，慢较快类型DDLDMLDDL回滚不可回滚可回滚不可回滚删除内容删除整个表，...
1. Foreground process acquires the "RO" enqueue in exclusive mode 2. Cross instance calls (or one call if it is a single object) are issued ("CI" enqueue is acquired) 3. CKPT processes on each of instances requests the DBWR to write the dirty buffers to the disk and invalidate all th...
SQL> create table test (id number, name varchar2(1)); Table created. SQL> begin for i in 1 .. 10000 loop insert into test values(i, dbms_random.string('a',1)); end loop; commit; end; / PL/SQL procedure successfully completed. ...
dml 操作 申请 表对象TM3,表所在的分区TM3 truncate 表global 维护索引操作,申请 表对象TM3号锁,分区对象TM6号锁 4.上述操作回退,删除其它分区的一条记录; SQL>roll; 对其它分区的数据修改,观察此truncate 及全局维护索引是否有效 selectmin(object_id)fromawhereCREATED>TO_DATE('2013-08-24 00:00:00','YYY...
操作：DELETE 是一种DML（数据操作语言）命令，用于从表中逐行或者批量删除数据。事务：DELETE 可以作为...
(1)); Table created. SQL> begin for i in 1 .. 10000 loop insert into test values(i, dbms_random.string('a',1)); end loop; commit; end; / PL/SQL procedure successfully completed. SQL> create index idx_test on test(id); Index created. SQL> select count(*) from test; COUNT(*...
1. Foreground process acquires the "RO" enqueue in exclusive mode 2. Cross instance calls (or one call if it is a single object) are issued ("CI" enqueue is acquired) 3. CKPT processes on each of instances requests the DBWR to write the dirty buffers to the disk and invalidate all th...
/* DML -- 数据操纵预言: insert/delete/update */ #一: 插入语句 /* 语法1: insert into 表名(列名,..,列名...) values(值1,值2,...),(值1,值2,...),(值1,值2,...); 语法2: insert into 表名