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https://dev.mysql.com/doc/refman/8.0/en/string-type-syntax.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. For definitions of binary string columns (BINARY, VARBINARY, and the BLOB types), MySQL interprets length specifications in byte units. Specifying the CHARACTER ...In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE ...
https://dev.mysql.com/doc/refman/8.0/en/glossary.html
BLOB An SQL data type (TINYBLOB, BLOB, MEDIUMBLOB, and LONGBLOB) for objects containing any kind of binary data, of arbitrary size. The techniques for handling BLOBs within a MySQL application vary with each Connector and API. off-page column A ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-transactions.html
Unique key reads have their locks upgraded automatically by NDB to ensure a self-consistent read; BLOB reads also employ extra locking for consistency. NDBCLUSTER stores only part of a column value that uses any of MySQL's BLOB or TEXT data types in ... A number of limitations exist in NDB Cluster with regard to the handling of ...
https://dev.mysql.com/doc/refman/8.0/en/create-table.html
Prior to MySQL 8.0.13, DEFAULT does not apply to the BLOB, TEXT, GEOMETRY, and JSON types. BLOB and TEXT columns also can be indexed, but a prefix length must be given. That is, index entries consist of the first length characters of each column ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-internals.html
The compression of B-tree nodes (of both clustered and secondary indexes) is handled differently from compression of overflow pages used to store long VARCHAR, BLOB, or TEXT columns, as explained in the following sections. Compressing BLOB, VARCHAR, ... This section describes some internal implementation details about compression for InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-row-format.html
Tables that use the REDUNDANT row format store the first 768 bytes of variable-length column values (VARCHAR, VARBINARY, and BLOB and TEXT types) in the index record within the B-tree node, with the remainder stored on overflow pages. This works ...
https://dev.mysql.com/doc/refman/8.0/en/memory-use.html
For each concurrent thread, a table structure, column structures for each column, and a buffer of size 3 * N are allocated (where N is the maximum row length, not counting BLOB columns). A BLOB column requires five to eight bytes plus the length of ... MySQL allocates buffers and caches to improve performance of database ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-page-lru-table.html
The INNODB_BUFFER_PAGE_LRU table provides information about the pages in the InnoDB buffer pool; in particular, how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes full. The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-page-table.html
The INNODB_BUFFER_PAGE table provides information about each page in the InnoDB buffer pool. For related usage information and examples, see Section 17.15.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”. Do not query this table on a ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
As of MySQL 8.0.13, the TempTable storage engine supports storage of binary large object (BLOB) type columns. This enhancement improves performance for queries that use temporary tables containing BLOB data. Previously, temporary tables that ...