| Bug #50843 | Optimizer ignores clustered index for GROUP BY even when it improves performance | ||
|---|---|---|---|
| Submitted: | 2 Feb 2010 18:12 | Modified: | 20 Jun 2010 22:33 |
| Reporter: | Chris Calender | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S2 (Serious) |
| Version: | 5.1.42 | OS: | Any |
| Assigned to: | Evgeny Potemkin | CPU Architecture: | Any |
| Tags: | clustered index, GROUP BY, Optimizer, regression | ||
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
