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Apache Cassandra is a NoSQL database intended for storing large amounts of data in a decentralized, highly available cluster. Cassandra database is the right choice when you need scalability and high availability without compromising performance.

Well, this is just a forwarded version from Xaprb.com, the highlighted points are a good summary. I don’t fully understands all the germs till now. The manual page is  worth a careful read if you want to know more details.

Supposed you have a table that being updated by MySQL triggers and the DB is a master of replication, how do the triggers act in the environment? Here we might have a list of questions: Q1, Will the definition sql…

MySQL 5.5.15 GA has been released in 28 July 2011. Functionality Added or Changed The undocumented –all option for perror is deprecated and will be removed in MySQL 5.6. Bugs Fixed InnoDB Storage Engine: A failed CREATE INDEX operation for…

By default, MongoDB does not supply any auto start/stop scripts for instance management. Here we’ll share a smart script to do so. It’s tested OK on ubuntu servers, and should work on Debian too. All you need to do are two…

Facebook released a kernel module called Flashcache this wednesday, which is used to speed up MySQL by caching data in faster media like SSD disks.  It’s only tested for kernel versions 2.6.18 and 2.6.20.

If you have binary logging enabled on your MySQL server (i.e. the log-bin parameter is set in the config file), then you may notice a bulk of large files in the MySQL data directory over time. Generally you only need…

How can I change user password under MySQL server when I lost my password? Here’s I’ll show two examples. The first example is about how to change password for normal user using Linux command line option, and the second example…

Cassandra is an open source distributed database management system. It was initially developed by Facebook for storing very large amounts of data. Jeff Hammerbacher, who led the Facebook Data team at the time, has described Cassandra as a BigTable data…

Let’s keep this post smart. It’s intended to help you rebuild a crashed MySQL replication. We assume that bin-log has been enabled at the master side. Basically what you need to do is to retrival a snapshot of your master…