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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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V$PX_SESSION

V$PX_SESSION contains information about the sessions running parallel execution.

Column Datatype Description
SADDR RAW(4 | 8) Session address
SID NUMBER Session identifier
SERIAL# NUMBER Session serial number
QCSID NUMBER Session identifier of the parallel coordinator
QCSERIAL# NUMBER Session serial number of the parallel coordinator
QCINST_ID NUMBER Instance number on which the parallel coordinator is running
SERVER_GROUP NUMBER The logical group of servers to which this cluster database process belongs
SERVER_SET NUMBER The logical set of servers to which this cluster database process belongs. A single server group will have at most two server sets.
SERVER# NUMBER The logical number of the cluster database process within a server set
DEGREE NUMBER The degree of parallelism being used by the server set
REQ_DEGREE NUMBER The degree of parallelism that was requested by the user when the statement was issued and before any resource, multiuser, or load balancing reductions
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