Bug #90693 SELECT..FOR UPDATE does not lock rows from derived tables (subqueries)
Submitted: 30 Apr 2018 14:49 Modified: 13 Jun 2018 16:08
Reporter: Mike Bayer Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: Documentation Severity:S3 (Non-critical)
Version:5.7 OS:Any
Assigned to: 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: