title char(20)) ENGINE = INNODB; 修改表存储类型: Alter table tableName engine =engineName 备注:设置完后把以下几个开启: # Uncomment the following if you are using InnoDB tables innodb_
mysql> SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'Total Index Size' FROM TABLES WHERE table_schema = 'mysql' and table_name='user'; +---+ | Total Index Size | +---+ | 0.00 MB | +---+ 1 row in set (0.00 sec) mysql> show create table mysql.use...
TABLES_ROWS:记录数 DATA_LENGTH:数据大小 INDEX_LENGTH:索引大小 其他字段请参考MySQL的手册,查看一个表占用空间的大小,那就相当于是数据大小 + 索引大小 。查看所有库的大小mysql> use information_schema;Reading table information for completion of table and column namesYou...
log_slave_updates 参数控制从库记录回放日志到binlog,MySQL 8.0中将默认值从OFF修改为ON,这里可能会增加IO负载压力。 sql_mode 模式的默认值中去掉了NO_AUTO_CREATE_USER ,MySQL 8.0的默认配置为sql_mode='ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_...
tion. The value of myisam_data_pointer_size can be from 2 to 7. A value of 4 permits tables up to 4GB; a value of 6 permits tables up to 256TB 如果你把max_rows 设为5, 但 myisam_data_pointer_size范围是 2~7, 2个字节就足够了( 2^16=64k), 所以其实就是让myisam是用2个字节的...
(1024*1024*1024),4),'G')AS'Total'FROMinformation_schema.TABLESWHEREtable_schemaLIKE'test';+---+---+---+---+---+|TableName|NumberofRows|Data Size|IndexSize|Total|+---+---+---+---+---+|test.a_br|0.4625M|0.0259G|0.0171G|0.0431G||test.a_skuclr|0.7099M|0.0660G|0.0259G|0....
MySQL has no limit on the number of tables. The underlying file systemmay have a limit on the number of files that represent tables.Individual storage engines may impose engine-specific constraints.InnoDB permits up to 4 billion tables.For information about the physical representation of a table,...
MySQL: size of your tables – tricks and tips Edwin Desouza September 18, 2018 02:07PM Sorry, you can't reply to this topic. It has been closed.Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not...
内存申请时多分配了一块ut_new_pfx_t数据(开启PFS_MEMORY),其中保存了key、size、owner等信息 // 比实际申请多出一块pfx的内存total_bytes+=sizeof(ut_new_pfx_t)// 申请内存...// 返回实际内存开始的地址return (reinterpret_cast<pointer>(pfx + 1)); ...
To change the default size limit forMyISAMtables, set themyisam_data_pointer_size, which sets the number of bytes used for internal row pointers. The value is used to set the pointer size for new tables if you do not specify theMAX_ROWSoption. The value ofmyisam_data_pointer_sizecan ...