Monthly Archives - January 2009

iiBench with deletes

We modified the iiBench benchmark to perform deletions as well as insertions, and compared InnoDB to Tokutek’s Fractal TreeTM storage engine, both running on MySQL 5.1. I’ll post the revised iiBench tarball soon.
Here is what the performance looks like:

The iiBench-with-deletions benchmark works as follows. The benchmark employs a fact table with an […]

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The perils of InnoDB with Debian and startup scripts

Are you running MySQL on Debian or Ubuntu with InnoDB? You might want to disable /etc/mysql/debian-start. When you run /etc/init.d/mysql start it runs this script, which runs mysqlcheck, which can destroy performance.
It can happen on a server with MyISAM tables, if there are enough tables, but it is far worse on InnoDB. […]

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Another scalability fix in XtraDB

Recent scalability fixes in InnoDB and also Google’s and your SMP fixes almost made InnoDB results acceptable in primary key lookups queries, but secondary indexes were forgotten for some time. Now having Dell PowerEdge R900 on board (16CPU cores, 16GB RAM) I have some time for experiments, and I played with queries

Shell

SELECT name […]

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iiBench Fractal Tree Results

A few weeks ago I reported InnoDB performance on the iiBench 1-billion row insert test. Today I’m reporting on Tokutek’s Fractal TreeTM storage engine performance.
We ran iiBench on the same hardware (Sun x4150, 8 cores @ 3.16GHz, 16GB memory, 6 SAS disk HW RAID 0) using Tokutek’s storage engine for MySQL. The […]

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5.0.75-build12 Percona binaries

After several important fixes to our patches we made binaries for build12.
Fixes include:
Control of InnoDB insert buffer to address problems Peter mentioned https://www.percona.com/blog/2009/01/13/some-little-known-facts-about-innodb-insert-buffer/, also check Bug 41811 to see symptoms of problem with Insert buffer.
https://www.percona.com/docs/wiki/patches:innodb_io_patches
* innodb_flush_neighbor_pages (default 1) – When the dirty page are flushed (written to datafile), this […]

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Beware: ext3 and sync-binlog do not play well together

One of our customers reported strange problem with MySQL having extremely poor performance when sync-binlog=1 is enabled, even though the system with RAID and BBU were expected to have much better performance.
The problem could be repeated with SysBench as follows:

Shell

./sysbench –num-threads=2 –test=oltp –oltp-test-mode=complex –oltp-table-size=100000 –oltp-distinct-ranges=0 –oltp-order-ranges=0 –oltp-sum-ranges=0 –oltp-simple-ranges=0 –oltp-point-selects=0 –oltp-range-size=0 –mysql-table-engine=innodb […]

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