ORA_ROWSCN Timestamp

Similar Questions

• Session ORA_ROWSCN is linked?

  I was doing research to try to understand a bit more about the ORA_ROWSCN feature.  I hope someone can explain what I see.

  For my tests, I created the following table.

  CREATE TABLE TEST3

  (

  COL1 NUMBER,

  USERS VARCHAR2 (10) USER BY DEFAULT.

  USERS_SID NUMBER SYS_CONTEXT ('USERENV', 'SID') BY DEFAULT,

  TIME_STAMP DATE DEFAULT SYSDATE

  );

  I inserted lines in this table - I first connected as SYSTEM, reconnected as SYSTEM and then connected as CODY.  The first session created for the connection of the SYSTEM was SID 255 (as shown in the output).  The next session created for the connection of the SYSTEM was SID 367.  The next session created for the connection of CODY was 255 SID.  It was the same SID previously used by the connection of the SYSTEM.  Here is the table for which the RCS data.  What I found interesting is that when a change has been made for a given SID, all lines that have been previously inserted or updated so that SID got the new SNA - not only the new lines.  You can see in the outputs field time_stamp including the moment the file is actually spent.

  My question is: why each line previously updated by a given session becomes a new SNA for every change of this session?  For example, in the output, you can see that the last record was inserted at 11:52 and the first record inserted for the session (255) was at 11:32.  However for all records with SID 255 CHN has been updated with the last change.

  

  No - ORA_ROWSCN is NOT bound session.

  You marked this as ANSWER, but I want to make it clear that the statements you have posted is NOT correct. If fact, many of you statements are completely false or very misleading.

  What I found interesting is that when a change has been made for a given SID, all lines that have been previously inserted or updated so that SID got the new SNA - not only the new lines.

  No - not all rows get a new SNA. As others have stated that when the dependencies of line is not used ORA_ROWSCN is at the block level.

  Thus, all THE ROWS in a block will be ORA_ROWSCN even. If you change just ONE LINE then all of THE rows in this block will reflect the ORA_ROWSCN for the block. But the ORA_ROWSCN for other blocks/lines won't be altered 'all lines that have been previously inserted or updated' will NOT have the new ORA_ROWSCN - that will be possible only if these wors are in the same block as the last row being changed but will NOT happen if they are in another block.

  You can see in the outputs field time_stamp including the moment the file is actually spent.

  No - this TIME_STAMP column is populated with the help of SYSDATE so the value will be the SYSDATE value that existed at the time where the INSERT statement is executed.

  The ORA_ROWSCN value is determined at the time of the VALID transaction. Can be seconds, hours, or even days between the time of INSERTION and VALIDATION time.

  Also the function SCN_TO_TIMESTAMP is an APPROXIMATE value and may be shifted a few seconds of the actual time that the operation of SNA was made.

  http://docs.Oracle.com/CD/B28359_01/server.111/b28286/functions149.htm

  SCN_TO_TIMESTAMPtakes as an argument a number that corresponds to a system change number (SCN) and returns an approximate timestamp associated with the SNA. The returned value is of TIMESTAMP the data type. This function is useful when you want to know the time stamp associated with a SNA. For example, it can be used in conjunction with the ORA_ROWSCN virtual to associate a time stamp with the most recent change to a line.

  Notes:

  • The usual accuracy of the value of the result is 3 seconds.
  • The association between a SNA and a timestamp when the RCS is generated is known by the database for a limited period of time. This period is the maximum value of the undo retention period auto tuned, if the database is running in Automatic Undo Management mode, and the retention of flashback time all records in the database, but no less than 120 hours. The time for the association become obsolete only when the database is opened. An error is returned if the SCN specified for the argument SCN_TO_TIMESTAMP is too old.

  You can also have multiple statements within the same transaction. So you can insert 2 rows, and then a few seconds/minutes later insert a few more lines. These lines would TIME_STAMP values due to the use of SYSDATE, but would have to value ORA_ROWSCN EVEN when the TRANSACTION is committed.

  My question is: why each line previously updated by a given session becomes a new SNA for every change of this session?

  Is not - as you know by now.

  The only reason why you example seems to show that this is because all your lines are probably stored in the same block or you change at least one line in EACH block. Each previous row does NOT get a new SNA - only the preceding lines in the same block, modified by the new session (by ANY USER) will appear to get a new SNA.

  As I explained above it has NOTHING to do with what makes a session, or not do. It is ONLY related to a change in beiing in a block.

