Find Sessions that are Blocking Other Sessions Using SQL
(Doc ID 728539.1)
Last updated on MARCH 18, 2020
Applies to:Oracle Database - Personal Edition - Version 22.214.171.124 and later
Oracle Database - Standard Edition - Version 126.96.36.199 and later
Enterprise Manager for Oracle Database - Version 188.8.131.52 and later
Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.
Sometimes a systemstate cannot be taken and uploaded to support, and it is desirable to manually find what sessions are blocking other sessions. This guide enables the 'blocking' session to be ascertained manually.
The note is written only with currently supported versions in mind 10G and onwards. Therefore, while some of the methodology applies to 9.2 and below, it cannot be guaranteed.
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