SAMPLE_ID

NUMBER

ID of the sample

SAMPLE_TIME

TIMESTAMP(3)

Time at which the sample was taken

SESSION_ID

NUMBER

Session identifier; maps to V$SESSION.SID

SESSION_SERIAL#

NUMBER

Session serial number (used to uniquely identify a session's objects); maps to V$SESSION.SERIAL#

USER_ID

NUMBER

Oracle user identifier; maps to V$SESSION.USER#

SQL_ID

VARCHAR2(13)

SQL identifier of the SQL statement that the session was executing at the time of sampling

SQL_CHILD_NUMBER

NUMBER

Child number of the SQL statement that the session was executing at the time of sampling

SQL_PLAN_HASH_VALUE

NUMBER

Numerical representation of the SQL plan for the cursor. This information might not be available for all session samples. V$SESSION does not contain this information.

FORCE_MATCHING_SIGNATURE

NUMBER

The signature used when the CURSOR_SHARING parameter is set to FORCE

SQL_OPCODE

NUMBER

Indicates what phase of operation the SQL statement was in; maps to V$SESSION.COMMAND

See Also: "V$SESSION" for information on interpreting this column

SERVICE_HASH

NUMBER

Hash that identifies the Service; maps to V$ACTIVE_SERVICES.NAME_HASH

SESSION_TYPE

VARCHAR2(10)

Session type:

·         FOREGROUND

·         BACKGROUND

SESSION_STATE

VARCHAR2(7)

Session state:

·         WAITING

·         ON CPU

QC_SESSION_ID

NUMBER

Query coordinator session ID. This information is only available if the sampled session is a parallel query slave. For all other sessions, the value is 0.

QC_INSTANCE_ID

NUMBER

Query coordinator instance ID. This information is only available if the sampled session is a parallel query slave. For all other sessions, the value is 0.

BLOCKING_SESSION

NUMBER

Session identifier of the blocking session. Populated only when the session was waiting for enqueues or a "buffer busy" wait. Maps to V$SESSION.BLOCKING_SESSION.

BLOCKING_SESSION_STATUS

VARCHAR2(11)

Status of the blocking session:

·         VALID

·         NO HOLDER

·         GLOBAL

·         NOT IN WAIT

·         UNKNOWN

BLOCKING_SESSION_SERIAL#

NUMBER

Serial number of the blocking session

EVENT

VARCHAR2(64)

If SESSION_STATE = WAITING, then the event for which the session was waiting for at the time of sampling.

If SESSION_STATE = ON CPU, then this column will be NULL.

See Also: Appendix C, "Oracle Wait Events"

EVENT_ID

NUMBER

Identifier of the resource or event for which the session is waiting or for which the session last waited. Interpretation is similar to that of the EVENT column.

EVENT#

NUMBER

Number of the resource or event for which the session is waiting or for which the session last waited. Interpretation is similar to that of the EVENT column.

SEQ#

NUMBER

Sequence number that uniquely identifies the wait (incremented for each wait)

P1TEXT

VARCHAR2(64)

Text of first additional parameter

P1

NUMBER

First additional parameter

P2TEXT

VARCHAR2(64)

Text of second additional parameter

P2

NUMBER

Second additional parameter

P3TEXT

VARCHAR2(64)

Text of third additional parameter

P3

NUMBER

Third additional parameter

WAIT_CLASS

VARCHAR2(64)

Wait class name of the event for which the session was waiting at the time of sampling. Interpretation is similar to that of the EVENT column. Maps to V$SESSION.WAIT_CLASS.

WAIT_CLASS_ID

NUMBER

Wait class identifier of the event for which the session was waiting at the time of sampling. Interpretation is similar to that of the EVENT column. Maps to V$SESSION.WAIT_CLASS_ID.

WAIT_TIME

NUMBER

0 if the session was waiting at the time of sampling

Total wait time for the event for which the session last waited if the session was on the CPU when sampled

Whether or not WAIT_TIME = 0 is what is useful to find the SESSION_STATE at the time of sampling, rather than the actual value of WAIT_TIME itself. Maps to V$SESSION.WAIT_TIME.

TIME_WAITED

NUMBER

If SESSION_STATE = WAITING, then the time that the session actually spent waiting for that EVENT. This column is set for waits that were in progress at the time the sample was taken.

If a wait event lasted for more than a second and was caught waiting in more than one session sample row, then the actual time spent waiting for that wait event will be populated in the last of those session sample rows. At any given time, this information will not be available for the latest session sample.

XID

RAW(8)

Transaction ID that the session was working on at the time of sampling. V$SESSION does not contain this information.

CURRENT_OBJ#

NUMBER

Object ID of the object that the session is referencing. This information is only available if the session was waiting for Application, Cluster, Concurrency, and User I/O wait events. Maps to V$SESSION.ROW_WAIT_OBJ#.

CURRENT_FILE#

NUMBER

File number of the file containing the block that the session is referencing. This information is only available if the session was waiting for Cluster, Concurrency, and User I/O wait events. Maps to V$SESSION.ROW_WAIT_FILE#.

CURRENT_BLOCK#

NUMBER

ID of the block that the session is referencing. This information is only available if the session was waiting for Cluster, Concurrency, and User I/O wait events. Maps to V$SESSION.ROW_WAIT_BLOCK#.

PROGRAM

VARCHAR2(48)

Name of the operating system program

MODULE

VARCHAR2(48)

Name of the executing module when sampled, as set by the DBMS_APPLICATION_INFO.SET_MODULE procedure

ACTION

VARCHAR2(32)

Name of the executing module when sampled, as set by the DBMS_APPLICATION_INFO.SET_ACTION procedure

CLIENT_ID

VARCHAR2(64)

Client identifier of the session; maps to V$SESSION.CLIENT_IDENTIFIER