Overview The Skinny

In this blog post, we explore the correct way to implement bi-directional Tungsten Replication between AWS Aurora and Tungsten Clustering for MySQL databases.

Background The Story

When we are approached by a prospect interested in using our solutions, we are proud of our pre-sales process by which that we engage at a very deep technical level to ensure the we provide the best possible solution to meet with the prospect’s requirements. This involves an in-depth hands-on POC, in addition to the significant time and effort we spend building and testing the solution architectures in our lab environment as part of the proposal process.

From time to time, we are presented with requirements that are not always quite so straight forward. Just recently we faced such a situation. A …

The Question Recently, a customer asked us:

After importing a new section of user data into our Tungsten cluster, we are seeing perpetually rising replication lag. We are sitting at 8.5hrs estimated convergence time after importing around 50 million rows and this lag is climbing continuously. We are currently migrating some of our users from a NoSQL database into our Tungsten cluster. We have a procedure to write out a bunch of CSV files after translating our old data into columns and then we recursively send them to the write master using the mysql client. Specifically our import SQL is doing LOAD DATA LOCAL INFILE and the reading in a large CSV file to do the import. We have 20k records per CSV file and we have 12 workers which insert them in parallel.

Simple Overview The Skinny

In cases like this, the slaves are having trouble with the database unable to keep up with the apply stage …

Overview The Skinny

In this blog post we will discuss how to use the Tungsten Connector keep-alive feature to ensure long-running MySQL & MariaDB/Percona Server client sessions stay connected in a Tungsten Cluster.

Agenda What’s Here?

• Briefly explore how the Tungsten Connector works
• Describe the Connector keep-alives – what are they and why do we use them?
• Discuss why the keep-alive feature is not available in Bridge mode and why
• Examine how to tune the keep-alive feature in the Tungsten Connector

Tungsten Connector: A Primer A Very Brief Summary

The Tungsten Connector is an intelligent MySQL database proxy located between the clients and the database servers, providing a single connection point, while routing queries to …

In my previous article about roles I said that one of the problems with role usage is that roles need to be activated before they kick in. Let's recap briefly what the problem is:

## new session, as user `root`

mysql [localhost] {root} ((none)) > create role viewer;
Query OK, 0 rows affected (0.01 sec)

mysql [localhost] {root} ((none)) > grant select on *.* to viewer;
Query OK, 0 rows affected (0.01 sec)

mysql [localhost] {root} ((none)) > create user see_it_all identified by 'msandbox';
Query OK, 0 rows affected (0.01 sec)

mysql [localhost] {root} ((none)) > grant viewer to see_it_all;
Query OK, 0 rows affected (0.01 sec)

## NEW session, as user `see_it_all`

mysql [localhost] {see_it_all} ((none)) > use test
ERROR 1044 (42000): Access denied for user 'see_it_all'@'%' to database 'test'

mysql [localhost] {see_it_all} ((none)) > show grants\G …

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 …

The call for participation at Percona Live MySQL Conference and Expo 2014 is now closed. There have been more than 320 submissions, and this will keep the review committee busy for a while.

One important point for everyone who has submitted: if you have submitted a proposal but haven’t included a bio in your account, do it now. If you don’t, your chances of being taken seriously are greatly reduced. To add a bio, go to your account page and fill in the Biography field. Including a picture is not mandatory, but it will be definitely appreciated.

Although the CfP is closed for tutorials and regular sessions, your chances of becoming a celebrity are not over yet. The CfP is still …

Join us for a live webinar and download a new whitepaper where we discuss how to realize new value from data collected during web session management.

Session management has long been a key component of any web infrastructure – enhancing the user browsing experience through improved reliability, reduced latency and tighter security.

Increasingly organizations are looking to unlock more value from session management to further improve user loyalty (i.e. making the web service more “sticky”) and improve monetization of web services.  There are two distinct developments that offer the promise of unlocking more value from session data:
1.    Provide highly personalized browsing experiences by …

It was fun doing the MySQL University session on OQGRAPH yesterday. Now also available: slides (PDF) and audio/video recording (FLV download, if anyone can convert to a more open format, that’d be great).

In addition to being …

In addition to being …