-- 插入两条记录,value_list 数量必须和定义表的列的数量及顺序一致 INSERT INTO student VALUES (100, 10000, '唐三藏', NULL); INSERT INTO student VALUES (101, 10001, '孙悟空', '11111'); 1. 2. 3. 多行数据 + 指定列插入 -- 插入两条记录,value_list 数量必须和指定列数量及顺序一致 INSERT...
五、Change Buffer的重要的参数 mysql> show variables like '%innodb_change_buffer%'; +---+---+ | Variable_name | Value | +---+---+ | innodb_change_buffer_max_size | 25 | | innodb_change_buffering | all | +---+---+ 2 rows in set (0.01 sec) 5.1 innodb_change_buffer_max_s...
1846 (0A000): ALGORITHM=INPLACE is not supported.问题现象在RDS MySQL实例中,使用INPLACE方式扩展VARCHAR字段长度时,提示如下错误:ERROR 1846 (0A000):ALGORITHM=INPLACE is not suppor...
Re: How to inter change column value in single query Tom Melly September 15, 2009 05:51AM Re: How to inter change column value in single query mahesh musuram September 15, 2009 06:28AM Sorry, you can't reply to this topic. It has been closed.Content...
在MySQL5.5之前,叫插入缓冲(Insert Buffer),只针对INSERT做了优化;现在对DELETE和UPDATE也有效,叫做写缓冲(Change Buffer)。 它是一种应用在非唯一普通索引页(non-unique secondary index page)不在缓冲池中,对页进行了写操作,并不会立刻将磁盘页加载到缓冲池,而仅仅记录缓冲变更(Buffer Changes),等未来数据被读取...
Parameters with MASTER in their name get an alias that replaces MASTER with SOURCE. If the old terminology is used, deprecation warnings are emitted. # USER/DEV STORIES As a MySQL admin user I want to issue replication commands that do not contain offensive terms so that I do not get ...
常见报错信息:Use of uninitialized value $host in string eq at /usr/local/percona-toolkit-3.0.3/bin/pt-online-schema-change line 4284.sub _find_slaves_by_processlist { my ( $self, $dsn_parser, $dbh, $dsn ) = @_; my @slaves = map { my $slave = $dsn_parser->parse("h=$_",...
The parameter innodb_large_prefix was introduced in MySQL 5.5, so that users could avoid accidentally creating tables that would be incompatible with the InnoDB Plugin in MySQL 5.1. Now that MySQL 5.1 is not supported any more, it makes no sense to use any other value than innodb_large_prefi...
Value Numeric Value Description none0Do not buffer any operations. inserts1Buffer insert operations. deletes2Buffer delete marking operations; strictly speaking, the writes that mark index recordsforlater deletion during a purge operation. changes3Buffer inserts and delete-marking operations. ...
mysql> show variableslike'%change_buffer%';+---+---+| Variable_name| Value|+---+---+| innodb_change_buffer_max_size|25|| innodb_change_buffering|all|+---+---+2 rowsinset (0.01 sec) 1、innodb_change_buffer_max_size:表示change buffer在buffer pool中的最大占比,默认25%,最大50% ...