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Full Discussion: MySQL Performance Problems
The Lounge What is on Your Mind? MySQL Performance Problems Post 303041393 by Neo on Friday 22nd of November 2019 06:14:47 AM
Old 11-22-2019
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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Session::Store::MySQL(3)				User Contributed Perl Documentation				  Session::Store::MySQL(3)

NAME
Apache::Session::Store::MySQL - Store persistent data in a MySQL database SYNOPSIS
use Apache::Session::Store::MySQL; my $store = new Apache::Session::Store::MySQL; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::MySQL fulfills the storage interface of Apache::Session. Session data is stored in a MySQL database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions', or another table name if you provide the TableName argument: id char(32) # or however long your session IDs are. a_session text To create this schema, you can execute this command using the mysql program: CREATE TABLE sessions ( id char(32) not null primary key, a_session text ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are: DataSource UserName Password TableName Handle Example: tie %hash, 'Apache::Session::MySQL', $id, { DataSource => 'dbi:mysql:database', UserName => 'database_user', Password => 'K00l', TableName => 'sessions' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::MySQL', $id, { Handle => $dbh }; AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org> SEE ALSO
Apache::Session perl v5.12.1 2007-09-28 Session::Store::MySQL(3)
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