MySQL crash-safe replication is an old feature (~4 years as of MySQL 5.6), but it’s not consistently understood or applied. The MySQL manual on the topic, 16.3.2 Handling an Unexpected Halt of a Replication Slave, is correct and authoritative, but unless you grok MySQL replication that page doesn’t make it obvious why crash-safe replication works. Other blog posts explain why, but sometimes add other considerations, making it unclear which settings are necessary and sufficient.

As Mydbops we are implementing Load Balancer using Maxscale or ProxySQL ( Our presentation ) for lot our client,  but these load balancers will become a SPOF (Single Point of failure) .  We have tried to explore services like HAProxy, Nginx, and Keepalived etc. Except Keepalived, all the services need to run on the standalone instance and  did not satisfy our exact need.

Keepalived does not requires any standalone instance, it can be deployed and configured with a minimal effort and provide the HA Solutions to the DB Infra. This approach not only fits for our DB setup, we can implement same …

In this blog post, we’ll look at the performance hit from the Spectre bug fix on Ubuntu.

Recently we measured the performance penalty from the Meltdown fix on Ubuntu servers. It turned out to be negligible.

Today, Ubuntu made a Spectre bug fix on Ubuntu available, shipped in kernel 4.4.0-112. As with the Meltdown fix, we measured the effect of this update. Unfortunately, we observed a major performance penalty on MySQL workloads with this new kernel.

Our benchmark used the following:

System:

• CPU:
  • 2 x Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (Codename Haswell)
  • /proc/cpuinfo has 48 …

Join Percona’s Chief Evangelist, Colin Charles as he presents Differences Between MariaDB and MySQL on Wednesday, January 24, 2018, at 7:00 am PST (UTC -8) / 10:00 am EST (UTC -5).

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Tags: MariaDB, MySQL, Percona Server for MySQL, DBA, SysAdmin, DevOps
Experience Level: Novice

MariaDB and MySQL. Are they syntactically similar? Where do these two query languages differ? Why would I use one over the other?

MariaDB is on the path of gradually diverging from MySQL. One obvious example is the internal data …

Once upon a time CPU utilization was quite a useful metric. Following are the output of several tools that provide CPU utilization metrics:

top

top reports a load of 1.66.

Is this correct? No. The correct load number is probably closer to 2.4.

# top -b -n 1| head -20
top - 11:27:45 up 151 days,  1:55,  7 users,  load average: 1.66, 1.84, 1.88
Tasks: 389 total,   3 running, 386 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.7%us, 20.6%sy,  1.2%ni, 77.3%id,  0.1%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:  32639636k total, 32206476k used,   433160k free,   235732k buffers
Swap: 16359420k total, 10285664k used,  6073756k free,  2354840k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
16702 root      20   0 8274m 5.0g 5.0g S 85.1 16.1  59164:55 VirtualBox
 4657 root      20   0  9.8g 5.2g 5.1g S 45.5 16.6  26518:13 VirtualBox
 6239 root      20   0  9.8g 5.1g 5.1g S 39.6 16.5  31200:52 VirtualBox
27070 root …

In this blog post, I’d like to show some relationships of “Group Replication” and “InnoDB Cluster“.  My hope is that I will be able to draw meaningful correlations and attempt to simplify our way of thinking about these setups. The MySQL development team released the first GA release of Group Replication in MySQL 5.7.17, which turns… Read More »

Although it feels like it was only yesterday that Oracle released version 5.7 of their acclaimed MySQL Community Server, version 8 is already available as a development milestone release (DMR). No, you didn’t sleep through a bunch of releases; MySQL is jumping several versions in its numbering due to 6.0 being dropped and 7.0 being reserved for the clustering version of MySQL. This new version boasts numerous changes (and bug fixes), one of the most exciting of which are replication enhancements. This blog will provide an overview of the new replication enhancements, including new replication timestamps, additional information reported by performance schema tables, and how replication delay has been reduced by updating the relationship between replication threads to make them more efficient.

New Replication Timestamps

The most common task when managing a …

The MariaDB project is pleased to announce the immediate availability of MariaDB 5.5.59. This is a stable (GA) release. See the release notes and changelog for details. Download MariaDB 5.5.59 Release Notes Changelog What is MariaDB 5.5? MariaDB APT and YUM Repository Configuration Generator Thanks, and enjoy MariaDB!

The post MariaDB 5.5.59 now available appeared first on MariaDB.org.

Percona announces the release of Percona Monitoring and Management (PMM) 1.6.0. In this release, Percona Monitoring and Management Grafana metrics are available in the Advanced Data Exploration dashboard. We’ve improved the integration with MyRocks, and its data is now collected from SHOW GLOBAL STATUS.

The MongoDB Exporter now features two new metrics: mongodb_up to inform if the MongoDB Server is running and mongodb_scrape_errors_total reporting the total number of errors when scaping MongoDB.

In this release, we’ve greatly improved the performance of the mongodb:metrics monitoring service.

Percona Monitoring and Management (PMM) 1.6.0 also …

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

There is still much going on when it comes to Meltdown/Spectre in our world. Percona’s Vadim Tkachenko and Alexey Stroganov recently published Does the Meltdown Fix Affect Performance for MySQL on Bare Metal?. You also want to read Mark Callaghan’s excellent work on this: Meltdown vs MySQL part 1: in-memory sysbench and a core i3 NUC, XFS, nobarrier and the 4.13 Linux kernel, …