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Performance Counter Analysis Object Counter Analysis Processor %processor time Recommended threshold Value 85% Memory Available bytes The recommended threshold value is less than 4MB to add memory; In addition, it is recommended that you have at least 10% of the physical memory value Pages reads/sec Page reads/sec refers to the num

Tags: date orm modify table hint har rom drop number displayNote: The MySQL database command is not case sensitive. But in the Mac terminal, if you want to use the tab auto-Complete command, then you have to use uppercase, so that the Mac terminal will help you complete the command, otherwise you press N times tab will not respond. 1. Database management 1.1. Create Database Create Database Firstdb; 1.2. Show view all databases mysql> show databases; +--------------------+ | Database

transaction_tbl for testing:CREATE TABLE transaction_tbl (id int (4)) Engine=innodb; INSERT into Transaction_tbl value (1), insert into Transaction_tbl value (2), insert into TRANSACTION_TBL value (3), insert I NTO transaction_tbl Value (4); INSERT into Transaction_tbl value (5);The ability to turn off auto-commit during normal use is enabled by default systemMysql> SHOW GLOBAL VARIABLES like ' autocommit ';+---------------+-------+|variable_name |Value |+---------------+-------+|autocommit | O

Summary of some important MySQL performance indicator calculation and optimization methods, mysql performance indicator 1 QPS calculation (queries per second) For databases dominated by MyISAM Engines MySQL> show GLOBAL status like 'questions';+---------------+------------+| Variable_name | Value |+---------------+------------+| Questions | 2009191409 |+---------------+------------+1 row in set (0.00 sec)mysql> show global status like 'uptime';+--

Open terminal and enter the following command: /usr/local/mysql/bin/mysql-u root-p Where Root is the user name. The following command appears: Enter Password: At this point, if you do not change the password, directly hit enter. Otherwise, enter your password.This will allow you to access your database server. 1, the operation and management The base of the data table Database management 1.1 CREATE Database Create Database Firstdb; 1.2 Show view all databases Mysql> Show databases;+---------

Label:Below is a summary of the commonly used MySQL operation statements (Win7) below: 1. Database Management 1.1 CREATE Database Create Database Firstdb; 1.2 Show view all databases mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | Firstdb | | mysql | | performance_schema | +--------------------+ 4 rows in Set (0.00 sec) 1.3 alter modifies the database The ALT

disconnects the client. The set autocommit can modify the way the current connection is submitted, and if set autocommit=0, all the transactions after Setup need to be committed or rolled back by explicit commands. If we only need transaction control over certain statements, it is convenient to start a transaction using start transaction, so that the transaction can be automatically returned to autocommit after the end, if we want all of our transactions to be not autocommit, It is con

1. Inserting Datainserting a single row of data ( inserts a single row of data if the found statement contains a set keyword)GrammarInsert into table_name setfield 1>= value 1,field 2>= value 2,field 3>= value 3;First look at the table structuremysql> desc T1;+-------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-------+-------------+------+-----+---------+-------+| ID | Int (11) | YES | | NULL | || name | varchar (20) | YES | | NULL | |+-------+--

keyword is the filter for the condition after the categorized result; having and where is the difference: having is a condition filter for the results of the aggregation, Where is the filtering of records prior to aggregation, and if logic allows, it is recommended to use where to filter as much as possible, because the result set is reduced, the efficiency of the aggregation is greatly increased, and then the logical view of whether to re-filter the 6) Table connection: Table joins are di

Label:1: Creating Tables and stored procedures mysql> CREATE Database Trx; Query OK, 1 row affected (0.02 sec) mysql> use TRX Database changed mysql> CREATE TABLE Test_trx ( - Gt ID int (5), uname char (+)), engine =innodb; Query OK, 0 rows affected (0.01 sec) mysql> DROP PROCEDURE IF EXISTS pro_trx $$ Query OK, 0 rows affected (0.00 SEC) mysql> DE

MySQL performance indicator calculation and Optimization1 QPS computing (queries per second) for databases dominated by the MyISAM Engine Mysql> show GLOBAL status like 'questions ';+ --------------- + ------------ +| Variable_name | Value |+ --------------- + ------------ +| Questions | 2009191409 |+ --------------- + ------------ +1 row in set (0.00 sec) Mysql> show global status like 'uptime ';+ --------------- + -------- +| Variable_name | Value |

1-w 448 k-t 600 The server displays the following information: [4] local 10.10.10.22 port 5001 connected with 10.10.11 port 56251 [ID] Interval Transfer Bandwidth [4] 0.0-1.0 sec 112 MBytes 941 Mbits/sec [4] 1.0-2.0 sec 112 MBytes 941 Mbits/sec [4] 2.0-3.0 sec