mysql text sizes vlasits read the included SO post for details 1 all text types including tinytext are stored as objects outside the row which is one overhead 2 These objects are then referenced by addresses 8 or 16 bytes so no matter how tiny your tinytext is you are adding unnecessary overheads that too for a max size of 255 bytes it is clear that varchar should be
In case someone else is grappling with this in the future I thought I d note the text types in MySQL and their maximum sizes for reference TINYTEXT 256 bytes TEXT 65 535 bytes 64kb MEDIUMTEXT 16 777 215 bytes 16MB LONGTEXT 4 294 967 295 bytes 4GB The maximum length of a mediumtext field in MySQL is A string with a maximum length of 16 777 215 characters Or according to the docs L 3 bytes where L 2 24 Edited to change to Community Wiki since I d feel bad earning
mysql text sizes
mysql text sizes
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The storage is defined in terms of bytes not characters while each latin characters only use 1 byte other characters can consume 1 to 4 bytes What is the default size of text in MySQL Default size of TEXT datatype column is equal to the size of the default value for this column If default value is not defined then NULL is assigned which Additional You can get size of the mysql databases as following SELECT table schema DB Name Round Sum data length index length 1024 1024 1 DB Size in MB FROM information schema tables GROUP BY table schema ORDER BY DB Size in MB DESC Result DB Name DB Size in MB
Well there s a little bit of rounding up of space because the space is allocated in whole 16KB pages up to half a MB then 1MB at a time for BLOB TEXT documents over one half MB But I wouldn t worry about this All the variable length data types in MySQL work this way VARCHAR VARBINARY TEXT BLOB and all the different types of TEXT and 2 MySQL stores BLOB data including TEXT and LONGTEXT inline and prefixes it with a byte count TEXT stores that count in a two byte prefix so it can store up to 2 16 2 bytes of information LONGTEXT stores the count in a four byte prefix so it can store up to 2 32 4 bytes of information Storing the fields as LONGTEXT wouldn t
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There s one possible performance impact in MySQL temporary tables and MEMORY tables store a VARCHAR column as a fixed length column padded out to its maximum length If you design VARCHAR columns much larger than the greatest size you need you will consume more memory than you have to This affects cache efficiency sorting speed etc MySQL currently i e version 5 6 only supports the Unicode Basic Multilingual Plane characters for which UTF 8 needs up to 3 bytes per character That means the current answer to your question is that your TEXT field can hold at least 21 844 characters Depending on how you look at it the actual limits are higher or lower than that If you
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mysql text sizes - Well there s a little bit of rounding up of space because the space is allocated in whole 16KB pages up to half a MB then 1MB at a time for BLOB TEXT documents over one half MB But I wouldn t worry about this All the variable length data types in MySQL work this way VARCHAR VARBINARY TEXT BLOB and all the different types of TEXT and