We are using table level compression with the feature of row format. Table size was approx 950GB when using row format dynamic. After altering table to row format compressed, table size went to 350GB. Didn't specify key block size while performing alteration on table for compression. ...
as specified in the CREATE TABLE or ALTER TABLE statement. Table attributes such as ROW_FORMAT and KEY_BLOCK_SIZE are not part of the CREATE INDEX syntax for InnoDB tables, and are ignored if they are specified (although, if specified, they appear in the output of the SHOW...
innodb_file_format = Barracuda --模式支持压缩 innodb_file_per_table = on --必须是独立表空间 压...
and using smaller page sizes. With theCOMPRESSEDrow format, theKEY_BLOCK_SIZEoption controls how much column data is stored in the clustered index, and how much is placed on overflow pages. For more information about theCOMPRESSEDrow format, seeSection 17.9, “InnoDB Table and Page Compression...
AnInnoDBtable created withROW_FORMAT=COMPRESSEDcan use a smallerpage sizeon disk than the configuredinnodb_page_sizevalue. Smaller pages require less I/O to read from and write to disk, which is especially valuable forSSDdevices. The compressed page size is specified through theCREATE TABLEorALTE...
在创建一个压缩的表之前,首先要确保开启了innodb_file_per_table配置参数,并把innodb_file_format设置为Barracuda。你可以在MySQL的配置my.cnf or my.ini里面设置这些参数,或者是通过SET语句来在线设定。 To enable compression for a table, you use the clauses ROW_FORMAT=COMPRESSED, KEY_BLOCK_SIZE, or both...
对于透明页压缩的使用方法,和压缩表格式相同的是,都是通过CREATE TABLE或者ALTER TABLE语法对于一个表使用的。不同点是压缩表格式使用ROW_FORMAT=COMPRESSED这个字段,而透明页压缩使用COMPRESSION=“zlib”、COMPRESSION="lz4"或者COMPRESSION="None"这种字段。分别用两种压缩形式创建一个表的例子: ...
ALTERTABLEexisting_table ROW_FORMAT=COMPRESSED; 1. 三、数据清理和归档 除了压缩,定期清理和归档不再需要的数据也能有效减小数据量。可以定期执行以下 SQL 语句来删除过期的数据: DELETEFROMlogsWHEREcreated_at<NOW()-INTERVAL1YEAR; 1. 四、使用外部工具进行数据压缩 ...
ALTERTABLEcompress_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 ...
CREATETABLE sys_log ( logId BINARY(16) PRIMARY KEY, ...)ROW_FORMAT=COMPRESSEDKEY_BLOCK_SIZE=8COMPRESS 页压缩就是将一个页压缩到指定大小，比如从16K压缩到8K，但是如果无法压缩到8K，则会产生两个8K的页。COMPRESS 页压缩，适合用于一些对性能不敏感的业务表，例如日志表、监控表、告警表等，压缩比例...