Users' questions

What is top event P1 P2 P3 values?

What is top event P1 P2 P3 values?

The Top Event P1/P2/P3 subsection lists the wait event parameter values of the top wait events that accounted for the highest percentages of sampled session activity, ordered by the percentage of total wait time (% Event).

How do I find the Oracle session ID?

4 Answers

  1. SELECT SID, SERIAL# FROM V$SESSION WHERE AUDSID = Sys_Context(‘USERENV’, ‘SESSIONID’);
  2. SELECT SID, SERIAL# FROM GV$SESSION WHERE AUDSID = Sys_Context(‘USERENV’, ‘SESSIONID’) AND INST_ID = USERENV(‘Instance’);
  3. select sid from v$mystat where rownum=1;

What is GV session in Oracle?

V$SESSION displays session information for each current session. Used to uniquely identify a session’s objects. Guarantees that session-level commands are applied to the correct session objects if the session ends and another session begins with the same session ID.

What is Last_call_et in V session in Oracle?

Answer: According to Oracle, the last_call_et column of v$session “represents the elapsed time (in seconds) since the session has become active. . . . If the session status column is currently INACTIVE, then the value of last_call_et represents the elapsed time in seconds since the session has become inactive.”

What is P1 P2 and P3 in V session?

Same P1,P2,P3 means they are waiting on same file, same block and same number of blocks. P1—The absolute file number for the data file involved in the wait. P2—The block number within the data file referenced in P1 that is being waited upon. P3—The reason code describing why the wait is occurring.

What is DB file sequential read in Oracle?

The db file sequential read event signifies that the user process is reading data into the SGA buffer cache and is waiting for a physical I/O call to return. It corresponds to a single-block read. Single block I/Os are usually the result of using indexes.

How do I find my session ID?

How to retrieve the value

  1. Hit F12 – This should open the developer console.
  2. In the console window, click the Cache menu and select view cookie information.
  3. This will open a new page with the cookies listed.
  4. Find the item with the name PHPSESSID.
  5. Copy the value next to VALUE – this is your session id.

How do I find my current session ID?

Description ¶ session_id() is used to get or set the session id for the current session. The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs. See also Session handling.

How do I view a blocked session?

Answer: You can query the dba_blockers and dba_waiters views to locate blocking sessions, but you can also get this information from v$lock and v$session. Also see these related notes on finding Oracle blocking sessions: Find blocking sessions with v$session. Find the data block for a blocking session.

How do I find Oracle SID?

The location path of your Oracle Home Registry is as follows:

  1. HKEY_LOCAL_MACHINE >> SOFTWARE >> ORACLE>>
  2. Oracle_SID will show your SID.
  3. Oracle_Home will show the location of your DB Home.
  4. Oracle_BUNDLE_NAME will show the edition of your Oracle Database.
  5. Oracle_SVCUSER will show the windows user for your Oracle Database.

Why is Oracle session inactive?

It just means that someone is logged in but not executing SQL right at that instant. Your very own session is “INACTIVE” everytime you are in the process of typing in a query via sqlplus. It is a normal state to be in.

What is P1 in V session?

The values represent: P1—The absolute file number for the data file involved in the wait. P2—The block number within the data file referenced in P1 that is being waited upon.

What do P1 and P2 stand for in Oracle?

P1—The absolute file number for the data file involved in the wait. P2—The block number within the data file referenced in P1 that is being waited upon. P3—The reason code describing why the wait is occurring.

Is the P1, P2, P3 parameter out of date?

So the p1,p2,p3 parameters give more information for a particular kind of event. for the descriptions. Is this answer out of date? If it is, please let us know via a Comment

What does p1, p2, p3 mean in V$ session?

Want to understand what exactly P1TEXT, P1, P3TEXT, P2 denote in various v$ views like v$session, v$session_wait. Documentation says But don’t quite understand how to interpret them and make use of that during troubleshooting.

What does same p1, p2, p3 mean?

Same P1,P2,P3 means they are waiting on same file, same block and same number of blocks. But could be on different rows or same rows. You need to query v$lock to find out more info. P1—The absolute file number for the data file involved in the wait.