MySQL Bugs: #112767: SELECT COUNT(*) degraded performance on 8.0 compared to 5.7

Bug #112767	SELECT COUNT(*) degraded performance on 8.0 compared to 5.7
Submitted:	19 Oct 2023 6:07	Modified:	16 Feb 2024 22:07
Reporter:	Aristotle Po	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S5 (Performance)
Version:	8.0.34, 8.0.35	OS:	Any
Assigned to:		CPU Architecture:	Any

File:	Maximum allowed size is 50MB.
Description:
Privacy:

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

my.cnf and global variables

Attachment: bug112767-my-cnf-5.7.txt (text/plain), 882 bytes.

5.7 and 8.0 my.cnf and global variables in a zip file.

Attachment: my-cnf-and-global-variables.zip (application/zip, text), 22.71 KiB.

Test results - 8.0.11+, 5.7.44

Attachment: 112767_5.7_8.0.results (application/octet-stream, text), 24.49 KiB.