1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$ACCESS to V$HVMASTER_INFO
  4. V$HANG_SESSION_INFO

7.254 V$HANG_SESSION_INFO

V$HANG_SESSION_INFO displays information about sessions involved in hangs described by V$HANG_INFO.

Each row with the same HANG_ID describes a session that is in the hang wait chain described by the row with the same HANG_ID in V$HANG_INFO. This session is blocked by the victim or final blocker of that hang.

Column Datatype Description

HANG_ID

NUMBER

A number identifying the hang including this session. This column can be used to join V$HANG_INFO with V$HANG_SESSION_INFO.

INSTANCE

NUMBER

Instance number of the instance on which this session resides

SID

NUMBER

Oracle session ID of this session

SERIAL#

NUMBER

Oracle session serial number of this session

OSPID

VARCHAR2(24)

Operating system process ID of this session

FATAL_BACKGROUND

VARCHAR2(1)

Y - Session is a critical background process

N - Session is not a critical background process

ROOT

VARCHAR2(1)

Y - This session is the victim or final blocker of the hang

N - This session is not the victim or final blocker of the hang

PNAME

VARCHAR2(5)

Name of the victim or final blocker process

WAIT_EVENT_TEXT

VARCHAR2(64)

Resource or event for which this session is waiting; set to not in a wait if the session is not waiting on a resource

QOS_PC_RANK

VARCHAR2(12)

Session's Oracle Database Quality of Service (QoS) Management Performance Class rank

See Oracle Database Quality of Service Management User's Guide for more information about Oracle Database QoS Management.

QOS_PC_ITT

NUMBER

Session's Oracle Database Quality of Service (QoS) Management Performance Class In-Trouble Threshold

QOS_PC_RTT

NUMBER

Session's Oracle Database Quality of Service (QoS) Management Performance Class Root Termination allowed Threshold

QOS_PC_KEY

NUMBER

Session's Oracle Database Quality of Service (QoS) Management Performance Class Key

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data

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