SID

NUMBER

Session identifier; maps to V$SESSION.SID

SEQ#

NUMBER

A number that uniquely identifies the current or last wait (incremented for each wait)

EVENT

VARCHAR2(64)

If the session is currently waiting, then the resource or event for which the session is waiting. If the session is not in a wait, then the resource or event for which the session most recently waited.

See Also: "Oracle Wait Events"

P1TEXT

VARCHAR2(64)

Description of the first wait event parameter

P1

NUMBER

First wait event parameter (in decimal)

P1RAW

RAW(8)

First wait event parameter (in hexadecimal)^Foot 1

P2TEXT

VARCHAR2(64)

Description of the second wait event parameter

P2

NUMBER

Second wait event parameter (in decimal)

P2RAW

RAW(8)

Second wait event parameter (in hexadecimal)^Foot 1

P3TEXT

VARCHAR2(64)

Description of the third wait event parameter

P3

NUMBER

Third wait event parameter (in decimal)

P3RAW

RAW(8)

Third wait event parameter (in hexadecimal)^Foot 1

WAIT_CLASS_ID

NUMBER

Identifier of the class of the wait event

WAIT_CLASS#

NUMBER

Number of the class of the wait event

WAIT_CLASS

VARCHAR2(64)

Name of the class of the wait event

WAIT_TIME

NUMBER

If the session is currently waiting, then the value is 0. If the session is not in a wait, then the value is as follows:

• > 0 - Value is the duration of the last wait in hundredths of a second

• -1 - Duration of the last wait was less than a hundredth of a second

• -2 - Parameter TIMED_STATISTICS was set to false

This column has been deprecated in favor of the columns WAIT_TIME_MICRO and STATE.

SECONDS_IN_WAIT

NUMBER

If the session is currently waiting, then the value is the amount of time waited for the current wait. If the session is not in a wait, then the value is the amount of time since the start of the last wait.

This column has been deprecated in favor of the columns WAIT_TIME_MICRO and TIME_SINCE_LAST_WAIT_MICRO.

STATE

VARCHAR2(19)

Wait state:

• WAITING - Session is currently waiting

• WAITED UNKNOWN TIME - Duration of the last wait is unknown; this is the value when the parameter TIMED_STATISTICS is set to false

• WAITED SHORT TIME - Last wait was less than a hundredth of a second

• WAITED KNOWN TIME - Duration of the last wait is specified in the WAIT_TIME column

WAIT_TIME_MICRO

NUMBER

Amount of time waited (in microseconds). If the session is currently waiting, then the value is the time spent in the current wait. If the session is currently not in a wait, then the value is the amount of time waited in the last wait.

TIME_REMAINING_MICRO

NUMBER

Value is interpreted as follows:

• > 0 - Amount of time remaining for the current wait (in microseconds)

• 0 - Current wait has timed out

• -1 - Session can indefinitely wait in the current wait

• NULL - Session is not currently waiting

TOTAL_TIME_WAITED_MICRO^Foot 2

NUMBER

Total time for the current wait (in microseconds)

A wait includes code within its beginning and end that can encounter other waits as part of its implementation. For example, a wait might need to acquire a latch to check state to determine when the wait is satisfied, and the latch itself might enter a wait. In this case, when the latch wait ends and returns to the outer wait, the latch time is included in the value of this column, while the value of WAIT_TIME_MICRO is reset to start after the latch wait.

HEUR_TIME_WAITED_MICRO^Foot 2

NUMBER

Heuristic wait time (in microseconds)

This value is calculated by attempting to group sequential waits that appear to be the same.

TIME_SINCE_LAST_WAIT_MICRO

NUMBER

Time elapsed since the end of the last wait (in microseconds). If the session is currently in a wait, then the value is 0.

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