storage engine, allow MySQL to handle locked processing directly to the storage engine itself, holding only write_allow_ in MySQL The lock of the write type.
Since the locking mechanism used by the MyISAM storage engine is entirely a table-level lock provided by MySQL, we will use the MyISAM storage engine as the sample storage engine to illustrate some of the basic features of table-level locking. Because, in order to make the example more intuitive, I'll use the display to add a lock to the
Original: SQL Server R2 Performance counter detailed list (i)SQL Server Backup Device counters:Can monitor the Microsoft SQL Server backup device for backup and restore operations
SQL Server Backup Device counters
Description
Device Throughput Bytes/sec
The throughput (in bytes per second) of the read and write operations used by a backup device to back up or restore the database. Th
The IIS Global active flushed Entries active flushed Entries is a cached file handle that closes after the current transfer is complete. The IIS Global object.Web Anonymous users/sec The number of anonymous connections that users make through the Web service.the number of BLOB cache refreshes that IIS Global blob cache flushes since the server started.Total number of successful lookups in the IIS Global blob cache Hits blob caches.IIS Global blob cach
table2.4.2 alter Modify table (column) field2.4.3 Delete drop table (column) field2.4.4 Rename renaming table names2.5 Create new table with existing data3. Operation and management of data3.1 Add data (Increase)3.2 Deleting data (delete)3.3 Modifying data (change)3.4 Query data (check)4. Management view1. Database management1.1 CREATE Database
Create Database Firstdb;
1.2 Show view all databases
mysql> show databases;
+--------------------+
| Database |
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
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
Guidance:
Memory: memory usage may be the most important factor in system performance. If the system frequently switches pages, the memory is insufficient. "Page Swap" is a unit called "page". It moves code and data blocks of a fixed size from Ram to a disk to release memory space. Although some page switches enable Windows 2000 to use more memory than actually, they are acceptable, but frequent page exchanges will reduce system performance. Reducing page switching significantly increases the sy
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