Querying An Int Column From Table That Also Stores Blob Column (Performance)

If you select an INT column from a table that also has a medium/large BLOB column (without selecting the BLOB column) will the query take longer than if the BLOB column was not there?

I am wondering if I should move the BLOB column to a separate table. Does the query duration depend mostly on the size (bytes) of a table or is it based mostly on the columns being selected?

I realize there are potentially a number of factors involved but I am asking in general terms.

Answer Answered by Jan Steinman in this comment.

If using innodb and an indexed INT column, I believe that query time is independent of whatever other columns may be in that table.

What will increase query time is if you are using a tool that loads the BLOB when it displays records. Many of them allow you to turn off loading of BLOB and TEXT fields.


Comments loading...
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.