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 ...
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 ...
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...
Some of the compression types are: There is usually a different Huffman table for each column. Suffix space compression. Prefix space compression. Numbers with value 0 are stored using 1 bit. If values in an integer column have a small range, the column is stored using the smallest possible...
Database Compression versus Application Compression Decide whether to compress data in your application or in the table; do not use both types of compression for the same data. When you compress the data in the application and store the results in a compressed table, extra space savings are ext...
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’}| ...
--count Show number of rows per table (may be slow for non-MyISAM tables). -C, --compress Use compression in server/client protocol. -#, --debug[=name] Output debug log. Often this is 'd:t:o,filename'. --debug-check Check memory and open file usage at exit. --debug-info Pri...
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 ...
TABLESPACE TABLE_CHECKSUM TABLE_NAME TEMPORARY TEMPTABLE TERMINATED(R) TEXT THAN THEN(R) TIME TIMESTAMP TIMESTAMPADD TIMESTAMPDIFF TINYBLOB(R) TINYINT(R) TINYTEXT(R) TO(R) TRAILING(R) TRANSACTION TRIGGER (R) TRIGGERS TRUE (R) TRUNCATE TYPE TYPES UNCOMMITTED UNDEFINED UNDO(R) UNDOFILE UNDO...
一个表的行格式不仅决定了每行数据在物理上的存储方式,同时也影响了查询和DML语句的执行效率。如果磁盘每一页(默认情况下是16K,可以通过参数innodb_page_size调整页大小)能存储更多行的信息,不仅可以加快查询速度,同时也可以减少更新操作时,磁盘的I/O次数。