mysql performance tuning tools

; 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 query database written by the program is unreasonable, resulting in slow database processingEnable slow query log on the datab

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 performance, and if your MySQL

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Tags: creating overrides efficient possibilities setting performance BBS HTML nbspOriginal: http://bbs.landingbj.com/t-0-245452-1.html For the optimization of the index, we first need to find the appropriate field, the second create the index to find the appropriate order, the third to find the appropriate proportion, and four is to do the appropriate maintenance. First you need to find the right field. Methods are: Improve filtering, reduce the inde

memory disk Mkdir-p/mnt/ramdisk sudo mount-t tmpfs-o size=4000m tmpfs/mnt/ramdisk/ mv/var/lib/mysql/mnt/ramdisk/mysql 9. Use MYSQL in a NOSQL way B-tree is still one of the most efficient indexes, and all MYSQL is still not obsolete. Using Handlersocket to skip MySQL's SQL parsing layer,

find some useful information about these three file systems: File system Xfsext4btrfs file system maximum capacity 8eb1eb16eb Maximum file size 8eb16tb16eb Our article details the pros and cons of Linux file systems: Linux file System parsing. 13. Set the maximum allowed data packets for MySQL MySQL splits the data into packages. Typically a package is a row of data that is sent to the client. The Max_all

MySql Performance Tuning (3) Table Design I. first introduce several concepts:1. full function dependency: in the relational mode R (U) of the property set U, if X-> Y, and for any real subset of X ', if both have x' 2. Pass function dependency: In R (U), if X-> Y, Y-> Z, Z is called the transfer function dependency of X. Ii. Paradigm Relational databases ha

reading or writing to the same table, and the read and write operations of other processes are performed only after the write is released."Example":Open another session:Session 2 will wait until the session is released with a lock.Simultaneous session 2 execution:Two Demo of row LocksThe InnoDB storage engine is implemented by locking the index entries, which means that the InnoDB uses row-level locks only if the data is retrieved by index criteria, otherwise INNODB will use a table lock.1. Row

Time Type:1.5 time types are supported in MySQL, namely date, hour, DATETIME, timestamp, and year.In the daily build table we want to use the timestamp type first, it has the function of automatic update time, example:You can also set not to update automatically, only the default value is empty. Such as:2. Year (2) type is automatically converted to year (4) typeMySQL Performance

higher the better. Iv. innodb_additional_mem_pool_size (Default 8M) Innodb_additional_mem_pool_size sets the amount of memory space that the InnoDB storage engine uses to hold data dictionary information and some internal data structures, so when we have a very large number of database objects in MySQL instance, It is necessary to adjust the size of this parameter appropriately to ensure that all data can be stored in memory for increased access eff

the index name"Created November 27, 2016"Mysql5.7/percona Version 5.7 Support2) The online DDL modifies the varchar field property when the table is not locked"created November 27, 2016"MySQL 5.7 has been enhanced for DDL functionality, and modifying the varchar field has not locked the table.* Algorithm for specifying the algorithm to create or delete an index* Copy means to create a temporary table and copy the data in full form, with the original

1m-2m size, and then set it individually on demand in each session. 4, Read_rnd_buffer_size For sorting and order by operations, it is best to set it to 1M and then set it as a session variable to a larger value in the session. (v) Slow query log A slow query log is a useful feature of MySQL. 1, Log_slow_queries MySQL parameter in the log_slow_queries parameter set it in the My.cnf file, set it to on, by d

log Log_error[=name]//Log error messages for the Enable/run/stop processQuery log general_log,general_log_file=//Record client connection and query operationsSlow query log slow_query_log,slow_query_log_file=,long_query_time=//record query operations that take a long time or do not use indexesLog Slow query:Slow-query-log//Enable slow querySlow-query-log-file//Specify slow query log fileLong-query-time//queries that exceed a specified number of seconds (default 10 seconds) are loggedLog-queries

the number of empty means the cache is used unreasonable (always run out)2.4 MySQL Log type(1) Error log: Log information generated by the database service during startup and operation, enabled by defaultThe Log-error=/var/log/mysqld.log in/ETC/MY.CNF(2) Binlog log: Default is not enabled.(3) query log: Record all executed SQL commands, not enabled by defaultVim/etc/my.cnf[Mysqld]General-log #默认存储位置/var/lib/mysqlDefault name: Host name. log(4) Slow q

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 Connection 250 query/S 63q/S70q/S

Tags: MySQL performance tuning three-table designA First introduce several concepts: 1. Full function dependency: In the relationship mode R (U) on the attribute set U, if x->y, and for any one true subset X ' of X ', there is X ' ≠>y, then Y is dependent on the X full function. 2. Transfer function dependency: in R (U), if x->y,y->z, the Z-to-X transfer functio

Tags: MySQL performance tuning four quick modify table structure1. Modifying the varchar type To meet the requirements, the varchar (6) is now converted to varchar (8). The better approach is not to use altertable modify, but instead take the following steps: A Create a temporary table and set the varchar to varchar (8) as follows: B. Replace the. FRM tab

Tags: mysq tuning target considerations level MySQL performance efficiency transaction1. The leftmost principle notice encounters > 2. Invalid left-most index encountered for like query3.SQL Performance Optimization Goal: at least the range (range lookup to index) level is required to be a ref (normal index) level, pre

efficient results. Http://bbs.linuxtone.org/thread-5152-1-1.html3. Operating System-level optimizationA> A 64-bit system can allocate more memory and service tuning to a single process, disable unnecessary services, modify file descriptor restrictions, and reserve more resources for MySQL;B> File System Optimization: XFS is recommended for a separate file system for the data warehouse, which is generally m

Problem:A system, MySQL database, after the data is large. MySQL CPU utilization is very high, a Test side access to the server when MySQL CPU utilization is 15%, 6 test end of the server when the MySQL CPU occupancy rate is 50%~60%.PS 1: Each Test side of the thing is to insert records, but before inserting will first