Written By Posted myisam table compression 2826 Jacky Shu January 09, 2006 01:01PM Re: myisam table compression 1531 Ingo Strüwing January 10, 2006 03:34AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyr...
使用ALTER TABLE将compression设置为None。设置COMPRESSION=None后发生的表空间写入不再使用页压缩。要解压缩现有页面,必须在设置COMPRESSION=None后使用OPTIMIZE table重新生成表。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ALTERTABLEdic_history_202201COMPRESSION="None";OPTIMIZETABLEdic_history_202201; 页压缩...
ALTER TABLEcompress_testROW_FORMAT=COMPRESSEDKEY_BLOCK_SIZE=8; 4、压缩效果 压缩效果通过线上的一个监控的表修改为压缩后的文件大小来说明,压缩前后对比如下: 四、参考文献 https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-background.html https://dev.mysql.com/doc/refman/5.7/en/general-tab...
这几个问题在 MySQL 侧都有很好的解决方案 ,针对第 1 个问题,可以使用 MySQL 的压缩协议解决;针对第 2 个问题,可以采用 MySQL 的压缩和解压函数完美解决;而针对最复杂的第 3 个问题,则可以在引擎层面进行解决,目前 myisam、innodb、tokudb、MyRocks 等引擎都支持表的压缩。本篇文章要详细讨论的就是此类关于 ...
shell> myisampack station.MYI #开始压缩表 Compressing station.MYI: (1192 records) - Calculating statistics normal: 20 empty-space: 16 empty-zero: 12 empty-fill: 11 pre-space: 0 end-space: 12 table-lookups: 5 zero: 7 Original trees: 57 After join: 17 ...
is compressed separately, so there is very little access overhead. The header for a row takes up one to three bytes depending on the biggest row in the table. Each column is compressed differently. There is usually a different Huffman tree for each column. Some of the compression types are...
使用存储引擎:如使用 MyISAM 或 TokuDB 引擎,这些引擎从底层支持数据压缩。 应用级别压缩:在应用层面上,使用数据压缩库将数据压缩后再写入数据库。 二、使用 InnoDB 表压缩 2.1 创建压缩表 在MySQL 中,使用 InnoDB 存储引擎的表可以通过设置ROW_FORMAT=COMPRESSED来实现压缩。以下是创建压缩表的示例: ...
mysql> show table status from kkk like 'frag_tab_myisam' \G; 如下截图所示,如果没有DML操作,Data_free的大小是0 然后我们在数据库上删除掉2条记录,如下所示,Data_free的大小为64KB大小了。 mysql> delete from frag_tab_myisam where id =1; ...
Thetbl_nameargument can be either the name of aMyISAMtable or the name of its index file, as described inSection 6.6.4, “myisamchk — MyISAM Table-Maintenance Utility”. Multipletbl_namearguments can be given. Suppose that a table namedpersonhas the following structure. (TheMAX_ROWStable...
myisam table compressionPosted by: Jacky Shu Date: January 09, 2006 01:01PM Scenario: Huge myisam log table needs compression for maintenance. This table is replicated to several databases. Question: Is there any way that I can compress this table on the master db and it is ...