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For a database configuration tuning only please look first at our MySQL database health check. Some recommendations are dangerous! Dangerous means you can loose or get inconsistent data in certain cases. Only use them if you know what you are doing!!! And see also Relative Impact on Performance p. Enable the slow query log with a long query time of for example 10 and then restart the server. Then wait for a appropriate period of time which represents your typical business for example 1 day, or 1 week or 1 month.
Check if everything works fine by provoking a slow query for example cartesian product: Decrease long query time to for example 5, then 3, then 2 and then 1 second. Have you now some queries in it? Treat the slow query log with the following command: Pick the first query look for its original in the slow. If you have too many Slaves more than 20 - 40 Slaves per Master this could be the issue.
Try to use cascaded replication. Check if you have problems with the network between your Slave and your Master ifconfig, ping, etc. If you transfer too much data this could also be the issue. Can you afford to wait for hours when transaction must be rolled back or database crashes during data load? Try using a bit architecture. About us Services Tools Resources Download. Acknowledgement Thanks to the following people for hints: Jens Bollmann Efficiency of Performance Tuning measurements Before you start tuning you should think about the following graph: Start last updated Do you have performance problems?
Do not tune your system it only can get worse! Have you ever tuned your system? You have already started to tune your system Chose the area you want to tune the following order is recommended: You have not yet tuned your system You can choose now between 3 tuning paths: You choose the more systematical path go through ff.
You choose the more profitable path. Have you enabled the slow query log? You did not yet enable the slow query log Enable the slow query log with a long query time of for example 10 and then restart the server. You have enabled the slow query log Did you get any slow queries? You have enabled the slow query log but no queries in it Check if everything works fine by provoking a slow query for example cartesian product: Slow query log works fine but now queries in it Decrease long query time to for example 5, then 3, then 2 and then 1 second.
Slow query log works fine but now queries running longer than 1 second in it Is the system performance acceptable for you now? You got a huge amount of queries in the slow query log Treat the slow query log with the following command: Your system is read heavy Enable query cache.
Disable query cache again. Your system is not read heavy Do you use InnoDB tables only? Do you use InnoDB tables? Do you use other storage engine tables? You use other storage engines tables There are some much faster solutions around! Architecture tuning The following items can help: Indexing Do you have fully redundant indices? Use BIT for status Table design tuning Remove not needed attributes. You probably do not have a Replication Performance problem. Please contact us to get more help.
Too many Slaves If you have too many Slaves more than 20 - 40 Slaves per Master this could be the issue. Problems with the Network Check if you have problems with the network between your Slave and your Master ifconfig, ping, etc.
Problems found and solved and lagging disappeared? Too much data If you transfer too much data this could also be the issue. We have to investigate more in detail. It comes because of severl reasons: Is the query really needed like this? Do you really need a sorting? Is your MySQL server already running a reasonable amount of time uptime, 1 period of usual business for example 1 day or 1 week? What storage engine are you using? You are using mixed storage engines, general parameters Slow query log enabled?
Check for slow queries. Do you have slow queries? Have you binary logging enabled? Do you need binary logging? Are you using the MySQL query cache? Updating PK's is expensive. Try to avoid this. Data load tuning Do you have performance problems with your data load? Data load InnoDB variable tuning Can you manually roll back or restart your data load when system crashes during data load? This can take hours.
Make smaller pieces of your transaction. Delete rows from table during data load Do you have to delete all rows from a table? Because utf8 uses more space 3 bytes for indices and CHAR attributes you should only define your columns with utf8 when you really need it!
InnoDB double write tuning Can you risk to get corrupted data after system crash? Larger log files means longer recovery time! A good point to start is: This parameter is very system and OS dependent you have to play around with it and benchmark your system! InnoDB max dirty pages tuning Do you have several little peaks a day you want to break? InnoDB flush log tuning Do you have have battery cache disk buffers? InnoDB flush log tuning Can you afford to lose up to 1 second of your data?
InnoDB checksum tuning Can you risk to be not aware of physical data corruption? Separate your InnoDB tablespace files from your InnoDB log files on different physical disks if you do not have "stripe everything everywhere" disk architecture.
InnoDB tablespace tuning Do you have per-file tablespaces? Try to use raw devices. This should only be done as last resort. Some file systems do not perform optimal. Use recent file systems. Use NPTL thread library. File System tuning Hardware Tuning Are you using hyper threading on your system?
You are using hyper threading Disable hyper threading. Disabling hyper threading did not help Are you using bit Architecture? You are using bit Architecture bit architectures sometimes performs better. Application tuning Do you have data loads which are to slow? Application tuning other problems Not yet implemented.
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