MySQL Performance Problems


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The Lounge What is on Your Mind? MySQL Performance Problems
# 8  
Update:

To be clear, the main reasons I put the man page table in a different database was to make the main database smaller (75%) smaller; and so the daily backups are faster and use less resources. These backups take up less disk space on both the main server and the backup server.

From a DB CPU perspective, there is little to no performance difference having one huge database or two smaller ones.
# 9  
Seems like the bulk of this MySQL performance issue is solved (fingers crossed).
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# 10  
Daily backups:

Before moving man pages to new database:

Code:
-rw-r--r-- 1 root root 1292500820 Nov 13 22:31 main_masterdump_2019-11-13-22.sql.gz

After moving man pages to new database:

Code:
-rw-r--r-- 1 root root  449734289 Nov 14 22:30 main_masterdump_2019-11-14-22.sql.gz

Roughly a 65% reduction in the size for full daily backups.
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# 11  
I just completed (for the most part) a database optimization which was slowing the site down.

In a nutshell, when I created some new code to mitigate against Google soft 404 "errors" (slim content) by adding matching man pages to posts with very little content, I used a "real time" FULLTEXT search of over 350K man pages, and this was causing some performance issues.

Plus, my new code worked, and Google search referrals have just about doubled since I created the solution, but the upside/downside was that the site traffic also doubled (which is a good thing) and the new queries were killing performance (a bad thing).

In the final optimization, I preprocessed all these matches and stored the results in the DB (the ids of all the man pages which match the discussion contents) so, the long MySQL queries doing these FULLTEXT NATURAL LANGUAGE searches on the fly were eliminated (right now about 99.5+ are gone, I have about a half a day of processing to get to 99.999 percent.

The performance improvement is remarkable and the site is much faster, and I have earned my black belt (or at least a brown belt) in MySQL performance tuning, after all these years.

Smilie Smilie Smilie Smilie Smilie Smilie
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