Find Sessions that are Blocking Other Sessions Using SQL
Last updated on SEPTEMBER 29, 2017
Applies to:Oracle Database - Personal Edition - Version 220.127.116.11 and later
Oracle Database - Standard Edition - Version 18.104.22.168 and later
Enterprise Manager for Oracle Database - Version 22.214.171.124 and later
Oracle Database - Enterprise Edition - Version 126.96.36.199 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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