… to go to swap file it will more than defeat its purpose. Number of background threads are designed with assumptions they can… (multi CPU, multi client) processing. Database Locks/Latches are typically designed to be held for as short time as possible. The… swap file. The bottom line: You should configure system so no swapping activity is going on during normal operations. The swap file itself…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
… idea what hardware and operating system I’m working with. System performance Next I investigate what the system is doing, in terms of… saving them in a text file. I’ll attach this text file to the issue in our CRM system so I (or someone… of analysis information is our custom server, which we have designed exactly for the purpose of giving us as much insight…
Post: MySQL performance on EC2/EBS versus RDS
August 4, 2011 By 11 Comments
…with this — such as putting your transaction log files onto the local disks, for example — the …to think about. The physical and logical database design influences greatly how much memory and disk resources…and drawbacks of RDS versus building the equivalent system yourself. RDS is nice in that it’s…
Post: Evaluating IO subsystem performance for MySQL Needs
March 5, 2008 By 23 Comments
… tool I’m using for this is SysBench which was designed by my team when I still worked for MySQL and… –file-extra-flags=direct –file-fsync-freq=0 –file-total-size=128M –file-test-mode=rndrd run sysbench v0.4.8: multi-threaded system evaluation…-threaded system evaluation benchmark Removing test files… [root@DB10 sysbench]# ./sysbench –test=fileio –max-time=60 –max-requests=1000000 –file-num=128 –file-extra…
Post: Commodity Hardware, Commodity Software and Commodity People
June 15, 2007 By 9 Comments
… isolation modes. Perfect solution for absolute beginner. Now from queries design MySQL would support a lot of functions (which you can… to mention understanding all ups and downs of database management system. This sounds nice in theory but there are not so…. Amazon has S3 service which deals with files, I bet similar service could be designed for many of data store applications, especially…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… – which is amount of bytes Innodb has written in log files since system tablespace creation. You can also see up to which… system structures. Pending reads and writes are pending requests on buffer pool level. Innodb may merge multiple requests to one on file… you may see a bit conflicting information. This is by design as requiring global lock to provide consitent information would cause…
Post: What's required to tune MySQL?
July 27, 2011 By 4 Comments
… the InnoDB buffer pool size or log file size, and not using InnoDB. If your …, it’s not likely to improve the system‘s performance dramatically, all things considered. More …server configuration The workload The queries The schema design (table design, data types, indexing, etc) The data …
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… loggable event. The next characteristic of a lot of these systems (real or planned) is the desire for “real-time” analysis… log files out of the database. The database is usually the most expensive and hardest-to-scale component in your system… memory, or even with 10-15x fewer servers. Clever application design, and a holistic approach, are absolutely necessary. You can’t…
Post: Is disk Everything for MySQL Performance ?
April 25, 2008 By 7 Comments
…. There are whole classes of systems where Disk performance is not that important – consider for example systems where most of the database… of data in. Many Web 2.0 sites in particular design for having everything they need in memory, which is not… BBU most likely data files is where all IO will go. If you dedicate RAID1 volume for Operating system and another one…
Comment: MySQL Server Memory Usage
September 1, 2006 By 21 Comments
… innodb in the app. The application is designed in a way that if allowed we… stats at writing time (18:37 friday) System copes fine with these figures. Queries/sec: …Connections’, ’263413′ ‘Created_tmp_disk_tables’, ’0′ ‘Created_tmp_files‘, ’4001′ ‘Created_tmp_tables’, ’669137′ ‘Delayed_errors’, ’0…
