Welcome to the final blog in Windows PerfCounters and Powershell series and sorry for the delay. The purpose of this blog is to explain the inner workings of top-script.ps1 script and practical usage of Performance counters on Windows through Powershell. It is intended for people who want Linux top - like tool on Windows.

The script is a part of and available in our existing benchmarking package (dbt2-0.37.50.10) developed by Mikael Ronstrom.

On Top:If you ever did benchmarking on Linux or simply wondered "where did all my resources go", top is your best friend. Since this post is not about Linux, you can google "Linux top explained" for more details.


On Performance counters:To learn about Windows PerfCounters, please refer to my previous …

In Laravel 5 REST API project sometime we need to create create our own custom header for security like Xhardik123456 this was example that means in your current project your every request with pass your own custom header like i give you examplethis custom header can improve your securit

Join us on February 2nd for this new webinar on Managing MySQL Replication for High Availability led by Krzysztof Książek, Senior Support Engineer at Severalnines. This is part of our ongoing ‘Become a MySQL DBA’ series.

Deploying a MySQL Replication topology is only the beginning of your journey. Maintaining it also involves topology changes, managing slave lag, promoting slaves, repairing replication issues, fixing broken nodes, managing schema changes and scheduling backups. Multi-datacenter replication also adds another dimension of complexity. It is always good to be prepared up front and know how to deal with these cases.

In this webinar we will cover deployment and management of MySQL replication topologies using ClusterControl, show how to schedule backups, promote …

New SSL alternatives SSL connections in previous versions of MariaDB Connector/C are based on the OpenSSL library. But because of the OpenSSL heartbleed bug, licensing problems and the lack of support for different transport layers, we decided to add support for alternative SSL implementations. That’s why Connector/C 3.0 can use not only OpenSSL, but also […]

The post What’s new in MariaDB Connector/C 3.0 – Part I: SSL appeared first on MariaDB.org.

Inspired by Peter Zaitsev’s post for MySQL 5.6, I decided to do a comparison between default configuration of MySQL 5.6 and 5.7. And I gotta tell you, some of the changes I found will have a huge impact on performance so make sure to get yourself familiar with them before you upgrade, even if you’re not otherwise running with a default configuration.

BEGIN

Interestingly, I hit the first roadblock before I could even start. It seems you can no longer extract the same information from the information_schema as in MySQL 5.6, and I had to use performance_schema instead:

mysql> insert into compare.vars57 (variable_name, variable_value) 
   ->  select VARIABLE_NAME, VARIABLE_VALUE from INFORMATION_SCHEMA.GLOBAL_VARIABLES;
ERROR 3167 (HY000): The …

A question raised by my previous post is : What about MariaDB and native JSON support ? In my previous post I mentioned the possibility to use the MariaDB CONNECT storage Engine to store and access JSON content in normal text field. Of course having a native JSON datatype brings more value. It introduces JSON ...continue reading "MariaDB and Native JSON support ?"

Whenever you need to use GROUPCONCAT with differente separatorI mean default separator is But you want to change etc as you want then you have to use use SEPARATOR keyword in GROUPCONCAT If you are working on laravel then you have to also use DBraw for write GROUPCONCA

Data corruption! It can happen. Maybe because of a bug or storage problem that you didn’t expect, or MySQL crashes when a page checksum’s result is different from what it expected. Either way, corrupted data can and does occur. What do you do then?

Let’s look at the following example and see what can be done when you face this situation.

We have some valuable data:

> select * from t limit 4;
+---+--------+
| i | c      |
+---+--------+
| 1 | Miguel |
| 2 | Angel  |
| 3 | Miguel |
| 4 | Angel  |
+---+--------+
> select count(*) from t;
+----------+
| count(*) |
+----------+
|  2097152 |
+----------+

One day the query you usually run fails and your application stops working. Even worse, it causes the crash already mentioned:

> select * from t where i=2097151;
ERROR 2006 (HY000): MySQL server has gone away

Usually this is the point when panic starts. The error log shows: …

The “CAP theorem” is often presented as something deep and hard to understand, and then discussed in confusing terms, to make sure it is hard to understand.  Really, it’s almost common sense – eg, if you have a partition, you have to give up availability or consistency.  Anyone familiar with, eg, drbd/split-brain/STONITH knows all about this.

I was reading a bit about it (again), and I use the sneer quotes on “theorem” because I think that the “proof” is really just adding some mathematical terms to the mix and restating it – QED.  (If this is considered the proof – “Brewer’s Conjecture and the Feasibility of Consistent, Available, Partition-Tolerant Web Services” .)  “Conjecture” doesn’t seem right either.  Maybe CAP observation?

It’s refreshing to …

The details and examples of Schemaless triggers, a key feature of the datastore that’s kept Uber Engineering scaling since October 2014. This is the third installment of a three-part series on Schemaless; the first part is a design overview…

The post Using Triggers On Schemaless, Uber Engineering’s Datastore Using MySQL appeared first on Uber Engineering Blog.