• ORA_ROWSCN continues to increase without any DML

  Hi Experts,
  
  I use ORA_ROWSCN in ETL for the incremental data capture.
  Problem is that the ORA_ROWSCN continue to increase for some table without any DML.
  Table have ROWDEPENDENCIES.
  There is no audit, trigger, or batch running on the tables.
  Database is 11.2.0.3 on Windows 64 bit OS.
  ETLs perform DML heavy overnight. During the day, max (ORA_ROWSCN) continues to rise for a few tables.
  
  I noticed that during the questioning of a few paintings, SCN_TO_TIMESTAMP (max (ORA_ROWSCN)) has shown the current timestamp.
  
  Can cause the "delayed block drain plug" this?
  If this is not the case, is it then any other bug cause or identified?
  Is there enough reliable ORA_ROWSCN?
  
  Thank you
  Santosh kumar

  Welcome to the forum!
  >
  I use ORA_ROWSCN in ETL for the incremental data capture.
  Problem is that the ORA_ROWSCN continue to increase for some table without any DML.
  Table have ROWDEPENDENCIES.
  There is no audit, trigger, or batch running on the tables.
  Database is 11.2.0.3 on Windows 64 bit OS.
  ETLs perform DML heavy overnight. During the day, max (ORA_ROWSCN) continues to rise for a few tables.

  I noticed that during the questioning of a few paintings, SCN_TO_TIMESTAMP (max (ORA_ROWSCN)) has shown the current timestamp.

  Can cause the "delayed block drain plug" this?
  If this is not the case, is it then any other bug cause or identified?
  Is there enough reliable ORA_ROWSCN?
  >
  Congrats on being one of the few to ask a question which is, as Arte Johnson (of Laugh-In fame) would say, "very interesting".

  Unfortunately for us, you have also provided your own answer! ;)

  Drain plug can cause that? Yes - one of the oddities of the drain plug delay block even with a table by using ROWDEPENDENCIES is that Oracle may not always determine the exact SCN and therefore can use slightly more high when finished.

  Reliable? Yes - ORA_ROWSCN is reliable enough. But, as you will see, you must force the Oracle to drain plug blocks before use ORA_ROWSCN to query the changes.

  The best discussion, which includes the code example, is on the site of challenge from PL/SQL to a fault, a year or two it is
  "Impact of the Serializable Transaction not seen by players (9622).
  http://PLSQL-challenge.blogspot.com/2012/01/rowdependencies-impact-not-seen-by.html

  Anyone with enough interest should read the entire article, long and many answers. You will find them VERY informative. I suggest you add this bookmark to your "Oracle Toolbox.

  I included only a short extract conclusions regarding your question here and the code example illustrating the it.
  >
  Smail:

  I wonder if the ROWDEPENDENCIES guarantees 100% accuracy
  ORA_ROWSCN for each line.
  As far as I understand it, it can still generate false positives, but much less, because each row has its own ORA_ROWSCN that is NOT affected if other lines in the block are updated or locked/jerks, but still can be slightly higher than that of true to the line itself when Oracle it cannot determine precisely when cleaning
  >
  And the answer with the code
  >
  _Nikotin:

  but maybe still slightly higher than that of true to the line itself when Oracle it cannot determine precisely when cleaning.

  Yes, here is the example of the impact of the delay block drain plug:

  drop table plch_test;
  drop table plch_test2;

  create table plch_test (number, varchar2 (100) tilte, number of val) rowdependencies;

  Start
  insert into plch_test values (1, 'creation and validation at level 1', 0);
  insert into plch_test values (2, 'to update and commit to step 2', 0);
  commit;
  end;
  /

  update the value val = 1 plch_test where a = 2;

  change the built-in system buffer_cache;

  commit;

  create table plch_test2 (number, varchar2 (100) tilte, number of val) rowdependencies;

  Start
  insert into plch_test2 values (3, 'create and commit to step 3', 0);
  insert into plch_test2 values (4, 'to update and commit 1e5 times in step 4', 0);
  commit;
  end;
  /

  Start
  because me in 1... loop 1E5
  Update plch_test2 the value val = val + 1 where a = 4;
  commit;
  end loop;
  end;
  /

  Select t.*, Yvert plch_test2 ora_rowscn t
  Union of all the
  Select t.*, plch_test ora_rowscn t
  order by SNA;

  After that, you can see that steps 2 and 3 are reversed in the query result:

  SQL > select t.*, Yvert plch_test2 ora_rowscn t
  2 Union all the
  3. Select t.*, plch_test ora_rowscn t
  4 order of SNA;

  A VAL TILTE SNA
  ---------- -------------------------------------------- ---------- ----------
  1. create and validation, to 1 0 1998971227 step
  3. create and validation, to step 3 0 1998971254
  2 update and validation, 2 1 1999009794 step
  4 update and commit times in step 4 100000 1999224125 1e5
  >
  You can see from the above result to the effect that you get

• Are there records of the sys the timestamp of change for each table?

