V_$SESSION_WAIT

V$SESSION_WAIT

V$SESSION_WAIT displays the resources or events for which active sessions are waiting.

The following are tuning considerations:

• P1RAW, P2RAW, and P3RAW display the same values as the P1, P2, and P3 columns, except that the numbers are displayed in hexadecimal.
• The WAIT_TIME column contains a value of -2 on platforms that do not support a fast timing mechanism. If you are running on one of these platforms and you want this column to reflect true wait times, then you must set the TIMED_STATISTICS initialization parameter to true. Remember that doing this has a small negative effect on system performance.
  In previous releases, the WAIT_TIME column contained an arbitrarily large value instead of a negative value to indicate the platform did not have a fast timing mechanism.
• The STATE column interprets the value of WAIT_TIME and describes the state of the current or most recent wait.

Column	Datatype	Description
SID	NUMBER	Session identifier
SEQ#	NUMBER	Sequence number that uniquely identifies this wait. Incremented for each wait.
EVENT	VARCHAR2(64)	Resource or event for which the session is waiting See Also: Appendix C, "Oracle Wait Events"
P1TEXT	VARCHAR2(64)	Description of the first additional parameter
P1	NUMBER	First additional parameter
P1RAW	RAW(4)	First additional parameter
P2TEXT	VARCHAR2(64)	Description of the second additional parameter
P2	NUMBER	Second additional parameter
P2RAW	RAW(4)	Second additional parameter
P3TEXT	VARCHAR2(64)	Description of the third additional parameter
P3	NUMBER	Third additional parameter
P3RAW	RAW(4)	Third additional parameter
WAIT_CLASS_ID	NUMBER	Identifier of the wait class
WAIT_CLASS#	NUMBER	Number of the wait class
WAIT_CLASS	VARCHAR2(64)	Name of the wait class
WAIT_TIME	NUMBER	A nonzero value is the session's last wait time. A zero value means the session is currently waiting.
SECONDS_IN_WAIT	NUMBER	If WAIT_TIME = 0, then SECONDS_IN_WAIT is the seconds spent in the current wait condition. If WAIT_TIME > 0, then SECONDS_IN_WAIT is the seconds since the start of the last wait, and SECONDS_IN_WAIT - WAIT_TIME / 100 is the active seconds since the last wait ended.
STATE	VARCHAR2(19)	Wait state: 0 - WAITING (the session is currently waiting) -2 - WAITED UNKNOWN TIME (duration of last wait is unknown) -1 - WAITED SHORT TIME (last wait <1/100th of a second) >0 - WAITED KNOWN TIME (WAIT_TIME = duration of last wait)