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MySQL Performance Problems

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The Lounge What is on Your Mind? MySQL Performance Problems
# 1  
Old 12-19-2019
FYI:

Code:
mysql> show variables like '%long_quer%';
+-----------------+----------+
| Variable_name   | Value    |
+-----------------+----------+
| long_query_time | 0.400000 |
+-----------------+----------+
1 row in set (0.01 sec)

Code:
ubuntu# mytop

MySQL on localhost (5.7.23)                                                                                                    load 0.97 1.18 1.38 2/1855 6627 up 0+21:55:36 [22:20:02]
 Queries: 29.3M    qps:  389 Slow:     0.0         Se/In/Up/De(%):    71/01/06/00 
 Sorts:    663 qps now:  291 Slow qps: 0.0  Threads:    3 (   1/  13) 71/01/06/00 
 Key Efficiency: 100.0%  Bps in/out: 75.9k/25.1M   Now in/out: 55.3k/19.8M

So, after a sampling of nearly 30M queries over the past day or so, no query was found over 0.40 sec.

Will reduce to 0.2 or 0.3 seconds at a later date (the next time I restart mysql) and test again.
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LEARN ABOUT LINUX

ndb_delete_all

NDB_DELETE_ALL(1)					       MySQL Database System						 NDB_DELETE_ALL(1)

NAME

       ndb_delete_all - delete all rows from an NDB table

SYNOPSIS

       ndb_delete_all options

DESCRIPTION

       ndb_delete_all deletes all rows from the given NDB table. In some cases, this can be much faster than DELETE or even TRUNCATE TABLE.
	       Usage

	   ndb_delete_all -c connect_string tbl_name -d db_name

       This deletes all rows from the table named tbl_name in the database named db_name. It is exactly equivalent to executing TRUNCATE
       db_name.tbl_name in MySQL.

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

       Table 17.16. ndb_delete_all 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		  |				      | 				    |
       +--------------------------+-----------------------------------+-------------------------------------+
       |			  | Perform the delete in a single    | 				    |
       |       --transactional,   | transaction (may run out of       |        All MySQL 5.5 based releases |
       |			  | operations) 		      | 				    |
       |       -t		  |				      | 				    |
       +--------------------------+-----------------------------------+-------------------------------------+
       |			  | Run tup scan		      | 				    |
       |       --tupscan	  |				      |        All MySQL 5.5 based releases |
       +--------------------------+-----------------------------------+-------------------------------------+
       |			  | Run disk scan		      | 				    |
       |       --diskscan	  |				      |        All MySQL 5.5 based releases |
       +--------------------------+-----------------------------------+-------------------------------------+

       o   --transactional, -t

	   Use of this option causes the delete operation to be performed as a single transaction.

	       Warning
	       With very large tables, using this option may cause the number of operations available to the cluster to be exceeded.

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_DELETE_ALL(1)