mysql query cache size

Two problems must be solved when Redis is used as the Mysql database cache. First, determine the data structure used to store data from Mysql. After determining the data structure, consider the identifier used as the key of the data structure. Intuitively, data in Mysql is stored by table. In a more microscopic view, t

, 0 rows Affected (0.00 sec)mysql> flush Tables;Query OK, 0 rows affected (0.01 sec)mysql> flush status;Query OK, 0 rows Affected (0.00 sec)mysql> flush Tables;Query OK, 0 rows Affected (0.00 sec)

Label:MySQL Memory structure InnoDB Primary index is clustered index, index and data common table space, for InnoDB, data is index, index is data. The biggest difference between the InnoDB cache mechanism and the MyISAM cache mechanism is that INNODB is not just a cache index, but also caches the data. InnoDB Cache Poo

increases. Caching the results of an unindexed query may sometimes behave worse as data grows. As the data grows, those who miss the cache may get a bad experience, and such an application is not available.2, the optimization of MySQL does not need to worry about cache invalidation or

increases. Caching the results of an unindexed query may sometimes behave worse as data grows. As the data grows, those who miss the cache may get a bad experience, and such an application is not available.2, the optimization of MySQL does not need to worry about cache invalidation or

MySQL optimization-performance analysis and query optimizationoptimization should be carried out throughout the product development cycle, such as when writing complex SQL to view the execution plan, when installing the MySQL server as reasonable as possible (see too much to completely use the default configuration installation), Choose a reasonable hardware conf

[Email protected] log]# pt-query-digest Slowq.log# 200ms User Time, 10ms system time, 24.39M rss, 205.12M vsz# current Date:thu Dec 17 15:32:04 2015# hostname:hank-yoon.com# Files:slowq.log# Overall:8 Total, 2 unique, 0.00 QPS, 0.00x concurrency ________________# time RANGE:2015-12-17 05:00:09 to 15:30:01# Attribute Total min max avg 95% StdDev Median# ============ ======= ======= ======= ======= ======= ======= =======# Exec time 15s 1s 7s 2s 7s 2s

When you join multiple tables to query data, write multiple SQL statements for separate query, or write an SQL statement for joint query? When you join multiple tables to query data, write multiple SQL statements for separate query, or write an SQL statement for joint

multiple tables, for example:3, always take out all the columns: every time you see a SELECT * you need to wonder if you really need to return all the columns? By removing all columns, the main optimizer is unable to complete an index overlay scan such optimizations, and it also brings additional IO, memory, and CPU consumption to the server. If your application uses some kind of caching mechanism, or if you have other considerations, it might be beneficial to get more data than you need, but d

How to limit the size of returned result sets in Oracle and MySQLIn ORACLE: How can I use rownum to limit the number of rows returned by a query?Software environment:1. Windows NT4.0 + Oracle 8.0.42. Oracle installation path: C:/orant Description:1. rownum is the number of the row returned from the query in the Oracle system. The first row is allocated 1 and the

MySQL index principle overview and slow query optimization practices MySQL has become the preferred relational database for most Internet companies thanks to its outstanding performance, low cost, and rich resources. Although the performance is outstanding, the so-called "good horse with good saddle", how to better use it, has become a required course for develop

indexes or are illegal. although it takes a lot of time to process those slow statements, it is worthwhile to avoid database crashes. when there are too many connections in the database, the program will automatically save the processlist of the current database. this is a good tool for DBA to find the cause. when using mysqlbinlog for analysis, we can get a clear period of time when the database status is abnormal. some people will make the mysql co

constantly updated .) The MySQL query optimization program uses indexes. Of course, it also uses other information. For example, if the following query is published, MySQL runs it very quickly, regardless of the size of the corresponding table:SELECT * FROM tb1_name WHERE 1

Mysql Sort aborted: Out of sort memory, consider increasing server sort buffer size solution, abortedincreasing When checking the mysql server today, the system prompts Sort aborted: Out of sort memory, consider increasing server sort buffer size. The installation literal means that the sort memory overflows, and you n

Tags: database access line Redis server get frequent demand SSO RACIntroduction to using Redis as a cache for MySQL In the actual project, the MySQL database server is sometimes located in another host, need to access the database through the network, even if the application and the MySQL database in the same

My. cnf cache optimization tips: MYSQL Tutorial: my. cnf cache optimization. 1. check the machine configuration. The three main parts are cpu, memory, and hard disk.2. check mysql configuration parameters.3. check the mysql row status. you can use the mysqlreport tool to vi

queries with a large record volume, the query format is relatively fixed. for example, large-capacity monthly reports and annual reports tend to query the statement performance. Queries with a relatively small number of records, such as daily reports or frequently used query statements, tend to be more flexible in queries. As a developer, you need to select an a

How to limit the size of returned result sets in Oracle and MySQLIn ORACLE: How can I use rownum to limit the number of rows returned by a query?Software environment:1. Windows NT4.0 + Oracle 8.0.42. Oracle installation path: C:/orant Description:1. rownum is the number of the row returned from the query in the Oracle system. The first row is allocated 1 and the

creating threads, which is also a relatively resource-intensive, can appropriately increase the thread_cache_size value in the configuration file, Query Server Thread_cache_size configuration:Mysql> Show variables like ' thread_cache_size ';+-------------------+-------+| variable_name | Value |+-------------------+-------+| Thread_cache_size | 64 |+-------------------+-------+The server in the example is still quite healthy. Seven,

Tags: Running MySQL Status View monitor running MySQL, one way is to view MySQL running status. (1) QPS (query amount per second) QPS = Questions (or Queries)/seconds mysql > show global status Like ' question% '; (2) TPs (transaction volume per second) TPS = (Com_com