ORA-01436: CONNECT BY loop in user data

I got ” ORA-01436: CONNECT BY loop in user data ”  error in Oracle database.

 

ORA-01436: CONNECT BY loop in user data

 

Details of error are as follows.

ORA-01436: CONNECT BY loop in user data

Cause: The condition specified in a CONNECT BY clause caused a loop in the query, where the next 
record to be selected is a descendent of itself. When this happens, there can be no end to the query.

Action: Check the CONNECT BY clause and remove the circular reference.

 

 

 

Obsolete and/or deprecated parameter(s) specified.

This ORA-32004 error is related with the condition specified in a CONNECT BY clause caused a loop in the query, where the next record to be selected is a descendent of itself. When this happens, there can be no end to the query.

Check the CONNECT BY clause and remove the circular reference.

 

To solve this error, add the NOCYCLE parameter in the CONNECT BY condition as follows.

CONNECT BY NOCYCLE PRIOR 

When you run the following query, you will get this error.

SELECT * FROM TEST_TABLE
START WITH id1=1
CONNECT BY PRIOR id1=id2;

ORA-01436: CONNECT BY loop in user data

 

Then add NOCYCLE clause and solve it as follows.

SELECT id1,id2
FROM TEST_TABLE
START WITH id1=1
CONNECT BY NOCYCLE PRIOR id1=id2;

 

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

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )

 

 647 views last month,  3 views today

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.

Leave a Reply