Recently, we had an issue in our application which is a single page application(SPA). We have all the functionality in a single page and most of the data and view changes happen through ajax requests and iframe page displays.We are using CodeIgniter framework for this application. So sometimes what happened was the user was logged out while accessing the application and this occurred once a while for 1 or 2 users, not a reproducible case one would say.Before starting on the case, I would like to specify the steps which CodeIgniter takes for checking session for any request.Steps:
1. Read session cookie sent from browser.
2. Read session cookie process proceeds with below step checks (If any one step fails below, it results in create one session cookie)
2a. Checks if session cookie is present
2b. Checks if it is a valid session cookie by using it's decryption algorithm check
2c. If  valid session, then check if …

It's migration time. There was another project that I use often and was still in Launchpad. The Sample Employees Database is now on GitHub, under the same license it had before (CC A-SA 3).

Figure 1 - Employees database
This database is interesting because it is not too small (like Sakila) and not too big. It has enough data to allow you to test in a non trivial way.
Installation and testInstalling the database is easy:

$ git clone https://github.com/datacharmer/test_db.git
$ cd test_db
$ mysql < employees.sql
INFO
CREATING DATABASE STRUCTURE
INFO
storage engine: InnoDB
INFO
LOADING departments
INFO
LOADING employees
INFO
LOADING dept_emp
INFO
LOADING dept_manager
INFO
LOADING titles
INFO …

Benchmark for NVMFS (supports atomic writes ,so we can close double-write option on specific MySQL version )

tips: some Flash-based cards could support large block map , the main idea is to avoid fractured page writes.

http://www.vmcd.org/docs/nvmfs_benchmark.pdf

Percona’s CTO Vadim Tkachenko wrote a response to my Galera Snapshot Isolation post last week. I think Tkachenko may have misunderstood some of my results, and I’d like to clear those up now. I’ve ported the MariaDB tests to Percona XtraDB Cluster, and would like to confirm that using exclusive write locks on all reads, as Tkachenko recommends, can recover serializable histories. Finally, we’ll address Percona’s documentation.

I didn’t use the default isolation levels

But there I need to add quite IMPORTANT addition: it may leave data in inconsistent state if you use SPECIAL TYPE of transactions in default isolation levels that Aphyr uses in his test.

My tests did not use the default isolation …

Percona’s CTO Vadim Tkachenko wrote a response to my Galera Snapshot Isolation post last week. I think Tkachenko may have misunderstood some of my results, and I’d like to clear those up now. I’ve ported the MariaDB tests to Percona XtraDB Cluster, and would like to confirm that using exclusive write locks on all reads, as Tkachenko recommends, can recover serializable histories. Finally, we’ll address Percona’s documentation.

I didn’t use the default isolation levels

But there I need to add quite IMPORTANT addition: it may leave data in inconsistent state if you use SPECIAL TYPE of transactions in default isolation levels that Aphyr uses in his test.

My tests did not use the default isolation …

Percona’s CTO Vadim Tkachenko wrote a response to my Galera Snapshot Isolation post last week. I think Tkachenko may have misunderstood some of my results, and I’d like to clear those up now. I’ve ported the MariaDB tests to Percona XtraDB Cluster, and would like to confirm that using exclusive write locks on all reads, as Tkachenko recommends, can recover serializable histories. Finally, we’ll address Percona’s documentation.

I didn’t use the default isolation levels

But there I need to add quite IMPORTANT addition: it may leave data in inconsistent state if you use SPECIAL TYPE of transactions in default isolation levels that Aphyr uses in his test.

My tests did not use the default isolation …

The MySQL Utilities Team is pleased to announce the Beta release of MySQL Utilities. This release includes a number of improvements for usability, stability, and a few enhancements. A complete list of all improvements can be found in our release notes.…

The MySQL Utilities Team is pleased to announce the latest general availability (GA) release of MySQL Utilities. This release includes a number of improvements for usability, stability, and a few enhancements. A complete list of all improvements can be found in our release notes.…

Facebook, with 1.49 billion monthly active users,  is one of the world’s top MySQL users. Simon Martin, a production engineer on Facebook’s MySQL Infrastructure team, has been working with MySQL for most of his career, starting from 2 servers built out of spare parts and moving through to one of the largest deployments in the world.

Simon will be sharing some of the challenges Facebook has tackled as it rolled out semi-synchronous replication across the company’s different services at Percona Live Amsterdam on Sept. 22. His talk is aptly titled, “The highs and lows of semi-synchronous replication.” I sat down, virtually, with Simon the other day. Our conversation is below, but first, as a special reward to my readers, save €20 on your Percona Live registration by entering promo code …

This Log Buffer Edition covers some nifty blog posts from Oracle, SQL Server and MySQL.

Oracle:

• Real Application Testing report On Premise vs. Oracle Public Cloud
• Foreign Keys and Library Cache Locks
• IN/EXISTS bugs by Jonathan Lewis.
• Creating a trace file from EM12c is quite easy and doesn’t require a DBA offering up the world to allow a developer or support person to perform this action.
• Oracle …