MySQL Performance Problems Post: 303041393

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The Lounge What is on Your Mind? MySQL Performance Problems Post 303041393 by Neo on Friday 22nd of November 2019 06:14:47 AM

11-22-2019

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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.

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LEARN ABOUT LINUX

ndb_drop_table

NDB_DROP_TABLE(1)					       MySQL Database System						 NDB_DROP_TABLE(1)

NAME

       ndb_drop_table - drop an NDB table

SYNOPSIS

       ndb_drop_table options

DESCRIPTION

       ndb_drop_table drops the specified NDB table. (If you try to use this on a table created with a storage engine other than NDB, the attempt
       fails with the error 723: No such table exists.) This operation is extremely fast; in some cases, it can be an order of magnitude faster
       than using a MySQL DROP TABLE statement on an NDB table.
	       Usage

	   ndb_drop_table -c connect_string tbl_name -d db_name

       The following table includes options that are specific to ndb_drop_table. Additional descriptions follow the table. For options common to
       most MySQL Cluster programs (including ndb_drop_table), see Options Common to MySQL Cluster Programs(1).

       Table 17.19. ndb_drop_table Options and Variables: MySQL Cluster NDB 7.2
       +--------------------------+-----------------------------------+-------------------------------------+
       |Format			  | Description 		      | Added / Removed 		    |
       +--------------------------+-----------------------------------+-------------------------------------+
       |			  | Name of the database in which the | 				    |
       |       --database=dbname, | table is found		      |        All MySQL 5.5 based releases |
       |			  |				      | 				    |
       |       -d		  |				      | 				    |
       +--------------------------+-----------------------------------+-------------------------------------+

COPYRIGHT

       Copyright (C) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

       This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as
       published by the Free Software Foundation; version 2 of the License.

       This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Oracle Corporation (http://dev.mysql.com/).

MySQL 5.5							    01/30/2014							 NDB_DROP_TABLE(1)