  I noticed that the sys "object" records just the creation and the timestamp of DDL operation.
  But I need the timestamp of change (for example, insert, update, delete, etc.) for my paintings. Otherwise, I fear that I must create the trigger for each table it's hard work.

  You can use scn_to_timestamp (max (ora_rowscn)) for the dml changes

• Problem migrating from Sybase to Oracle timestamp data

  I'm trying to migrate data from a table of sybase with a timestamp to Oracle column. After having run the generated SQL script unload developer, I get a string that looks like this: 0001000000937aa9 < EOFD >
  
  The generated SQL Developer loading script however will not process it and I get the following message:
  
  
  Column Position Len term Encl. Datatype name
  
  STATUS_TIMESTAMP NEXT * CHARACTER
  String endpoint of: '< EOFD > '.
  
  Sheet 1: Rejected - error on table DAROS. DR_STATUS, the STATUS_TIMESTAMP column.
  ORA-01438: value larger than the precision specified for the column
  
  If you SELECT this field in Sybase you get the same string, except that a number is hexadecimal 0x0001000000937aa9.
  
  Is there a way to overcome this obstacle to which has also had a very smooth migration?
  
  Thank you
  Alex

  I understand that a "timestamp" in Sybase cannot be mapped to a DATE or TIMESTAMP in Oracle. The Sybase data type is not, contrary to the name, meant to store a date or a time. It is more closely related to a SNA to in Oracle. If you just want to convert the data, you will probably need to store them in a VARCHAR2 column in Oracle. But if you have some code that works on the column, you will probably need to redesign this code by hitting Oracle. If you have code that uses this to optimistic locking / avoid updates that have been lost, according to the version of Oracle, you probably want to watch using the virtual ORA_ROWSCN rather.

  Justin

• A bug in the timestamp of text messaging

  Hello. I would like to report a little bug in iOS 10 and below, in text messaging. When I send a sms and conversation contains more than one message, if I delete the last conversation and leave the rest of it canceled, the timestamp of the message I deleted is shown as the timestamp of the message in the main menu of the e-mail, while the original message has been deleted. I mean, when you delete a message, the timestamp of the previous message should appear as the timestamp of the message in the main menu, not the one's who no longer exists. For example, when I delete the last message (with 09:04 timestamp), if the timestamp of the message remaining (12:41 am) should logically be included in the main screen, but 09:04 is always displayed in the main menu.

  ---------------------

  Here is the screenshot of the problem:

  The timestamp of the last message is 09:04. -> > >

  

  -----------------

  Below, I've removed the last message (which was the time stamp 09:04), so that the last post time is 12:41 am logically. -> > >

  

  ---------

  But, in the main menu, the previous time is always displayed as the timestamp of the message-> > >

  

  ------------------

  I think that the time stamp in the main menu should show you the last message that you CURRENTLY HAVE in your conversation, not one that has been deleted and no longer exists.

  09:04 belongs to the message that I deleted.

  The timestamp should be turned into 12:41.

  -------------------

  Hellllllloooooooo!

• A shippers sometimes emails get the timestamp of 31/12/1969 18:00. Why?

  A sender of guaranteedrate.com has had three of his e-mails on five or six receive the timestamp of 31/12/1969 18:00 when in fact he sent them in the past two weeks. This place well in the slot more early possible date and found only because they appear as an unread. I don't remember what happens with someone else. It's time to plant; I am Central time. He's in Chicago; I'm in Houston. I always run the latest Thunderbird, now at 38.3.0. My OS is XP sp3.

  I meet also now "threading" of the messages that I have not opted in for and that I don't like.

  Thanks for any help.

  The number of thread

  In the Thunderbird menu bar
  View - sort by - (Date?) - (down?) - not threaded
  (If no Menu bar visible, press onAlt')

  Matter of time.

  In simple terms
  The sender, or a mail server goes by, has a low battery or dead in the CMOS, which prevents the computer from forming properly validates a date/time group.
  Or, if the date/time group is damaged in some way.

