In this blog post, we will discuss how to deal with jumbo chunks in MongoDB.

You are a MongoDB DBA, and your first task of the day is to remove a shard from your cluster. It sounds scary at first, but you know it is pretty easy. You can do it with a simple command:

db.runCommand( { removeShard: "server1_set6" } )

MongoDB then does its magic. It finds the chunks and databases and balances them across all other servers. You can go to sleep without any worry.

The next morning when you wake up, you check the status of that particular shard and you find the process is stuck:

"msg" : "draining ongoing",
"state" : "ongoing",
"remaining" : {
"chunks" : NumberLong(3),
"dbs" : NumberLong(0)

There are three chunks that for some reason haven’t been migrated, so the

removeShard

A wise man once said that the safest way to store date and time values in MySQL is to store Unix timestamps in an unsigned INT column. I agree with Baron, but most of us have to deal with DATE, DATETIME, and/or TIMESTAMP values sometimes, and it's often useful to know how to convert values from one time zone to another.

The CONVERT_TZ() Function

You can convert a temporal value in MySQL from one time zone to another using the CONVERT_TZ() function. As an example, say I want to watch the Boston Marathon in Melbourne, Australia but I'm afraid it may be on after my bed time. The elite men start at 10:25 AM on April 18, 2016. Boston's time zone will be EDT that day, …

In this blog post we’ll discuss a caveat when downloading MariaDB MaxScale binaries.

Following the previous performance results in my last two posts on sysbench and primary keys (https://www.percona.com/blog/2016/04/07/mysql-5-7-sysbench-oltp-read-results-really-faster/ and https://www.percona.com/blog/2016/03/28/mysql-5-7-primary-key-lookup-results-is-it-really-faster/), I wanted to measure overhead from proxies servers like ProxySQL and MaxScale.

Unfortunately, I found that MaxScale binaries are not available without registering on the …

MySQL 5.7.12 is the fourth stable (GA) release of the MySQL 5.7 series. It brings with it the usual bug fixes and incremental enhancements that you would expect with a point release. Except this time things are a little bit different.…

In a few days, I will be flying to San Francisco and then making my way to Santa Clara to attend the Percona Live Conference.  On the last day of the conference (Thursday), I will speak about MySQL Parallel Replication.  I hope to see you there and I will he happy to answer questions you might have (on this subject and others):

Thursday at 12:50 pm: MySQL Parallel Replication: inventory,

[…] Benchmarks: https://mariadb.org/performance-evaluation-of-mariadb-10-1-and-mysql-5-7-4-labs-tplc/ […]

Here is quick post which can help you to get base url or home page url of your laravel application I think many times we need to get site URL for something share or link so you can get that using url helper and URL facade Both way are same you can use that anywhere i mean in controller or view

Time flies, and my blogging frequency is quite low. More frequent would be better, but knowing myself I'll rather not promise anything ;-)

Still, it is appropriate to write some notes about CeBIT, the "Chemnitzer Linuxtage 2016", and future events.

CeBIT

CeBIT was running from March 14 to 18 (Monday till Friday) in Hannover, Germany, and I will leave the general assessment to the various marketing departments as well as to the regular visitors (to which I do not belong).

In order to meet our current customers as well as potential future ones, FromDual had a booth in the "Open Source Forum". We displayed a Galera Cluster, running on three tiny headless single-board Linux machines, and showed how it reacts to node failures and then recovers all by itself, without any administrator intervention. Many of our visitors were fascinated, because a HA solution would be a …

Network Throttling tool provided by Google Chrome Developer tools
In this video we will be seeing how this tool helps us to test your application at different network speeds, thus giving us info and insight as to how users having different speeds of internet use our application and the challenges they face and how the performance can be improved and how the application can be made more usable in such cases.

In this blog, we will examine the differences between GCache and Record-Set Cache in Percona XtraDB Cluster.

In Percona XtraDB Cluster (PXC), there is the concept of GCache and Record-Set cache (which can also be called transaction write-set cache). The use of these two caches is often confusing if you are running long transactions, as both of them result in the creation of disk-level files. Let’s understand what their main differences are.

Record-Set Cache

• When you run a long-running transaction on any particular node, it will try to append a key for each row that it tries to modify (the key is a unique identifier for the row {db,table,pk.columns}). This information is cached in out-write-set, which is then sent to the group for …