4 tane BLOB tip var. Bunlar şöyle
BLOB A small BLOB
TINYBLOB A very small BLOB (binary large object)
MEDIUMBLOB A medium-sized BLOB
LONGBLOB A large BLOB
Depolama
Açıklaması şöyle. 4 çeşit depolama yöntemi var
DYNAMIC , REDUNDANT , COMPACT , COMPRESSED
Another aspect is the MySQL’s storage row format. Depending on row format, MySQL stores data differently.DYNAMIC row format for BLOB stores 20-byte pointer to where it’s stored. As opposed to REDUNDANT and COMPACT row formats, which store first 768 bytes in a table and the rest in overflow pages. In this benchmark data sizes start from 1028 bytes, so this kind of optimization is irrelevant.COMPRESSED row format enables compression on database level, so 20-byte pointer will point to another storage which will be compressed using deflate with 4-byte length prefix. For the benchmark sake we will use the same algorithm on application level to see the overhead of MySQL over compression. You may find useful another blog post with overview of MySQL compression.
Örnek
Şöyle yaparız
CREATE TABLE `uncompressed_blobs` (`id` INT NOT NULL PRIMARY KEY,`data` MEDIUMBLOB NOT NULL) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;
Açıklaması şöyle
In this table we will store either uncompressed data or data compressed on an application level without using MySQL compression (obviously, we want to avoid double compression as it ineffective).
Örnek
Şöyle yaparız
CREATE TABLE `compressed_blobs` (`id` INT NOT NULL PRIMARY KEY, `data` MEDIUMBLOB NOT NULL ) ENGINE=InnoDB ROW_FORMAT=COMPRESSED;