Search Results for: b tree

Experimental GIT Mirrors of Percona XtraBackup, Percona Server plus Oracle MySQL trees

I recently blogged on setting up Experimental Git mirror of Oracle MySQL trees up on GitHub. I’m now happy to announce that there are also mirrors for: Percona Server Percona XtraBackup Percona Playback I’ve also updated the Oracle MySQL GIT mirror to include MySQL 5.7 and the (now abandoned) MySQL 6.0. I include the abandoned […]

Checking B+tree leaf nodes list consistency in InnoDB

If we have InnoDB pages there are two ways to learn how many records they contain: PAGE_N_RECS field in the page header Count records while walking over the list of records from infimum to supremum In some previous revision of the recovery tool a short summary was added to a dump which is produced by […]

Percona Server tree with support of Fusion-io atomic writes and DirectFS

Not so long ago Fusion-io announced an SDK which provides direct API access to Fusion ioMemory(tm) in addition to providing a native filesystem (directFS) with a goal to avoid overhead from kernel and regular Linux filesystems: ext4 and xfs. This requires a support from application, it should use special calls for IO. With help from […]

Where to get a BZR tree of the latest MySQL releases

I just posted this to the MySQL Internals mailing list: Hi all, Like many of you, I’m disappointed that the bzr trees for MySQL are out of sync with the tarball source and binary releases from Oracle. Since Oracle has been silent on this, and this is a recurring problem, I’ve decided to attempt to […]

Moving Subtrees in Closure Table Hierarchies

Many software developers find they need to store hierarchical data, such as threaded comments, personnel org charts, or nested bill-of-materials. Sometimes it’s tricky to do this in SQL and still run efficient queries against the data. I’ll be presenting a webinar for Percona on February 28 at 9am PST. I’ll describe several solutions for storing […]

MySQL sources from development tree

I just want to write few tips how to get MySQL from development BitKeeper tree, as there are several tricks. First of all you need a fresh free client – bk-client2.0 http://www.bitkeeper.com/Hosted.Downloading.html . Once you get it, you can clone latest tree: bkf clone bk://mysql.bkbits.net/mysql-5.0 mysql-5.0 New client supports “changes” command, so you can look […]

Percona TokuMXse 3.0.3-1.0-rc6 is now available

Percona is glad to announce the release of Percona TokuMXse 3.0.3-1.0rc6 on June 1st 2015. TokuMXse is a TokuMX storage engine for MongoDB 3.0.3. Downloads are available from our download site here. Packages for this Release Candidate release, will be available in our Ubuntu Trusty, Utopic, Vivid, and Debian Jessie apt testing and CentOS 7 […]

Storing time-series data with MongoDB and TokuMX

Storing time-series data is a frequent pattern for databases – be it for logs or for any kind of monitoring. Such data has the following properties: records are inserted but also never updated, the insertion rate can be high and records are likely to expire after some time. MongoDB and TokuMX are both good fits […]

Optimizer hints in MySQL 5.7.7 – The missed manual

In version MySQL 5.7.7 Oracle presented a new promising feature: optimizer hints. However it did not publish any documentation about the hints. The only note which I found in the user manual about the hints is: It is now possible to provide hints to the optimizer by including /*+ … */ comments following the SELECT, […]