4.314 DBA_HIST_EVENT_HISTOGRAM

DBA_HIST_EVENT_HISTOGRAM displays event histogram historical statistics information.

This view contains snapshots of V$EVENT_HISTOGRAM.

Column Datatype NULL Description

SNAP_ID

NUMBER

NOT NULL

Unique snapshot ID

DBID

NUMBER

NOT NULL

Database ID for the snapshot

INSTANCE_NUMBER

NUMBER

NOT NULL

Instance number for the snapshot

EVENT_ID

NUMBER

NOT NULL

Identifier of the wait event

EVENT_NAME

VARCHAR2(64)

NOT NULL

Name of the wait event

WAIT_CLASS_ID

NUMBER

Identifier of the class of the wait event

WAIT_CLASS

VARCHAR2(64)

Name of the class of the wait event

WAIT_TIME_MILLI

NUMBER

NOT NULL

Wait time (in milliseconds)

WAIT_COUNT

NUMBER

Wait count

CON_DBID

NUMBER

The database ID of the PDB for the sampled session

CON_ID

NUMBER

The ID of the container that CON_DBID identifies. 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

See Also:

"V$EVENT_HISTOGRAM"