oracle 版本升级12.2.0升级到18C整体思路

1、创建新版数据库路径
mkdir -p /u01/app/oracle/product/18.0.1/dbhome_1
2、设置各种环境变量
export ORACLE_HOME=/u01/app/oracle/product/18.0.1/dbhome_1
export PATH=$ORACLE_HOME/bin:$PATH
 
export LD_LIBRARY_PATH=$ORACLE_HOME/lib

3、使用新库的脚步下检查升级前环境

[oracle@localhost bin]$ java -jar /u01/app/oracle/product/18.0.1/dbhome_1/rdbms/admin/preupgrade.jar
INFORMATION - Container: PDBTEST is in: MOUNTED status and will not be processed unless opened.
==================
PREUPGRADE SUMMARY
==================
  /u01/app/oracle/cfgtoollogs/orcl/preupgrade/preupgrade.log
  /u01/app/oracle/cfgtoollogs/orcl/preupgrade/preupgrade_fixups.sql
  /u01/app/oracle/cfgtoollogs/orcl/preupgrade/postupgrade_fixups.sql

Execute fixup scripts across the entire CDB:

Before upgrade:

1. Execute preupgrade fixups with the below command
$ORACLE_HOME/perl/bin/perl -I$ORACLE_HOME/perl/lib -I$ORACLE_HOME/rdbms/admin $ORACLE_HOME/rdbms/admin/catcon.pl -l /u01/app/oracle/cfgtoollogs/orcl/preupgrade/ -b preup_orcl /u01/app/oracle/cfgtoollogs/orcl/preupgrade/preupgrade_fixups.sql

2. Review logs under /u01/app/oracle/cfgtoollogs/orcl/preupgrade/

After the upgrade:

1. Execute postupgrade fixups with the below command
$ORACLE_HOME/perl/bin/perl -I$ORACLE_HOME/perl/lib -I$ORACLE_HOME/rdbms/admin $ORACLE_HOME/rdbms/admin/catcon.pl -l /u01/app/oracle/cfgtoollogs/orcl/preupgrade/ -b postup_orcl /u01/app/oracle/cfgtoollogs/orcl/preupgrade/postupgrade_fixups.sql

2. Review logs under /u01/app/oracle/cfgtoollogs/orcl/preupgrade/

Preupgrade complete: 2019-10-27T06:36:24

4、使用以上生成的脚本在老库环境下下执行

5、在新库环境下执行DBUA
export ORACLE_HOME=/u01/app/oracle/product/18.0.1/dbhome_1
export PATH=$ORACLE_HOME/bin:$PATH
 
export LD_LIBRARY_PATH=$ORACLE_HOME/lib

cd $ORACLE_HOME/bin
dbua

注意：原库一定要配置TNS和Listener，要不然会报错

主、从容器中都要执行EXECUTE DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;
 

6、然后按提示一步一步执行就可以了