Is there a way to monitor MySQL I/O performance in XAMPP?
I am building an application that will interface with the MySQL database and for testing in XAMPP MySQL, I would like to be able to monitor I/O performance.
XAMPP does not have a performance monitoring tool built in for Mysql, since it is a web server and just comes packaged with Mysql when installed. There are a number of free and paid ways to monitor I/O performance for Mysql.
If you are on a linux server you can use iostat, htop, innotop, show innodb engine status and a number of other packages to monitor I/O performance yourself. Here is a Useful link.
Mysql Workbench is free and has a Dashboard where you can see performance.
Monyog is another great tool but is not free and requires some setup. However, the performance monitoring for a DBA is worth the effort, especially if you have dozens of sites.
Related
I'm trying to optimise the Digital Ocean droplet that my Laravel web app is running on, and have noticed that MySQL is constantly using ~50% of its 1GB RAM. By far the most common and well-attested method for decreasing MySQL's memory footprint is to disable its Performance Schema feature by setting performance_schema = 0 in /etc/mysql/my.cnf.
However, no answer I've seen yet makes any mention of what exactly this feature does, why it's enabled by default, and the implications of disabling it. To me it seems too be good to be true, and while I'm all for optimisation, I also don't want to compromise the integrity of my web app's server.
The performance_schema is for monitoring and instrumenting the MySQL Server. Many types of monitoring tools may depend on it. I won't describe the specific events it monitors, because that's in the manual.
You can run MySQL Server without the performance_schema enabled, but monitoring will be compromised. If you disable monitoring, you will not be able to diagnose performance problems or resource usage.
The IT industry is becoming increasingly aware that monitoring is an important feature of servers and infrastructure. I don't think it's a good tradeoff to disable the performance_schema in MySQL Server to gain a mere 512MB of memory. If you are that constrained on memory, then you should reconsider if MySQL Server is the right technology choice for your platform.
We have a 2GB Digital Ocean server, and it is dedicated for a MySQL server of other two PHP servers. we are using Percona MySQL Server 5.6 on this server. We configured MySQL replication and these configuration is working fine
Our issue is sometime our site monitoring tools reporting that some of the URL hosted with this server is down (May be this is happening once in a week or two). When I am checking, I could see that Mysql Master server load is too much high (May be 35 - 40), so the MySQL server was not responded. # that I usually do a MySQl service restart, this restart cause to server load become normal and the sites started working after service restart.
This is a back-end MySQL database server of 20-25 PHP applications (WordPress, Drupal and some custom applications server).
Here are my questions,
Why this server load automatically goes down, after a spikes happens?
Is there any way in which database is causing issues? So that I can identify the application too.
How can I identify the root cause of this issues
Depending upon your working dataset, a 2GB server providing access for 20-25 PHP applications (WordPress, Drupal and some custom applications server) could be the issue.
For example, if you have a 1.4GB buffer pool (assuming all tables are InnnoDB) and 10GB of data, then your various applications could end up competing for resources, such as I/O, buffer pool pages, Adaptive Hash Index, query cache. They could also, assuming caching is used, be invalidating theit caches within a similar timeframe, thus sending expensive queries to the database.
Whilst a load of 50 is something that you would normally want to avoid, the load average is not something that you should concern yourself with if showing in isolation.
The use of the uninterruptible state has since grown in the Linux
kernel, and nowadays includes uninterruptible lock primitives. If the
load average is a measure of demand in terms of running and waiting
threads (and not strictly threads wanting hardware resources), then
they are still working the way we want them to.
http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html
If the issue is happening once per week then it is starting to sound like a batch process, or cache expiration issue - too much happening at once for the resources available.
The best thing to do is to monitor and look for the cause. Since you are already using Percona Server, using PMM should give you the perfect insight to find the cause, although it works with Oracle MySQL, MariaDB, Aurora, etc. You can try a demo to see the insights that you can gain:
https://pmmdemo.percona.com. The software is Open Source and free to use.
You can look in QAN to find the most expensive queries, whilst looking at Prometheus data to give an insight into the host itself. There are some recommendations to get the most from PMM, depending upon your flavour of MySQL.
We are using Percona MySQL 5.6 on Debian 8 for an ecommerce aggregator. For this there is a master backend server doing the whole ETL (processing product feeds from partners) and a slave MySQL server used by the frontend web servers. It's a single product database with about 600GB data.
Both machines have RAID10 with datacenter series SSDs. Master MySQL is a dual Xeon E5 with 128GB RAM and slave is a single Xeon E5 with 64GB RAM. Our problem is, that the ETL is so I/O heavy (with thousands of IOPS), that the master is able to handle the I/O load but the slave server cannot keep up with replication. Most work is done in a ramdisk and only real neccessary data is written to database, already.
The slave has more reads than writes, but replication cannot catch up. What options are there for scaling the replication writes (i.e. the I/O load) on the slave?
Edit 2016-11-18: With "options" I'm not only asking for optimizing MySQL, but for completely other techniques or software which could handle this situation better.
Upgrading to 5.7 should hopefully solve your immediate problem: http://mysqlhighavailability.com/multi-threaded-replication-performance-in-mysql-5-7/.
This is usually a precursor to the master running out of write capacity. You should start thinking about sharding soon. You can check out YouTube's vitess.io project, which I'm part of.
I have a mysql server in linux platform. I need to do performance tuning in that mysql server which is innodb engine.I want know the manual configuration in my.cnf file. so, what are all the important innodb parameters to be configure ? Because innodb and myisam engines are having different tuning operations. please tell some useful things to do
I would recommend using MySQL Tuner
This is good starting point for MySQL performance tuning.
You should also be running some kind of monitoring software that is able to graph
you MySQL health. This is vastly helpful when the performance trouble comes in.
I would recommend you munin with the MySQL plugins.
Regards -- Luke
Does MySql support for cluster environment? Whether Community edition support for clustering?
I want to know more details about it. Please guide me where can I get details?
You can read everything about MySQL Cluster (which is a different version than MySQL Community, but you can get both for free) on the MySQL website:
http://www.mysql.com/products/database/cluster/
MySQL Community edition can be set up to do master-slaves replication, but that's not as cool and effective as what MySQl Cluster can do.
Yes, MySQL Cluster does support clustering. If you have a Amazon EC2 account, I recommend this tool/website for setting up a MySQL Cluster quickly for testing: http://support.severalnines.com/entries/20916823-installing-on-amazon-ec2
MySQL Cluster is apparently the only MySQL solution right now from Oracle (outside of Percona and others) that allows for 99.999% availability (HA).
From my initial tests, MySQL Cluster is really fast at writes, but slightly slower at reads, though it aggressively caches reads after the first read. I'm still studying it myself.
Also, MySQL Cluster community edition should suffice for most use cases. I think the Carrier Grade edition is only for real heavy-duty uses.
You can get straight to the community (GPL) download for MySQL Cluster at http://dev.mysql.com/downloads/cluster/ (or the commercial version from Oracle e-Delivery - the functionality and underlying code base is the same).
An alternative to MySQL Cluster is SchoonerSQL, a cluster based on MySQL but uses the standard InnoDB storage engine rather than NDB. It supports 99.999% availability and has a very simple GUI management console. Go to SchoonerInfoTechcom