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How well do your tables fit in buffer pool

 | March 26, 2010 |  Posted In: MySQL, Percona Software

In XtraDB we have the table INNODB_BUFFER_POOL_PAGES_INDEX which shows which pages belong to which indexes in which tables. Using thing information and standard TABLES table we can see how well different tables fit in buffer pool.

You can also see in one of the cases the value shown is a bit over 100% – […]

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Announcing TokuDB v3.1

 | March 25, 2010 |  Posted In: Tokutek, TokuView

Tokutek is pleased to announce immediate availability of TokuDB for MySQL, version 3.1. It is designed for continuous querying and analysis of large volumes of rapidly arriving and changing data, while maintaining full ACID properties. TokuDB v3.1’s new functionality includes: Improved handling of a full disk Configurable disk space reserve Faster group commits Faster crash recovery […]

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RAID throughput on FusionIO

 | March 24, 2010 |  Posted In: Benchmarks, MySQL

Along with maximal possible fsync/sec it is interesting how different software RAID modes affects throughput on FusionIO cards. In short conclusion, RAID10 modes really disappoint me, the detailed numbers to follow. To get numbers I run

test with 16KB page size, random read and writes, 1 and 16 threads, O_DIRECT mode. FusionIO cards are […]

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 | March 24, 2010 |  Posted In: MySQL, Percona Software

Dear Community, It is time to announce the next version of backup software from Percona – XtraBackup 1.1. The list of changes in version 1.1 includes: Changelog: XtraBackup is built on a base of MySQL 5.1.44 with InnoDB plugin 1.0.6 Added –host option tar4ibd can treat over 64GB file tar4ibd is default method for stream, […]

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fsyncs on software raid on FusionIO

 | March 23, 2010 |  Posted In: MySQL

As soon as we get couple FusionIO cards, there is question how to join them in single space for database. FusionIO does not provide any mirroring/stripping solutions and totally relies on OS tools there. So for Linux we have software RAID and LVM, I tried to followup on my post How many fsync / sec […]

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 | March 20, 2010 |  Posted In: MySQL, Percona Software

In Released and new coming features I did not mentioned two additional INFORMATION_SCHEMA tables available in XtraDB: It is INNODB_TABLE_STATS INNODB_INDEX_STATS These table show statistics about InnoDB tables ( taken from InnoDB data dictionary). INNODB_TABLE_STATS is | table_name | table name in InnoDB internal style (‘database/table’) | | rows | estimated number of all rows […]

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Is your MySQL Server Loaded ?

 | March 19, 2010 |  Posted In: Benchmarks, Insight for DBAs, MySQL

So you’re running the benchmark/stress test – how do you tell if MySQL server is really loaded ? This looks like the trivial question but in fact, especially when workload consists of simple queries I see the load generation and network really putting a lot less load on MySQL than expected. For example you may […]

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When the subselect runs faster

 | March 18, 2010 |  Posted In: Insight for Developers, MySQL

A few weeks ago, we had a query optimization request from one of our customer. The query was very simple like:

This column in the table is looks like this:

The table have 549252 rows and of course, there is an index on the col1. MySQL estimated the cardinality of that index as […]

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