| Bug #71804 | Unnecessary filesort when joining on unique column using group by. | ||
|---|---|---|---|
| Submitted: | 22 Feb 2014 22:29 | Modified: | 20 Oct 2014 8:53 |
| Reporter: | Jan Filipiak | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S5 (Performance) |
| Version: | 5.6.6 m9, 5.5.32, 5.1.61 | OS: | Any (sqlfiddle.com) |
| Assigned to: | Assigned Account | CPU Architecture: | Any |
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:
- On *nix platforms use the split command e.g.
split -b 50MB <my_large_archive> <my_split_archive_prefix> - On windows use WinZip or a similar utility to split the large file
