Emergency

Search Results for: tables fragmentation

Pretty-formatted index fragmentation with xtrabackup

The xtrabackup compiled C binary (as distinct from XtraBackup, which is the combination of the C binary and the Perl script) has support for printing out stats on InnoDB tables and indexes. This can be …

Read More
 

Avoiding Fragmentation with Fractal Trees

Summary B-trees suffer from fragmentation. Fragmentation causes headaches — in query performance and space used. Solutions, like dump and reload or OPTIMIZE TABLE are a pain and not always effective. Fractal trees don’t fragment. So …

Read More
 

Attempting to Quantify Fragmentation Effects

by:

We often hear from customers and MySQL experts that fragmentation causes problems such as wasting disk space, increasing backup times, and degrading performance. Typical remedies include periodic “optimize table” or dump and re-load (for example, …

Read More
 

INFORMATION_SCHEMA tables in the InnoDB pluggable storage engine

Much has been written about the new InnoDB pluggable storage engine, which Innobase released at the MySQL conference last month. We’ve written posts ourselves about its fast index creation capabilities and the compressed row format, …

Read More
 

Quickly preloading Innodb tables in the buffer pool

In the previous post I mentioned a way I use to preload Clustered Index (data) for Innodb tables. Though I thought this topic would benefit from a bit more information. But lest first start with …

Read More
 

MySQL File System Fragmentation Benchmarks

Few days ago I wrote about testing writing to many files and seeing how this affects sequential read performance. I was very interested to see how it shows itself with real tables so I’ve got …

Read More
 

Working with many files and file system fragmentation

Working on performance optimization project (not directly MySQL related) we did a test – creating 100 files writing 4K in the random file for some time and when checking the read speed on the files …

Read More
 

Why TokuDB hates Transparent HugePages

If you try to install the TokuDB storage engine on a modern Linux distribution it might fail with following error message: 2014-07-17 19:02:55 13865 [ERROR] TokuDB will not run with transparent huge pages enabled. 2014-07-17 …

Read More
 

Use TokuMX Partitioned Collections in Place of TTL Indexes

Take the following scenario. You have a time-series data application for which you would like to store a rolling period of data. For example, you may want to maintain the last six months of traffic …

Read More
 

How to monitor ALTER TABLE progress in MySQL

While working on a recent support issue as a Percona Support Engineer,  I got one question from a customer asking how to monitor ALTER TABLE progress. Actually, for MySQL 5.5 and prior versions, it’s quite difficult to ALTER the …

Read More