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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044099 by Neo on Thursday 13th of February 2020 04:44:46 PM
Old 02-13-2020
Thanks for the suggestion.

I was sitting at my desk with another spike occurred and there were no unusual or phantom processes popping up.

MySQL remained at the top of the CPU utilization with, followed by apache2, so I'm starting to believe something is going on with MySQL which is causing the spikes.

Since most of the MySQL tables get mostly reads compared to writes, MyISAM is faster for these "mostly reads", according to what I have read, so I have not changed any off the busy tables to INNODB.

Maybe that is the issue?

But I am hesitant to experiment with changing MYISAM tables to INNODB unless there is clear evidence that altering these tables from MYISAM to INNODB will not create more problems (slowing the DB down), than the 5 or 6 one minute spikes per day.
 

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NDB_SHOW_TABLES 					       MySQL Database System						   NDB_SHOW_TABLES

NAME
ndb_show_tables - display list of NDB tables SYNOPSIS
ndb_show_tables [options] DESCRIPTION
ndb_show_tables displays a list of all NDB database objects in the cluster. By default, this includes not only both user-created tables and NDB system tables, but NDB-specific indexes, internal triggers, and MySQL Cluster Disk Data objects as well. The following table includes options that are specific to the MySQL Cluster native backup restoration program ndb_show_tables. Additional descriptions follow the table. For options common to most MySQL Cluster programs (including ndb_show_tables), see Options Common to MySQL Cluster Programs(1). Table 17.26. ndb_show_tables Options and Variables: MySQL Cluster NDB 7.2 +--------------------------+--------------------------------------+-------------------------------------+ |Format | Description | Added / Removed | +--------------------------+--------------------------------------+-------------------------------------+ | | Specifies the database in which the | | | --database=string, | table is found | All MySQL 5.5 based releases | | | | | | -d | | | +--------------------------+--------------------------------------+-------------------------------------+ | | Number of times to repeat output | | | --loops=#, | | All MySQL 5.5 based releases | | | | | | -l | | | +--------------------------+--------------------------------------+-------------------------------------+ | | Limit output to objects of this type | | | --type=#, | | All MySQL 5.5 based releases | | | | | | -t | | | +--------------------------+--------------------------------------+-------------------------------------+ | | Do not qualify table names | | | --unqualified, | | All MySQL 5.5 based releases | | | | | | -u | | | +--------------------------+--------------------------------------+-------------------------------------+ | | Return output suitable for MySQL | | | --parsable, | LOAD DATA INFILE statement | All MySQL 5.5 based releases | | | | | | -p | | | +--------------------------+--------------------------------------+-------------------------------------+ | | Show table temporary flag | | | --show-temp-status | | All MySQL 5.5 based releases | +--------------------------+--------------------------------------+-------------------------------------+ Usage ndb_show_tables [-c connect_string] o --database, -d Specifies the name of the database in which the tables are found. o --loops, -l Specifies the number of times the utility should execute. This is 1 when this option is not specified, but if you do use the option, you must supply an integer argument for it. o --parsable, -p Using this option causes the output to be in a format suitable for use with LOAD DATA INFILE. o --show-temp-status If specified, this causes temporary tables to be displayed. o --type, -t Can be used to restrict the output to one type of object, specified by an integer type code as shown here: o 1: System table o 2: User-created table o 3: Unique hash index Any other value causes all NDB database objects to be listed (the default). o --unqualified, -u If specified, this causes unqualified object names to be displayed. Note Only user-created MySQL Cluster tables may be accessed from MySQL; system tables such as SYSTAB_0 are not visible to mysqld. However, you can examine the contents of system tables using NDB API applications such as ndb_select_all (see ndb_select_all(1)). 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_SHOW_TABLES
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