| Bug #82725 | Extremely slow query when optimizer_switch='derived_merge=ON' | ||
|---|---|---|---|
| Submitted: | 25 Aug 2016 15:55 | Modified: | 14 Sep 2016 6:26 |
| Reporter: | Zaihua Ji | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S5 (Performance) |
| Version: | 5.7.14, 5.7.15 | OS: | CentOS (Linux rda-db-rep.ucar.edu 3.10.0-327.28.2.el7.x86_64 #1 SMP Wed Aug 3 11:11:39 UTC 2016 x86_64 x86_6) |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | derived_merge, optimizer_switch | ||
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
