postgreSQL pgBouncer安装配置 下载地址:http://pgfoundry.org/frs/?group_id=1000258release_id=1981 1.安装步骤: $ ./configure --prefix=/usr/local --with-libevent=libevent-prefix $ make $ make install 如果没有libevent,那么http://monkey.org/~
postgreSQL pgBouncer安装配置
下载地址:http://pgfoundry.org/frs/?group_id=1000258&release_id=1981
1.安装步骤:
$ ./configure --prefix=/usr/local --with-libevent=libevent-prefix
$ make
$ make install
如果没有libevent,那么http://monkey.org/~provos/libevent/下载
Libevent安装:
$ ./configure && make
$ make verify
# make install 注意安装时用root用户
tail -1f config.log
configure: exit 0 0说明安装成功,1为失败
2.创建配置文件:
Mkdir –p $PGDATA/pgbouncer
postgres@readerlogdb-> more config.ini
[databases]
testdb = host=127.0.0.1 port=1931 dbname=testdb user=testuser password=testuser
[pgbouncer]
listen_port = 1688
listen_addr = 127.0.0.1
auth_type = md5
auth_file = /opt/pgdata/pg_root/pgbouncer/user.txt
logfile = /opt/pgdata/pg_root/pgbouncer/pgbouncer.log
pidfile = /opt/pgdata/pg_root/pgbouncer/pgbouncer.pid
pool_mode = Transaction
admin_users = pgbouncer_admin
stats_users = pgbouncer_guest
3.添加用户信息
more user.txt
"testuser" "testuser"
"pgbouncer_admin" "pgbouncer_admin"
4.启动pgbouncer
pgbouncer -d /opt/pgdata/pg_root/pgbouncer/config.ini
5.测试连接
psql -h 127.0.0.1 -p 1688 -d testdb -U testuser #testuser用户连接testdb
psql -h 127.0.0.1 -p 1688 -d pgbouncer -U pgbouncer_admin #以pgbouncer管理用户进入本身的数据库pgbouncer
6.查看相关信息
pgbouncer=# show help;
NOTICE: Console usage
DETAIL:
SHOW HELP|CONFIG|DATABASES|POOLS|CLIENTS|SERVERS|VERSION
SHOW STATS|FDS|SOCKETS|ACTIVE_SOCKETS|LISTS|MEM
SHOW DNS_HOSTS|DNS_ZONES
SET key = arg
RELOAD
PAUSE [
RESUME [
KILL
SUSPEND
SHUTDOWN
Show config; #查看相关配置
Show stats;
Show lists;#查看连接相关信息,如,数据库个数,空闲连接数等等
Show pools;#查看池中连接信息
Show databases;#查看相关数据库
Show clients; #查看连接数
如果修改了配置文件,那么需要reload重新加载
pgbouncer=# reload;
RELOAD
连接方式有三种,之前介绍过,种类不再详述,以上 一些参数的介绍,在源安装包里doc目录下有详细说明和举例。

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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