Postgres逻辑备份脚本
昨天一个哥们说postgres的dump很难用，不尽然。下面 是利用Postgres自带的导出工具pg_dump来写的日常逻辑备份脚本，基本实现了每天自动备份，并保留一周时间。
环境：
CentOS 6.2
Postgres 9.1.3
1.整个库逻辑备份方案(相对较小)
#!/bin/bash
export PGHOME=/home/postgres
export PATH=$PGHOME/bin:$PATH
export PGDATA=/var/pgdata/
export BACKUP_DIR=/home/postgres/backup
export LANG=en_US.utf8
export DATE_1=`date +"%Y-%m-%d"`
export DATE_2=`date -d "-7 day" +"%Y-%m-%d"`
######################################################
##
## purpose:backup total database everyday logically
##
## author :kenyon
##
## created:2013-03-25
##
## restore_script:psql -d db_kenyon -U postgres < /home/postgres/backup/file_name
##
#####################################################
test -f $BACKUP_DIR/db_kenyon_back_$DATE_2
if [ $? -eq 0 ] ; then
rm -f $BACKUP_DIR/db_kenyon_back_$DATE_2
echo " `date +"%Y-%m-%d %H:%M:%S"` the file $BACKUP_DIR/db_kenyon_back_$DATE_2 has been moved"
fi
test -f $BACKUP_DIR/db_kenyon_back_$DATE_1
if [ $? -eq 0 ] ; then
echo "Today's(`date +"%Y-%m-%d %H:%M:%S"`) BACKUP job has done"
else
pg_dump -h 192.168.1.142 -p 5432 -U postgres -b -Fp db_kenyon -f $BACKUP_DIR/db_kenyon_back_$DATE_1
######check the dump file whether produced successfully
test -f $BACKUP_DIR/db_kenyon_back_$DATE_1
if [ $? -eq 0 ]; then
echo " `date +"%Y-%m-%d %H:%M:%S"` the database db_kenyon has been backuped to $BACKUP_DIR/db_kenyon_back_$DATE_1 successfully"
else
echo " `date +"%Y-%m-%d %H:%M:%S"` the pg_dump failed"
fi
fi
2.单表逻辑备份方案(表相对较大,下面采用的压缩级别为1级)
#!/bin/bash
export BACKUP_DIR=/home/postgres/backup
export DATE_1=`date +"%Y-%m-%d"`
export DATE_2=`date -d "-7 day" +"%Y-%m-%d"`
#############################################################################
##
## purpose:backup total database everyday logically
##
## author :kenyon
##
## created:2013-03-25
##
## restore_script: pg_restore -U postgres -Fc -d db_name tbl_user_20130218.bak
##
#############################################################################
source /home/postgres/.bash_profile
cd $BACKUP_DIR
if [ -d ./$DATE_2 ] ; then
rm -rf $BACKUP_DIR/$DATE_2
echo " `date +"%Y-%m-%d %H:%M:%S"` the file $BACKUP_DIR/$DATE_2 has been moved"
fi
if [ -d ./$DATE_1 ] ; then
echo "Today's(`date +"%Y-%m-%d %H:%M:%S"`) BACKUP job has done"
else
mkdir -p $BACKUP_DIR/$DATE_1
##### With compress level 1 dump out relation tables ############################
pg_dump -p 5432 -U postgres db_kenyon -Fc -Z 1 -t tbl_user -f $BACKUP_DIR/$DATE_1/tbl_user_$DATE_1.bak
pg_dump -p 5432 -U postgres db_kenyon -Fc -Z 1 -t tbl_company -f $BACKUP_DIR/$DATE_1/tbl_company_$DATE_1.bak
pg_dump -p 5432 -U postgres db_kenyon -Fc -Z 1 -t tbl_report_mon -f $BACKUP_DIR/$DATE_1/tbl_report_mon_$DATE_1.bak
pg_dump -p 5432 -U postgres db_kenyon -Fc -Z 1 -t tbl_report_daily -f $BACKUP_DIR/$DATE_1/tbl_report_daily_$DATE_1.bak
echo "Today's(`date +"%Y-%m-%d %H:%M:%S"`) BACKUP job has fineshed"
fi
3.Copy做增量备份 (时间或者ID)
psql -d db_kenyon -c"copy (select * from schema_name.table_name where crt_time>=$date) to '/home/postgres/tbl.bak'"
psql -d db_kenyon -c"copy (select * from schema_name.table_name where id>=$id) to '/home/postgres/tbl.bak'"
4.crontab定时调度
50 1 * * * sh /home/postgres/script/DB_backup.sh >> /home/postgres/backup/backup.log 2>&1
5.说明
上述脚本相对简单，还可以加入其它一些异常判断和邮件发送等。
