mysql materialized view

View the maximum number of connections in MySQL and the number of connections in MySQLMysql version: mysql5.5.40 or Mariadb 10.0.14 Max_connections = 151 by default Method 1: Applicable to linux [Root @ mydata184 ~] # Mysqladmin-uroot-p variables | grep max_connections Method 2: Applicable to mysql client commands [Root @ mydata184 ~] #

View MySQL indexes and mysql IndexesMysql> show index from tblname; mysql> show keys from tblname; · Table name. · Non_unique: 0 if the index cannot contain duplicate words. If yes, it is 1. · Key_name index name. · Column serial number in Seq_in_index, starting from 1. · Column_name column name. · How the Collation co

The following articles mainly describe the MySQL view, including the overview of MySQ view L and the specific description of creating MySQL view-create view and modifying MySQL

You can see that/usr/local/cellar/mysql/5.6.24/my.cnf is the MySQL boot loaded configuration file.If the above command has no output, MY.CNF is not set using the specified directory.2. View MySQL default read my.cnf directoryIf you do not set a My.cnf,mysql startup

A viewA view is a virtual table (not a real one), which is essentially "getting a dynamic dataset from an SQL statement and naming it", which you can use as a table by simply using "name" to get a result set.Using views we can take out the temporary table in the query process, and use the view to implement, so that later on to manipulate the temporary table data without rewriting the complex SQL, directly t

Global long_query_time=0.1; #设置大于0.1s SQL statements recorded, I did not succeed in the experiment Results: The slow query log is turned on as follows: To view slow log configuration conditions: Mysql> show VARIABLES like "%slow%";+---------------------------+-------------------------------+| variable_name | Value |+---------------------------+-------------------------------+| log_slow_admin_statements | O

How to use SQL commands to view the Mysql database size bitsCN.com To know the size of each database, follow these steps:1. enter the information_schema database (storing information about other databases)Use information_schema;2. query the size of all data:Select concat (round (sum (data_length/1024/1024), 2), 'mb') as data from tables;3. view the size of the s

, x509_issuer, x509_subject) values ('localhost' test', password ('123 '), '','', ''); # refresh the system permission table mysql> flush privileges; # use the root account for User authorization, // create permissions for a view (database name. view Name) grant select, insert, update, delete on wcp. vj to test @ localhost; Table sharding: queries in the C-table

Use of MySQL ViewOverview: A view is a virtual table, also known as a derived table, because its content is derived from the query results of other tables. Although the view looks like a basic table, they are not basic tables. The basic table content is persistent, while the View content is dynamically generated during

View Mysql index page fragments bitsCN.com Query index page fragments: show table status like 'table name'; // when the value of the Data_free column is greater than 0, fragments are generated (as long as data is deleted, the premise is to create an index) OPTIMIZE the TABLE: optimize table name; create an index condition (or): The TABLE has a large amount of data (if the data size is small, the index crea

installedError:package mysql-.0.77-4.e15_.2 is not installedLinux View MySQL installation pathFirst, view the file installation pathSince there is more than one place to install the software, all the paths (addresses) that are first said to view the file installation.Take

Mysql view execution plan-explain MySQLexplain BitsCN. comauthor: skate Time: 2012/02/17 View execution plans in Mysql I. Syntax Explain Example: explain select * from t3 where id = 3952602; II. explain the output + ---- + ------------- + ------- + ------------------- + --------- + ------- + ------

application does not move. (4) If the app is built on a view, when the app changes, you can modify the view on the table, masking the app's changes through the view, so the database can be fixed.Create a ViewCreating a view refers to establishing a view on a database table