  The computer uses the time standard UNIX to calculate the date and time.
  It starts at 0 as of January 1, 1970 00:00 GMT and increases by 1 every second. Computers can calculate a date and time by calculating the number of seconds since the beginning of the time UNIX.

  If a computer shows a group 31 December 1969 time - 18:00, this indicates that the computer is 6 hours west of Greenwich, England, in the early period, or is located in the central area WE delay / Canada

  This isn't a problem with the recipient's computer or with Thunderbird.
  The recipient must contact the sender and let her know the problem of time, so he can check his own machine or notify his local mail server.

  TB - 38, 3 Win10-PC

• Use the timestamp when another cell contains one of two values

  Hi everyone again,

  I am struggling with a formula more in number. I have a formula whose time stamps the current date in a cell when a corresponding cell in the map is filled with '1 '.

  =IF(C3=1,TODAY,"")
  

  Hey Joe,

  IF and WHERE are your friends.

  

  Formula in D3 (fill down)

  = IF (OR (C3 = 1, C3 = "G"), TODAY (),"" ")

  Today is dynamic; It is not a timestamp.

  If you open the document tomorrow, it will be a new today (July 23, 2016, at least in Australia).

  Do you want a real timestamp (scheduled) or a dynamic date?

  Kind regards

  Ian.

• I have a problem with a timestamp changed on my error report, I was wondering if I could get someone to help?

  Mozilla crashed about 15 minutes in an online evaluation timed for my university studies I can't repeat. The attempt to get information on the crash, so that my University could see that I was not lying about the time of the accident and the site I was on, the timestamp changed when I clicked on the link for more detailed information.

  I was wondering if there was anywhere I could get the original timestamp as time seems to have changed on my subject: blocking the page as well.

  Emergency assistance would be most appreciated.

  Hello abital, about: crashes, click the ID of the accident in question to open on the site of the crash - stats.mozilla.com & switch to the 'Metadata' tab you will find a field named CrashTime who then has time when the accident occurred initially in the form of a Unix timestamp. You can convert this value to a format readable by a service such as www.epochconverter.com

• Why some texts have timestamps and others do not?

  I am trying to determine the exact time that I received a message, but it doesn't have a timestamp. Help?

  All the texts have timestamps.  You may need to press some and drag them to the right on the left to see them.

• Not touch event timestamp in milliseconds

  Touch horodateurs event seem to be in microseconds instead of milliseconds.

  The test page prints below touchstart and timestamps touchstart event in the box.

  http://www.apprisant.com/tab/TS.html

  This has been supported in a bug, looks like you filled the 735553 bug.

• How can I view the timestamps of text on an iPhone 5 c

  On my 5 c 9.3.1 running iPhone, outgoing text messages display a timestamp. Incoming messages only. How can I view the time stamp on incoming messages?

  It is displayed at the top of the first post of the series

  

• Palm Treo 850 text timestamp update for sprint

  Hello!

  I have a Palm Treo Pro 850 running WM 6.1 has been used for several years now and love it. It has recently crashed and I had to do a full memory cleaning. Well, it has been returned to factory settings and now I'm reloading software that is no longer available on the Sprint Palm site: http://kb.hpwebos.com/wps/portal/kb/na/treo/t850/sprint/solutions/article/8604_en.html

  In particular, I'm actually load the driver software for the delivery of text messages timestamp.  If someone has this file and that you wouldn't mind Sending me (or otherwise, direct me to it), I would be very happy!

  Thanks in advance!

  Have you tried this page?

  http://KB.hpwebos.com/wps/portal/KB/na/Treo/T850/Sprint/downloads/page_en.html

  WyreNut

• How to create iMessage timestamps

  How can I create a timestamp in iMessage settings so I get info date and time of each text message I get. I have Android and it's automatic. It of not a big deal, but may be useful in trying to remember when you sent or received a message. Here is an example

  

  iMessages already are time stamped, but hidden by default. To see the time stamp, open any conversation, slide your finger on the message from right to left. However, once your finger is raised, the timestamp will disappear.

• Is there a way to see the timestamps of all messages in a conversation?

  I have time stamps for messages under tension, but I seem to only get a timestamp in early conversations. If more than one hour or so passes, then I will get another timestamp. But I would really like to see timestamps for each message. Is there a way to enable this feature or am I the GROUND?

  Thank you

  Matteo

  Put your finger on one of the messages, and then drag to the left. You should see the schedules for all messages.