| Bug #120797 | Poor plan for DISTINCT Cartesian product: hash join materializes full product while NO_BNL is about 50x faster | ||
|---|---|---|---|
| Submitted: | 27 Jun 15:18 | Modified: | 2 Jul 13:29 |
| Reporter: | ZHAOYANG ZHANG | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S5 (Performance) |
| Version: | 9.7.1 | OS: | Ubuntu (22.04.4 LTS) |
| Assigned to: | CPU Architecture: | x86 | |
| Tags: | cartesian product, cost, distinct, hash join, NO_BNL, Optimizer hints | ||
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
[27 Jun 15:18]
ZHAOYANG ZHANG
