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As you know MyISAM does not cache data, only indexes. MyISAM assumes OS cache is good enough and uses pread/pwrite system calls for reading/writing datafiles. However OS is not always good in this task, my benchmarks show Linux/Solaris aren’t scalable on intensive pread calls (I believe the same for Windows, but I did not test it). In 5.1 I implemented a new feature: memory mapping for the datafil
I wrote about FlashCache there, and since that I run couple benchmarks, to see what performance benefits we can expect. For initial tries I took sysbench oltp tests ( read-only and read-write) and case when data fully fits into L2 cache. I made binaries for FlashCache for CentOS 5.4, kernel 2.6.18-164.15, you can download it from our testing stage. It took some efforts to make binary, you may get
バグの話 近々ふぁぼったーDBのInnoDB化を企てているので、それに伴いMySQL5.0.67(Tritonn)から、先日リリースされたばかりのMySQL5.5.3-m3に乗り換えてみた。RC(リリース候補)版ということで、GA版とほぼ変わらない品質と聞いたので、割と軽い気持ちでインストールしたんだけど、いきなりバグにハマった。 バグとは、DATETIME, TIMESTAMP, DATE, TIME型と文字列定数との結合でインデックスが使われない、というもの。 以下のような、date(DATE型)の結合しかしていないクエリでも、dateインデックスが使われず昇順フルテーブルスキャンされ、20秒くらい掛かった。 select date from STATUS force index(date) where date='2010-01-19' limit 10; この現象は、5.5.3,5
In benchmarks passion (see my two previous posts) I managed to setup all three devices (RAID was on board; Intel X25-E SSD connected to HighPoint controller, FusionIO card) on our working horse Dell PowerEdge R900 (btw, to do that I had to switch from CentOS 5.2 to Ubuntu 8.10, as CentOS was not able to start with attached SSD card to HighPoint controller) and along with other tests I ran tpcc-lik
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