make_time(hour int, min int, sec double precision)函数通过指定小时、分钟和秒数创建一个时间 SELECTmake_time(1,2,30.5);--01:02:30 make_timestamp(year int, month int, day int, hour int, min int, sec double precision)函数通过指定年、月、日、时、分、秒创建一个时间戳 SELECTmake_timestam...
make_date(year int, month int, day int) 函数用于创建一个日期: SELECT make_date(2020, 03, 15); make_date | ---| 2020-03-15| make_interval(years int DEFAULT 0, months int DEFAULT 0, weeks int DEFAULT 0, days int DEFAULT 0, hours int DEFAULT 0, mins int DEFAULT 0, secs double...
wget http://ftp.postgresql.org/pub/source/v15.6/postgresql-15.6.tar.gzsleep3 yum -y install perl-ExtUtils-Embed readline-devel zlib-devel pam-devel libxml2-devel libxslt-devel openldap-devel python-devel gcc-c++ openssl-devel cmakesleep3 tar xvf postgresql-15.6.tar.gzmvpostgresql-15.6 /usr/...
使用pgbouncer可以控制住数据库上的活动连接,一般配置为CPU核数的1.5-2.5倍之间。 pgbouncer使用libevent进行socket通信,效率很高。 PgBouncer部署 · Pgbouncer 安装 1、安装libevent(root用户): /soft/libevent-2.1.12-stable ./configure --prefix=/usr/local/libevent make makeinstall 2、安装pgbouncer (postgres...
heap_compute_data_sizeif(ATT_IS_PACKABLE(atti)&&VARATT_CAN_MAKE_SHORT(DatumGetPointer(val)))data_length+=VARATT_CONVERTED_SHORT_SIZE(DatumGetPointer(val));
/configure --prefix=/postgresql/pg16 make -j 8 && make install make world -j 8 && make install-world -- 配置环境变量 cat >> ~/.bash_profile <<"EOF" export LANG=en_US.UTF-8 export PS1="[\u@\h \W]\$ " export PGPORT=5432 export PGDATA=/postgresql/pgdata export PGHOME=/...
current_date→ date当前日期 current_date→ 2019-12-23 current_time→ time with time zone一天中的当前时间 current_time→ 14:39:53.662522-05 current_time ( integer ) → time with time zone 一天中的当前时间;有限精度 current_time(2)→ 14:39:53.66-05 current_timestamp→ timestamp with time ...
make && make install · Pgbouncer 配置 1、创建/usr/local/pgbouncer/conf目录,把pgbouncer.ini文件放在此目录下 2、复制模板文件 cp /usr/local/pgbouncer/share/doc/pgbouncer/pgbouncer.ini /usr/local/pgbouncer/conf/pgbouncer.ini 3、编辑pgbouncer.ini文件 logfile = /var/log/pgbouncer/pgbouncer.log #目录...
make[1]: 进入目录“/install/postgresql-16.3/src/backend” make -C catalog distprep generated-header-symlinks make[1]: 进入目录“/install/postgresql-16.3/src/backend” make -C catalog distprep generated-header-symlinks make[2]: 进入目录“/install/postgresql-16.3/src/backend/catalog” make[2]:...
SELECT current_date + floor((random() * 15))::int rand_date; rand_date | ---| 2020-11-04| 1. 2. 3. 4. 以上示例返回了当前日期 14 天之内的某个随机日期。以下语句则返回了一天中的某个随机时间: SELECT make_time(floor((random() * 12))::int, floor((random() * 60))::int, fl...