PostgreSQL是一个功能非常强大的、源代码开放的客户/服务器关系型数据库管理系统(RDBMS)。支持丰富的数据类型(如JSON和JSONB类型,数组类型)和自定义类型。PostgreSQL内存页面的默认大小是8kB。
PostgreSQL有以下主要特性:
1良好支持SQL语言,支持ACID、关联完整性、数据库事务、Unicode多国语言。
2高并发设计,读和写互不阻塞
3 支持大量类型的数据库模型:关系型,文档型(如JSON和JSONB类型,数组类型),Key/value类型。
Yum install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
yum list postgresql11-server.x86_64
yum list postgresql11.x86_64
/ usr / pgsql-11 / bin / postgresql-11-setup initdb
systemctl enable postgresql-11
systemctl start postgresql-11
gcc, bison, gcc-c++, readline, readline-devel, zlib, zlib-devel
yum install *gcc* -y
[root@Redhat7 ~]# yum install *bison* -y
[root@Redhat7 ~]# yum install *readline* -y
[root@Redhat7 ~]# yum install *zlib* -y
ulimit 功 能:控制shell程序的资源
在Linux下面部署应用的时候,有时候会遇上Socket/File: Can’t open so many files的问题;这个值也会影响服务器的最大并发数,其实Linux是有文件句柄限制的,而且Linux默认不是很高,一般都是1024,生产服务器用其实很容易就达到这个数量。下面说的是,如何通过正解配置来改正这个系统默认值。
/etc/security/limits.conf
soft nproc :单个用户可用的最大进程数量(超过会警告);
hard nproc:单个用户可用的最大进程数量(超过会报错);
soft nofile :可打开的文件描述符的最大数(超过会警告);
hard nofile :可打开的文件描述符的最大数(超过会报错);
# End of f11e
* soft nof1le 1024000
* hard nofile 1024000
* soft nproc 1024000
* hard nproc 1024000
[root@Redhat7 ~]# cat /etc/security/limits.d/20-nproc.conf
# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.
* soft nproc 4096
root soft nproc unlimited
修改成
* soft nproc 1024000
* hard nproc 1024000
root soft nproc unlimited
[root@Redhat7 ~]# useradd postgres
[root@Redhat7 ~]# mkdir /opt/pgsql11.4 创建PG家目录
[root@Redhat7 ~]# mkdir /pgdb 创建PG数据目录
[root@Redhat7 ~]# chown -R postgres:postgres /opt/pgsql11.4/
[root@Redhat7 ~]# chown -R postgres:postgres /pgdb
[root@Redhat7 pgsql11.4]# tar -zxvf postgresql-11.4.tar.gz
[root@Redhat7 postgresql-11.4]# ./configure --prefix=/opt/pgsql11.4
make
make install
PostgreSQL installation complete.
口prefix= PREFIX --安装路径最常修改
口with- blocksize= BLOCKSIZE --数据库blocksize ,缺省8KB
OLAP场景下可以适当增加这个值到32kB,以提高OLAP的性能,但在OLTP场景下建议使用8kB默认值。
口with-segsize=SEGSIZE --表文件的段尺寸,缺省1GB
口with-llvm --使用基于JIT的Ivm编译
口--with-wal-blocksize=BLOCKSIZE: 指定WAL文件的块大小,默认是8kB。
口--with-wal-segsize=SEGSIZE: 指定单个WAL文件的大小,默认是16MB。
比较全的
vi /home/postgres/.bash_profile
添加内容:
export PGPORT=8432
export PGHOME=/usr/pgsql-11
export PGDATA=/mnt/db1/pgdata/pgsql
export PATH=$PGHOME/bin:$PATH
export MANPATH=$PGHOME/share/man:$MANPATH
export LANG=en_US.UTF-8
export DATE='date +"%Y%m%d%H%M"'
export LD_LIBRARY_PATH=$PGHOME/lib:$LD_LIBRARY_PATH
export PGHOST=$PGDATA
export PGUSER=postgres
可以使用的
PGHOME=/opt/pgsql11.4
export PGHOME
PGDATA=/pgdb
export PGDATA
export PATH=$PGHOME/bin:$PATH
export PATH
使用initdb命 令初始化数据库簇
一-D : database cluster的主目录
--E :数据库字符编码
--wal-segsize : WAL日志文件尺寸
- -U :指定超级用户
initdb -D /pgdb/
[postgres@RHCE7 ~]$ initdb -D /pgdb/
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.
The database cluster will be initialized with locale "zh_CN.UTF-8".
The default database encoding has accordingly been set to "UTF8".
initdb: could not find suitable text search configuration for locale "zh_CN.UTF-8"
The default text search configuration will be set to "simple".
Data page checksums are disabled.
fixing permissions on existing directory /pgdb ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default timezone ... PRC
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok
WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
Success. You can now start the database server using:
pg_ctl -D /pgdb/ -l logfile start
[postgres@RHCE7 ~]$ pg_ctl -D /pgdb/ -l logfile start
waiting for server to start.... done
server started
[root@RHCE7 ~]# vim /usr/lib/systemd/system/postgresql-11.service
[Unit]
Description=PostgreSQL database server
After=network.target
[Service]
Type=forking
User=postgres
Group=postgres
# Port number for server to listen on
Environment=PGPORT=5432
# Location of database directory
Environment=PGDATA=/pgdb/
# Where to send early-startup messages from the server (before the logging
# options of postgresql.conf take effect)
# This is normally controlled by the global default set by systemd
# StandardOutput=syslog
# Disable OOM kill on the postmaster
OOMScoreAdjust=-1000
#ExecStartPre=/opt/pgsql11.4/bin/postgresql-check-db-dir ${PGDATA}
ExecStart=/opt/pgsql11.4/bin/pg_ctl start -D ${PGDATA} -s -o "-p ${PGPORT}" -w -t 300
ExecStop=/opt/pgsql11.4/bin/pg_ctl stop -D ${PGDATA} -s -m fast
ExecReload=/opt/pgsql11.4/bin/pg_ctl reload -D ${PGDATA} -s
# Give a reasonable amount of time for the server to start up/shut down
TimeoutSec=300
[Install]
WantedBy=multi-user.target
[root@RHCE7 ~]# systemctl enable /usr/lib/systemd/system/postgresql-11.service
Init 6 重启测试
[root@RHCE7 ~]# systemctl status postgresql-11.service
● postgresql-11.service - PostgreSQL database server
Loaded: loaded (/usr/lib/systemd/system/postgresql-11.service; enabled; vendor preset: disabled)
Active: active (running) since 日 2019-09-15 00:37:04 CST; 3min 47s ago
Process: 936 ExecStart=/opt/pgsql11.4/bin/pg_ctl start -D ${PGDATA} -s -o -p ${PGPORT} -w -t 300 (code=exited, status=0/SUCCESS)
linux版的postgresql默认无法直接远程访问其数据库因此,需要修改postgreSQL数据库配置来实现远程访问。
具体操作如下:在postgresql.conf下面修改
在最后添加用户参数:
listen_address = ‘*’,注意不要被注释掉
启用密码验证
# password_encryption = md5 修改为 password_encryption = md5
修改pg_hba.conf文件的内容:
可访问的用户ip段
在文件末尾加入:host all all 0.0.0.0/0 trust
也可以host all all all trust
重启postgreSQL数据库:启动成功后,再在远程连接