| Bug #38397 | select distinct + order by desc is executed inefficiently | ||
|---|---|---|---|
| Submitted: | 27 Jul 2008 20:13 | Modified: | 28 Jul 2008 3:18 |
| Reporter: | Vladimir Kolesnikov | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S3 (Non-critical) |
| Version: | 5.1.26, 5.0.62 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | DESC, distinct, order by, parser, performance, regression, SELECT | ||
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
