Random Numbers

Ever wonder how we can write simulations simulating real world situations? Consider a simulation of molecules of hydrogen gas in a cylinder. To start the simulation there has to be some initial random movement of the molecules, otherwise there will be no movement at all. Also to determine realistic trajectories we need to introduce some random noise to simulate the effects of external forces to the cylinder. The question is simple. How do we do...

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nm-applet crash In UBUNTU 13.04 (Raring) and 13.10 (Saucy) and a simple fix

Two weeks back I decided to switch to Ubuntu 13.04. I was using 12.04 LTS version and everything was fine.  However I was seeing crash in bzr-gtk  upon bzr gcommit and hence I decided to upgrade. All was well until I saw the sys-tray icon of Network Manager crash upon switching connections due to  bug#1164631 and bug#1159063. I have to switch between connections often and this was frustrating. The worst part of all this is...

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MySQL 5.7 Enhanced MTS: configuring slave for Intra-database parallelization

MySQL 5.7.2 features enhanced Multi-threaded slave which can be used to apply transactions in parallel even within a single database. Internal details of its working can be found in an earlier post. In this  post we will see how we can configure our replication slave to use this enhancement. MySQL 5.7.2 has a new system variable  --slave-parallel-type which is dynamic. It can be set to the following values: 1. DATABASE  :...

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MySQL 5.7: Enhanced Multi-threaded slaves

Introduction Re-applying binary logs generated from highly concurrent master on the slave has always been an area of focus. It is important for various reasons. First, in real-time systems, it becomes extremely important for the slave to keep up with the master. This can only be guaranteed if the slaves’ performance in reapplying the transactions from the binary log is similar (or at-least comparable) to that of master, which is accepting queries...

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MySQL 5.7 Replication: mysqlbinlog tool idempotent mode while applying row events

Introduction MySQL replication slave features  a powerful capability of ignoring conflicts like duplicate key error, key not found errors etc. while applying row events.  This is exceptionally useful while doing row based replication(RBR) from the master when the slave already contains some data which may conflict with the data coming from the master. In MySQL 5.7 we extend this capability while applying row events from mysql-binlog files using mysqlbinlog tool.  This enhancement will prevent such errors from aborting mysql client...

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A sneak peek inside the Row Based Replication (RBR) in MySQL 5.6

With MySQL 5.6 coming closer to its release, I got a chance to sneak a look into the Row Based Replication (RBR). 5.6 release of MySQL will be a replication features packed one, and it is for this reason I write  another post on the new enhancements in Row Based Replication(RBR). RBR provides a safe way of replicating between master and slave and thats why RBR enhancements become even more important. RBR in 5.6 is far more optimized than...

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