mysql query performance tuning

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MySQL performance tuning for 14 axe

|+-----------------------+-------------+| Handler_read_first | 5803750 || Handler_read_key | 6049319850 || Handler_read_next | 94440908210 || Handler_read_prev | 34822001724 || Handler_read_rnd | 405482605 || Handler_read_rnd_next | 18912877839 |+-----------------------+-------------+ Number of query requests paged out by the server: mysql> show global status like ' Com_select '; +---------------+--------

MySQL Performance tuning my.cnf detailed

stored in the cache can be re-used, and if there is room in the cache when disconnected, the client's thread will be placed in the cache.# If the thread is requested again, then the request will be read from the cache, if the cache is empty or a new request, then the thread will be recreated, if there are many new threads,# Increasing this value can improve system performance. You can see the effect of this variable by comparing the variables of the

Master-Slave synchronization, read/write separation, MySQL performance tuning (soft optimization)

logEnabled by default Vim/etc/my.cnf[Mysqld]Options: Wq#systemctl Stop mysqld;#systemctl start mysqld; Error log: Log error messages generated by the service during startup and operationLog-error=/var/log/mysqld.log Query log: Records all SQL commands that are executed after the client connects to the service.[Mysqld]General-log cat/var/lib/mysql/host name. Log Slow qu

MySQL performance tuning and Architecture Design-Chapter 7 MySQL database Locking Mechanism

the read priority. Therefore, if we can determine the reading and writing priority based on the differences in their respective system environmentsLevel. If our system is read-oriented and the query performance must be guaranteed first, we can set System Parameter options.Low_priority_updates = 1. Set the write priority to lower than the read priority, so that MySQL

MySQL performance tuning and architecture design-the 17th chapter on the ideas and solutions of high-availability design

are some bugs, is not necessarily applicable to the core of the online system.3. DRBD Disk Network mirroring schemeAdvantage: Software is powerful, data is mirrored across physical hosts at the underlying fast device level, and different levels of synchronization can be configured according to performance and reliability requirements. IO operations are kept in order to meet the database's demanding data consistency.Disadvantage: Non-Distributed File

MySQL performance tuning and architecture design is coming soon

4.2 MySQL permission system Introduction 4.3 MySQL Access Authorization Policy 4.4 Security Settings considerations Conclusion 4.5 Chapter 2 MySQL backup and recovery 5.0 Introduction 5.1 Use Cases of Database Backup 5.2 logical backup and recovery test 5.3 physical backup and recovery test 5.4 backup policy design ideas

MySQL performance tuning primer script description

MySQL performance tuning primer script is a simple and easy-to-use mysql optimization tool. In fact, it is a shell script. Download: $ Wget http://www.day32.com/MySQL/tuning-primer.sh Run $ Sh

MySQL Performance tuning direction

time should not be set too long, otherwise the meaning is not very good, preferably within 5 seconds, if you need a microsecond level of slow query, Consider a patch for MySQL: Http://www.percona.com/docs/wiki/release:start, remember to find the corresponding version.Turning on the slow query log may have a little impact on system

MySQL Performance tuning ideas

Tags: different issues lob STR Peak Multi-table BSP must not1.MySQL Performance Tuning IdeasWhat if a server has a long time load too high/ periodic load is too large , or occasionally stuck how to handle ? is it a cyclical change or an occasional problem ? is a problem with overall server performance , or the questio

MySQL tuning three steps (slow query and explainprofile)

performance testing process. Below I will introduce three tools that are frequently used in the performance tuning process of msyql: 1. Slow query (analyze problematic SQL statements) 2. Explain (shows how mysql uses indexes to process select statements and connect table

MySQL performance tuning and architecture design Note: Three MySQL security management

authorize other users with the permissions that they own, usually with the following: With GRANT option to achieve the purpose of authorization.9, we can grant all available permissions for a level to a user through the grant all statement:Grant all on TEST.T4 to ' ABC ';Note: The above five permissions: Table,column,routine the objects that are dependent upon authorization must be present, unlike database level, which can be authorized when the current database does not exist.4.2.4 access Cont

