| Bug #49111 | Change in execution plan for count_distinct_group_on_key causes peformance drop | ||
|---|---|---|---|
| Submitted: | 25 Nov 2009 20:11 | Modified: | 30 Aug 2012 14:32 |
| Reporter: | Alexey Stroganov | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S3 (Non-critical) |
| Version: | 5.5.0-beta, 5.1 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | cost model, 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
[25 Nov 2009 20:12]
Alexey Stroganov
[9 Dec 2009 15:15]
Alexey Stroganov
Bigger dataset(10000 rows) for the issue
Attachment: bench1.count.10000.dmp.bz2 (application/x-bzip, text), 29.18 KiB.
