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Re: TINYINT(1) or ENUM( 'true' , 'false')
Posted by: Jay Pipes
Date: February 23, 2006 11:12PM

yoderek wrote:
> Which would be the more optimzed way to store a
> boolean, TINYINT(1) or ENUM( 'true' , 'false')?
> It seems that when storing an enum w/ two settings
> should only take up one bit, 0 or 1, but would
> spend more time looking up the enums in the
> beginning of the query. tinyint(1) however would
> take up 4 bits assuming it ranged 0-9. So it seems
> if you just wanted to fetch the value, tinyint(1)
> would be faster, but if you are searching through
> lots of records enum('true','false') would be
> faster. Do you concur??

TINYINT takes up 1 byte (8 bits) of storage, regardless of whether only 0 and 1 are stored.

ENUM takes up 1 byte of storage, if < 256 elements, 2 bytes of storage for up to 65,535 elements.

You can also check out the BIT data type, which is, I think, what you are looking for:

Jay Pipes
Community Relations Manager, North America, MySQL Inc.

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Written By
February 23, 2006 01:56PM
Re: TINYINT(1) or ENUM( 'true' , 'false')
February 23, 2006 11:12PM

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