ORA-01081: cannot start already-running ORACLE – shut it down first

Hi,

Sometimes you can get ” ORA-01081: cannot start already-running ORACLE – shut it down first ” error.

Details of error are as follows.

SQL> startup      
ORA-01081: cannot start already-running ORACLE - shut it down first    


This errors means Oracle Instance is already opened, so you should make sure Oracle SID and Oracle Home.

Check the Oracle SID and Oracle Home, if they are Ok or not ?
[oracle@MSDBdbadm01:/home/oracle:> echo $ORACLE_SID

[oracle@MSDBdbadm01:/home/oracle:> echo $ORACLE_HOME

Compare Oracle SID and Oracle home from oratab file. oratab files are exist under the following paths.

/etc/oratab

/var/opt/oracle/oratab
If they are not set correctly, then set them as follows.
Unix/Linux :
[oracle@MSDBdbadm01:/home/oracle:> ORACLE_SID=INSTANCE_NAME

[oracle@MSDBdbadm01:/home/oracle:> export ORACLE_SID

[oracle@MSDBdbadm01:/home/oracle:> export ORACLE_HOME=/u01/app/product/12.2.0/dbhome_1

[oracle@MSDBdbadm01:/home/oracle:> sqlplus / as sysdba

Or shutdown abort the Instance then start it up again as follows.

SQL> startup
ORACLE instance started.

Total System Global Area 188743680 bytes
Fixed Size 1218412 bytes
Variable Size 67111060 bytes
Database Buffers 113246208 bytes
Redo Buffers 7168000 bytes
Database mounted.
Database opened.
SQL>

 

Oracle Home and Oracle SID must set properly every time.

 

Do you want to learn Oracle Database for Beginners, then read the following articles.

https://ittutorial.org/oracle-database-19c-tutorials-for-beginners/

 

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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience. I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource. I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks. I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients. If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress mehmetsalih.deveci@outlook.com. -                                                                                                                                                                                                                                                 - Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  mehmetsalih.deveci@outlook.com a mail atabilirsiniz.

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