在Oracle21c之后，一些目录发生了变化，如监听配置文件、dbs目录。 示例如下： Oracle21c安装之后，目录如下 ```shell #$ORACLE_BASE目录下 admin audit cfgtoollogs dbs diag homes oradata product [oracle@oracle21 oracle]$ pwd /u01/app/oracle # 19c $ORACLE_BASE目录下。ASM [oracle@rac19c oracle]$ ls admin audit cfgtoollogs checkpoints diag product #检查Oracle21c目录 [oracle@oracle21 oracle]$ orabasehome /u01/app/oracle/homes/OraDB21Home1 [oracle@oracle21 oracle]$ orabaseconfig /u01/app/oracle [oracle@oracle21 oracle]$ #检查19c目录 [oracle@rac19c ~]$ orabasehome /u02/app/oracle/product/19.0.0/db_1 [oracle@rac19c ~]$ orabaseconfig /u02/app/oracle/product/19.0.0/db_1 [oracle@rac19c ~]$ orabase /u02/app/oracle [oracle@rac19c ~]$ #检查21c监听状态及文件位置,如下所示，已经在/homes/OraDB21Home1/network/admin/listener.ora目录下，配置tnsnames也需要在该目录下 [oracle@oracle21 oracle]$ lsnrctl stat LSNRCTL for Linux: Version 21.0.0.0.0 - Production on 20-AUG-2021 13:52:09 Copyright (c) 1991, 2021, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle21)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 21.0.0.0.0 - Production Start Date 20-AUG-2021 13:33:24 Uptime 0 days 0 hr. 18 min. 45 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /u01/app/oracle/homes/OraDB21Home1/network/admin/listener.ora Listener Log File /u01/app/oracle/diag/tnslsnr/oracle21/listener/alert/log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle21)(PORT=1521))) (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521))) Services Summary... Service "c8209f27c6b16005e053362ee80ae60e" has 1 instance(s). Instance "mydb21", status READY, has 1 handler(s) for this service... Service "c9e6ddb27463ad21e0531550a8c0a46d" has 1 instance(s). Instance "mydb21", status READY, has 1 handler(s) for this service... Service "mydb21" has 1 instance(s). Instance "mydb21", status READY, has 1 handler(s) for this service... Service "mydb21XDB" has 1 instance(s). Instance "mydb21", status READY, has 1 handler(s) for this service... Service "mypdb21" has 1 instance(s). Instance "mydb21", status READY, has 1 handler(s) for this service... The command completed successfully [oracle@oracle21 oracle]$ ``` 检查数据库中一些信息 ``` sql --检查spfile文件,已不在原来的ORACLE_HOME目录下 SQL> show parameter spfile NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ spfile string /u01/app/oracle/dbs/spfilemydb21.ora SQL> ``` 虽然Oracle21c中想变化为只读目录，但目前查看目录权限，仍然可写。 权限如下： ``` shell SQL> Disconnected from Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production Version 21.3.0.0.0 [oracle@oracle21 oracle]$ pwd /u01/app/oracle [oracle@oracle21 oracle]$ ls -lrt total 32 drwxr-xr-x. 3 oracle oinstall 4096 Aug 19 16:18 product drwxrwxr-x. 23 oracle oinstall 4096 Aug 19 16:35 diag drwxr-x---. 3 oracle oinstall 4096 Aug 19 16:35 homes drwxr-x---. 5 oracle oinstall 4096 Aug 19 16:42 cfgtoollogs drwxr-x---. 3 oracle oinstall 4096 Aug 19 16:53 admin drwxr-x---. 3 oracle oinstall 4096 Aug 19 16:53 oradata drwxr-x---. 3 oracle oinstall 4096 Aug 19 16:55 audit drwxr-x---. 2 oracle oinstall 4096 Aug 20 13:53 dbs [oracle@oracle21 oracle]$ ``` 目前Oracle21c已经将一些目录分离出来，权限管理可以越来越细化，更好保障数据库的安全，后续继续测试。 目录变更可参考： - http://blog.itpub.net/29487349/viewspace-2787818/ - https://docs.oracle.com/en/database/oracle/oracle-database/21/ladbi/index.html