When a table is in COMPRESSED format, all data written to overflow pages is compressed “as is”; that is, MySQL applies the zlib compression algorithm to the entire data item. Other than the data, compressed overflow pages contain an uncompressed header and trailer comprising a page checksum ...
Table compression is also not available for the InnoDB system tablespace. The system tablespace (space 0, the ibdata* files) can contain user data, but it also contains internal system information, and therefore is never compressed. Thus, compression applies only to tables (and indexes) stored ...
class MySQLTable{public:voidcompressData(){// 压缩逻辑}voiddecompressData(){// 解压缩逻辑}}; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 类图与时序图 以下为实现压缩存储功能的类图与时序图,展示了操作的对象状态。 MySQLTable+compress()+decompress()CompressionAlgorithm+apply() compress()decompress()...
The default uncompressed size ofInnoDBdatapagesis 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 (.ibdfile). The actual compression algorithm is not affected by theKEY_BLOCK_SIZEvalue; the value det...
数据库层实现:alter table tablename COMPRESSION='zlib'即可. mysql支持zlib和lz4两种, 取消的话,设置为None即可. 那么数据库层面具体是怎么实现的呢? 原理分析 我们先来创建一张压缩表和一张非压缩的表. 代码语言:sql AI代码解释 createtablet20240920_compress(idintprimarykey,namevarchar(200))COMPRESSION="zlib...
When a table is inCOMPRESSEDformat, all data written to overflow pages is compressed“as is”; that is, MySQL applies the zlib compression algorithm to the entire data item. Other than the data, compressed overflow pages contain an uncompressed header and trailer comprising a page checksum and ...
connect (name, host_name, user_name, password, db_name [,port_num [,socket [,options [,default_auth [,compression algorithm, [,compression level]]]) name is the name for the connection (for use with the connection, disconnect, and dirty_close commands). This name must not already...
--compression-algorithms=name Use compression algorithm in server/client protocol. Valid values are any combination of 'zstd','zlib','uncompressed'. --zstd-compression-level=# Use this compression level in the client/server protocol, in case --compression-algorithms=zstd. Valid range is between ...
table_option: {AUTOEXTEND_SIZE [=] value| AUTO_INCREMENT [=] value| AVG_ROW_LENGTH [=] value| [DEFAULT] CHARACTER SET [=] charset_name| CHECKSUM [=] {0 | 1}| [DEFAULT] COLLATE [=] collation_name| COMMENT [=] ‘string’| COMPRESSION [=] {‘ZLIB’ | ‘LZ4’ | ‘NONE’}| ...
`status` mediumblob /*!95012 COMPRESSED *//*!95015 ALGORITHM=ZSTD */ COMMENT 'SQL执行的详细结果状态信息', `profile_kb` double DEFAULT NULL COMMENT '存储在NOS上的STRING格式的profile大小,单位是KB', `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '记录插入时间', ...