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.
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Databases
Summary of changes in MySQL 5.6
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.
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MySQL: How Triggers act in Replication
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 of the triggers be replicated? Q2, Will the data manipulation sqls triggered by triggers be […]
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MySQL 5.5.15 GA Released
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 an InnoDB table could result in some memory being allocated and not freed. This memory […]
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MongoDB init script on Ubuntu
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 steps: 1, Create a configuration file for MongDB, which is located at /etc/mongodb.conf
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Flashcache: caching data in SSD disks
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.
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Purge MySQL Binary Logs periodically
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 to enable this binary logging if your server is acting as a relication master or […]
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Ways to reset MySQL user password
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 is on how to reset MySQL DBA password (By default, this user is called root).
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Cassandra: Structured Key-Value based storage system
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 model running on a Amazon Dynamo-like infrastructure.
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Tips for Rebuilding MySQL Replication
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 database. It covers three types of information, a snapshot of your current mysql database, and […]
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