1. 简单的SQL容易使用到MySQL的QUERY CACHE; 2. 减少锁表时间特别是使用MyISAM存储引擎的表; 3. 可以使用多核CPU。 truncate代替delete 当删除全表中记录时,使用delete语句的操作会被记录到undo块中,删除记录也记录binlog,当确认需要删除全表时,会产生很大量的binlog并占用大量的undo数据块,此时既没有很好的效率...
truncate table table_name; set FOREIGN_KEY_CHECKS=1; (2) 使用delete from table_name 2.DRDS中不能进行全表扫描 解决方法: delete from table_name where 1=1; 3.主从复制导入数据时 防止生成binlog: set @@session.sql_log_bin=OFF;source *.sql 4.安装gcc时出现glibc版本冲突的问题 CentOS6.5 的机...
SQL INSERT INTO Statement WHERE Clause in SQL SQL UPDATE Query Delete Query in SQL DELETE Query and TRUNCATE Function in SQL LIKE and BETWEEN Operators in SQL SQL BETWEEN Operator(With Syntax and Examples) How to Use the SQL EXISTS to Check for the Existence of Data?
同时也就是我们在执行完grant create on schema to 用户;用户本身就可以具有在这个SCHEMA下拥有的所有的OBJECT 的处理权限,包含对表的insert, select, update ,delete truncate 等权利。 1 dbowner 可以认为是创建这个OBJECT的初创者,在没有复制权限的过程中,除了SUPERUSER 可以操作OBJECT ,dbowner 本身也可以操作他创...
On the Define Shrink Database Task page, create a task that attempts to reduce the size of the selected databases by using the DBCC SHRINKDATABASE statement, with either the NOTRUNCATE or TRUNCATEONLY option. For more information, see DBCC SHRINKDATABASE (Transact-SQL). When complete, select ...
TruncateTargetTableSwitchOption TryCastCall TryCatchStatement TryConvertCall TryParseCall TSEqualCall TSql100Parser TSql110Parser TSql120Parser TSql130Parser TSql140Parser TSql150Parser TSql160Parser TSql80Parser TSql90Parser TSqlAuditEventGroupHelper TSqlAuditEventTypeHelper TSqlBatch TSql...
Execute the following Transact-SQL in Microsoft SQL Server Management Studio (SSMS): SQL Copy TRUNCATE TABLE TestDatabase.dbo.myChar; -- for testing BULK INSERT TestDatabase.dbo.myChar FROM 'D:\BCP\myChar.bcp' WITH ( FORMATFILE = 'D:\BCP\myChar.fmt' ); -- review results SELECT *...
When converting back to the original data type, you will need to truncate these padding characters. You can perform this operation easily using the CAST and SUBSTRING functions. To persist a unique identifier variable you should do an explicit cast o...
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Use the same company name as the one that you deleted in step 7. After the company is created, the tables must be truncated. If you're using Microsoft SQL Server, run the following Truncate_Table_Company.sq...