Alter session set current_schema for Setting Default Schema from Different Schema in Oracle

I will explain Alter session set current_schema for Switching to a Different Schema in Oracle in this post.

 

Alter session set current_schema

 

When you run any SQL Statement, you can get the following error.

ORA-02421 missing or invalid schema authorization identifier.


SQL> select count(*) from employees;
select count(*) from employees
*
ERROR at line 1:
ORA-00942: table or view does not exist

 

 

 

Setting Default Schema in Oracle

If you run any SQL statements which schema is different and object name is used without Schema name, you can get this error.

 

To solve this error, you should change current_schema to tables owner schema as follows.

ALTER SESSION SET CURRENT_SCHEMA = <schema name>


ALTER SESSION SET CURRENT_SCHEMA = MEHMET;
ALTER SESSION SET CURRENT_SCHEMA = SCOOT;
ALTER SESSION SET CURRENT_SCHEMA = MSDBA;



Then you can run any sql statement without Schema name as follows.

ALTER SESSION SET CURRENT_SCHEMA = HR;



SQL> select count(*) from employees;

COUNT(*)
----------
106

SQL>

 

 

 

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

Oracle Database Tutorials for Beginners ( Junior Oracle DBA )

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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 [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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