How to compute the disk space usage of a row in a mysql innodb table -


i have application inserts many rows in specific innodb table , don't know how compute disk space needed in future.

so given mysql innodb table structure, how can compute disk space cost of row?

  1. tinyint consumes 1 byte, int: 4 bytes, bigint: 8 bytes, text/blob/varchar/varbinary: 2+ average number of bytes, datetime , timestamp: 5 bytes, char takes full length, etc.
  2. add up, based on columns in table.
  3. multiple 3 (for overhead, indexes, btree structure, wasted space, etc, etc). give crude estimate of disk space innodb row.

caveats:

  • the result high or low, simple first guess.
  • a table take minimum of 16kb.
  • an excessive number of secondary indexes lead more space consumed.
  • lots of texts/blobs can lead off-record storage exceed forumla.
  • at point during growth of table, allocation unit switches 16kb 8mb, thereby leading disturbing jumps in size.
  • row_format makes difference. (but compressed unlikely shrink table more 2x.)
  • look ways shrink uuids, ip addresses, etc, save space.
  • don't use utf8 ascii-only char() strings (country_code, hex, etc).

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