使用Page Compression页面压缩,可以支持多种压缩算法。相比之下,行格式压缩COMPRESSED Row Format,zlib是唯一支持的压缩算法。 综上所述,页面压缩Page Compression要优于行格式压缩COMPRESSED Row Format。 开启t1表页面压缩,命令如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SETG
However, the server-wide InnoDB page compression algorithm can be configured by setting the innodb_compression_algorithm system variable.When this system variable is changed, the InnoDB page compression algorithm does not change for existing pages that were already compressed with a different InnoDB ...
innodb_compression_algorithmDescription: Compression algorithm used for InnoDB page compression. The supported values are: none: Pages are not compressed. zlib: Pages are compressed using the bundled zlib compression algorithm. lz4: Pages are compressed using the lz4 compression algorithm. lzo: ...
MySQL implements compression with the help of the well-knownzlib library, which implementsthe LZ77 compression algorithm. This compression algorithm is mature【məˈtʃʊr 成熟;充分发展;酿成;有判断力】, robust【roʊˈbʌst 强健的;坚固的;强劲的;耐用的;结实的;强壮的;坚定的;富有活力的...
• The default uncompressed size of InnoDB data pages is 16KB. Depending on the combination of option values, MySQL uses a page size of 1KB, 2KB, 4KB, 8KB, or 16KB for the tablespace data file (.ibd file). The actual compression algorithm is not affected by the KEY_BLOCK_SIZE value...
FIL_PAGE_ALGORITHM_V1 1 使用的压缩算法 FIL_PAGE_ORIGINAL_TYPE_V1 2 压缩前的Page类型,解压后需要恢复回去 FIL_PAGE_ORIGINAL_SIZE_V1 2 未压缩时去除FIL_PAGE_DATA后的数据长度 FIL_PAGE_COMPRESS_SIZE_V1 2 压缩后的长度 打洞后的page其实际存储空间需要是磁盘的block size的整数倍。
This is because inside InnoDB COMPRESSION is a page level attribute. The Implication is that a tablespace can contain pages that could be a mix of any supported compression algorithm. If you want to force the conversion of every page then you need to force it by invoking: OPTIMIZE TABLE T;...
on a server that does not support the compression algorithm that was used causes an I/O error. Before downgrading to an earlierversion of MySQL that does not support page compression, uncompress the tables that use the page compression feature. To uncompress a table, run ALTER ... ...
*/ /** If page type is FIL_PAGE_COMPRESSED then the 8 bytes starting at FIL_PAGE_FILE_FLUSH_LSN are broken down as follows: */ /** Control information version format (u8) */ static const ulint FIL_PAGE_VERSION = FIL_PAGE_FILE_FLUSH_LSN; /** Compression algorithm (u8) */ static...
对于常规表空间和mysql系统表空间,这是一个ALGORITHM = INPLACE操作,它不需要重建驻留在该表空间中的表。 如果同时使用COMPRESSION和ENCRYPTION选项创建表,则在对表空间数据进行加密之前执行压缩。 如果密钥环数据文件(由keyring_file_data或keyring_encrypted_file_data命名的文件)为空或丢失,则首次执行ALTER INSTANCE ...