MySQL index prefix length：Prefix indexes — MySQL for Developers
Prefix indexes — MySQL for Developers
2023年3月9日—Creatingprefixindexes.TocreateaprefixindexinMySQL,youhavetospecifytheprefixlengthyouwanttoindex.Supposewehaveapeople ...。其他文章還包含有：「15.1.15CREATEINDEXStatement」、「EssentialGuidetoMySQLPrefixIndexing」、「MySQL8.4ReferenceManual」、「MySQL9.1ReferenceManual」、「MySQLrequiresprefixlengthforindexesonBLOBTEXT」、「MySQLvarcharindexlength」、「Mysql」、「PrefixIndexesinMyS...
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15.1.15 CREATE INDEX Statement
https://dev.mysql.com
For string columns, indexes can be created that use only the leading part of column values, using col_name ( length ) syntax to specify an index prefix length:.
Essential Guide to MySQL Prefix Indexing
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The optimal prefix length depends on the distribution of values in the column you're indexing.
MySQL 8.4 Reference Manual
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Prefixes can be up to 767 bytes long for InnoDB tables that use the REDUNDANT or COMPACT row format. The prefix length limit is 3072 bytes for InnoDB tables that use the DYNAMIC or COMPRESSED row format. For MyISAM tables, the prefix length limit is 1000
MySQL 9.1 Reference Manual
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Prefixes can be up to 767 bytes long for InnoDB tables that use the REDUNDANT or COMPACT row format. The prefix length limit is 3072 bytes for InnoDB tables ...
MySQL requires prefix length for indexes on BLOBTEXT
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From MySQL documentation: BLOB and TEXT columns also can be indexed, but a prefix length must be given. Example: CREATE UNIQUE INDEX index_name ...
MySQL varchar index length
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By default, an index key for a single-column index can be up to 767 bytes. The same length limit applies to any index key prefix. For example, ...
Mysql
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A prefix index isn't sorted beyond the length of the prefix. If your query uses a full index to find rows, you'll often find that the rows ...
Prefix Indexes in MySQL
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Also, The maximum length of the indexed value is 767 bytes. If the indexed value exceeds this length, it will be truncated. In such cases, the prefix index ...
Understanding Indexes in MySQL
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A prefix can be up to 767 bytes long for InnoDB tables that use the REDUNDANT or COMPACT row format, but for DYNAMIC or COMPRESSED row formats ...