17.9.2 InnoDB Page Compression This section provides information about theInnoDBtable compression andInnoDBpage compression features. The page compression feature is also referred to astransparent page compression. Using the compression features ofInnoDB, you can create tables where the data is stored in...
Compressed tables can be created in file-per-table tablespaces or in general tablespaces. Table compression is not available for the InnoDB system tablespace. The system tablespace (space 0, the .ibdata files) can contain user-created tables, but it also contains internal system data, which is ...
The page size is specified through the KEY_BLOCK_SIZE parameter. The different page size means the table must be in its own .ibd file rather than in the system tablespace, which requires enabling the innodb_file_per_table option. The level of compression is the same regardless of the KEY_...
InnoDB table compression and InnoDB page compression features. The page compression feature is also referred to as transparent page compression. Using the compression features of InnoDB, you can create tables where the data is stored in compressed form. Compression can help to improve both raw ...
TPC 压缩( Innodb Transaparent PageIO Compression) 可以使用下面的命令创建 TPC 压缩表: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATETABLETransaction ( idBINARY(16)PRIMARYKEY,...)COMPRESSION=ZLIB|LZ4|NONE; 要使用 TPC 压缩,首先要确认当前的操作系统是否支持空洞特性。通常来说,当前常见的 操...
ALTER TABLE t1 COMPRESSION="zlib";OPTIMIZE TABLE t1;禁用页压缩：ALTER TABLE t1 COMPRESSION="None";OPTIMIZE TABLE t1;2. 页压缩原理 当一个页被写入磁盘时，InnoDB使用指定的压缩算法对该页进行压缩，然后将压缩后的数据写入磁盘，此时打孔机制会将压缩后的页尾空闲块进行释放，以减少磁盘空间占用。如果压缩...
InnoDB 使用 zlib 库实现压缩,该库实现了 LZ77 压缩算法。这种算法在减少数据大小和 CPU 利用方面表现高效,且是无损的,意味着原始数据总是可以从压缩数据中完全恢复。 3. 选择适合的压缩算法 虽然InnoDB 使用固定的压缩算法(zlib),但可以通过调整压缩级别(innodb_compression_level)来平衡压缩率和 CPU 利用率。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 ...
MySQL 的 InnoDB 实现了两种 B-tree 压缩方案。 MySQL Page Compression 我们先来看一下 Page Compression 方案。该方案利用内核的 punching hole 技术,直接在文件中打洞(在文件中间打洞,即删除文件中间的某一段空间,不影响文件后面 page 的偏移)。数据以未压缩的形态写入到内存 page,直到刷盘时才用通用的压缩算...
mysql>CREATETABLEt1 (aINTAUTO_INCREMENTPRIMARYKEY, bBLOBCOLUMN_FORMAT COMPRESSED, KEY (b(20))); ERROR3001(HY000): CompressedBLOB/TEXT/VARCHAR/VARBINARYcolumn'b'usedinkey listisnotallowed 由于大部分用户的引擎还是InnoDB,因此目前该特性仅支持InnoDB表(其实真实原因是笔者在写这个补丁时只对InnoDB比较了解....