MySQL Database Performance Tuning summary accumulation

are not frequently join. Otherwise less efficient. 3 Tuning for SQL ---Avoid full fuzzy query%like%, it will invalidate the index. ---Avoid using SQL functions directly in SQL, SQL functions invalidate cached queries and replace them with variables. ---Large-volume operations are more efficient with limit batching (avoid locking the full table), and with limit 1, it is more efficient to know that only 1 qu

Mysql database parameter file performance debugging tool: tuning-primer.sh

last few lines of each test result. Pay special attention to the memory, which easily exceeds the memory configuration] Using login values from ~ /. My. cnf-Initial login attempt failed-Testing for stored webmin passwords:None FoundCocould not auto detect login info!Found potential sockets:/tmp/mysql. sockUsing:/tmp/mysql. sock # I believe you can understand the following items, but I will not explain them

Mysql Tomcat c3p0 System Performance Tuning Personal Summary

-XX: maxpermsize=256m-xx:+disableexplicitgc-xx:maxtenuringthreshold=31-xx:+useconcmarksweepgc-xx:+useparnewgc-xx:+ cmsparallelremarkenabled-xx:+usecmscompactatfullcollection-xx:largepagesizeinbytes=128m-xx:+ Usefastaccessormethods-xx:+usecmsinitiatingoccupancyonly-djava.awt.headless=trueTo apply the C3P0 connection pool configuration:Query configured MySQL maximum number of connections 1000, configure C3P0 Connection pool 800 Configure Tomcat link 800

6\mysql master-Slave synchronization, MySQL read/write separation, MySQL performance tuning

; set [global] Variable name = value;Permanently definedVim/etc/my.cnf[Mysqld]Variable name = value....: Wq#systemctl Restart MysqldMySQL architecture?Connection poolSQL interfaceAnalyzerOptimizerQuery cacheStorage EngineFile systemManagement toolsHow does the MySQL service process query requests?4 The SQL query command of the

10 MySQL Performance tuning methods _ MySQL

may find that MyISAM is faster than InnoDB because MyISAM only caches indexes, while InnoDB caches data and indexes. MyISAM does not support transactions. However, if you use innodb_flush_log_at_trx_commit = 2, you can achieve close read performance (a hundred times different ).1.1 How to convert an existing MyISAM database to InnoDB: mysql -u [USER_NAME] -p -e "SHOW TABLES IN [DATABASE_NAME];" | tail -n +

MySQL Performance tuning

structures, the more tables, need to allocate more memory, a version set to 16MB(3) Innodb_log_buffer_size: The buffer used by the transaction log.7.3 Query cache is used in different environments: its function is to cache SELECT statements and result sets. The query cache will never return stale data, and any related entries in the query cache will be erased wh

Performance Tuning of MySQL Databases in Linux

Hardware preparation environment: Hard Disk: 16 SAS15KRAID5 with 512 MCacheCPU: AMD4 core two memory: 16 GB software environment: Operating System: RedHatAS4.62.6.9 Hardware preparation environment: Hard Disk: 16 SAS 15 K RAID5 with 512 MCacheCPU: AMD 4-core two-core memory: 16 GB software environment: Operating System: RedHat AS4.6 2.6.9 Hardware preparation environment: Hard drive: 16 SAS 15 k raid 5 with 512 MCache CPU: AMD 4-core two Memory: 16 GB Software environment: Operating System:

Performance Tuning of MySQL Databases in Linux

Hardware preparation environment: Hard drive: 16 SAS 15 k raid 5 with 512 MCache CPU: AMD 4-core two Memory: 16 GB Software environment: Operating System: RedHat AS4.6 2.6.9-67. ELsmp Mysql: 5.0. Performance Tuning based on different scenarios is as follows: Scenario: Write operations (insert, query, and delete) are in

Mysql Tomcat C3p0 System Performance Tuning personal summary,

Mysql Tomcat C3p0 System Performance Tuning personal summary, System Information The application logic is to use c3p0 to query data in the database and return Json data over http. 1. the initial test result JMeter test result before optimization No. Type Original 1000 data bigger 1 500 Co

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