WORDPRESS MYSQL DEADLOCK INSTALL
WORDPRESS MYSQL DEADLOCK PASSWORD

One can also enable the performance_schema by running SQL queries after MySQL is up and running. Setting the performance_schema directives in the mn.cnf file will ensure that the performance_schema is enabled at startup. Therefore be careful when enabling the performance schema in a production environment as it can add a significant amount of overhead. Percona has a good write up on the performance impact of enabling the Performance Schema. Possible reasons why enabling the performance schema is a bad thing includes performance impact on the server. The performance schema can be enabled through several different methods. However, the performance schema is not enabled by default. The MySQL Performance Schema is an extremely valuable feature in MySQL 5.6 for finding queries which have a performance impact on the database. Scan count 1, logical reads 4, physical reads 0, They replied saying that the query was generated by an Microsoft Access database and they had refactored the query, removing the extra parentheses. I gathered the following information and forwarded it to the customer. Scan count 0, logical reads 0, physical reads 0, Read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Scan count 9, logical reads 207651, physical reads 0, SELECT table1.brcd, table2.Pkt_x, table2.PKT_NBRįROM table1 WITH(NOLOCK) INNER JOIN table2 WITH(NOLOCK) ON table1.PKT_NB = table2.PKT_NB Upon removing these parentheses the query went from 207,651 logical reads to 4. In addition, I noticed that there were extra parentheses around the filters in the WHERE clause.

I thought this was interesting in that the query seemed to be very selective with the WHERE clause placed on it. Each time the query below ran it was performing 207,651 logical reads on the server. The query below quickly caught my attention. I logged in and looked at the query plan cache to see which queries were causing load on the server. I had received a high CPU alert from the SQL SERVER 2008 server.

The deadlock graph is viewable under the Deadlock tab:Ī SQL Server Agent alert could be considered to enabled alerts when deadlock thresholds are met of Deadlocks/sec|Database|>|0′), but we use an outside monitoring tool for our notifications.Recently I encountered an interesting issue with the SQL SERVER query engine.

Field: Name, Value: xml_deadlock_report.

Click “Filters” on the Extended Events toolbar, and filter for:.

Right click on package0.event_file, choose “View Target Data…”.

In SQL Server Management Studio, expand Management –> Extended Events –> Sessions –> system_health.

An extended event specific to capture xml_deadlock_report specifically can be created to have a longer history. On the SQL Server side, deadlocks (xml_deadlock_report) may be captured in the Extended Events system_health session(2012+), but depending on the volume of events, these could be overwritten.

We have an additional user created with permissions to read the deadlocks table.

WORDPRESS MYSQL DEADLOCK INSTALL

Install the plugins using your standard process.

The pmp-check-mysql-deadlocks Nagios plugin from Percona Monitoring Plugins to send the team a Nagios alert if a deadlock occurs.

I have scripted this out to check the daemon is running.

–create-dest-table is optional (if you’ve already created the table!).

–run-time 5m – This will run the tool in Daemon mode for 5 minutes, then exit.

WORDPRESS MYSQL DEADLOCK PASSWORD

–ask-pass will cause a prompt for the password to be entered twice, password will not be visible in process list.Pt-deadlock-logger h=,u=perconaadm -ask-pass -dest D=percona,t=deadlocks -create-dest-table -daemonize -interval 60s The below block will create the adlocks table if it does not exist, and run the logger in daemon mode, checking every 60 seconds.

For the initial setup, I create a new tools database & tools user for this setup.Install the toolkit using your standard process.The Deadlock Logger from the Percona Toolkit to capture deadlocks on a regular basis and log them to a table within my database.To address this, I use a combination of tools from Percona: Downside is that depending on the volume of your deadlocks, that gives you no history. On the MySQL side, the most recent deadlock can be viewed using SHOW ENGINE INNODB STATUS. Going over the training and some recent patching of my MySQL environment has reaffirmed a that there is overlap between SQL Server & MySQL, even if the tools may vary. The last few months I’ve been taking a number of online & in person SQL Server training classes & meetups, living in New England there are several options within a couple of hours drive to attend SQL Saturdays.

Wordpress mysql deadlock