Bug #54832 Comment for MyISAM says it is a default engine
Submitted: 26 Jun 2010 23:03 Modified: 4 Aug 2010 23:10
Reporter: Elena Stepanova Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: MyISAM storage engine Severity:S3 (Non-critical)
Version:5.5.6-m3 OS:Any
Assigned to: Sergey Vojtovich CPU Architecture:Any

File: Maximum allowed size is 50MB.
Description:
Privacy:

If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

To split a large file: