1.配置PDB tns，注意如果是rac，这个备份应该只写当前节点ip
如果是写scanip 可能会连接到其他节点，从而报无权限的问题
2.连接到各个pdb 创建专门的备份用户
alter session set container=pdb1；
创建用户 和备份目录 并赋权
create user backup identified by xxxx;
create directory expdir as '/oradata/backup/';
grant connect,resource,dba to backup;
grant read,write on directory expdir to backup;
3.统一的多pdb备份脚本
#!/bin/bash
#create by fan 20230209
PATH=$PATH:$HOME/bin
ORACLE_HOME=/u01/app/oracle/product/19.0.0.0/dbhome_1
ORACLE_SID=orcl
PATH=$ORACLE_HOME/bin:$PATH
export ORACLE_BASE ORACLE_HOME ORACLE_SID
export PATH
export BACKUPTIME=`date +%Y%m%d%H%M%S`
expdp backup/xxxxx@pdb1 directory = expdir dumpfile=pdb1$BACKUPTIME.dmp logfile=pdb1$BACKUPTIME.log full=y
expdp backup/xxxxx@pdb2 directory = expdir dumpfile=pdb2$BACKUPTIME.dmp logfile=pdb2$BACKUPTIME.log full=y
expdp backup/xxxxx@pdb3 directory = expdir dumpfile=pdb3$BACKUPTIME.dmp logfile=pdb3$BACKUPTIME.log full=y
##delete old dump
find /oradata/backup/ -mtime +7 -name *.dmp -exec rm -f {} ';'
find /oradata/backup/ -mtime +7 -name *.log -exec rm -f {} ';'
