MAX (ORA_ROWSCN)

Similar Questions

• 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

• How to find the last schema change hour?

  Hello. I would like to get the following info on our list of schema full of db (11 GR 2 Linux x 64) and every scheme of last modification time (so, if changes have been made in any table, etc.). It is may also get info about who was last modifier, but if I understand correctly, it is not possible without verification turned on?

  DML changes is not something Oracle titles unless explicitly, you're doing something like enable auditing.

  There should be that all the tables in the full schema of analysis, but you could do

  select max(ora_rowscn )
    from schema_name.table_name
  

  and choose the largest value. Assuming that you care cuts, that would give you the SCN for the last INSERT or UPDATE on a table in the schema. If the last such change was relatively recent, you can convert it into a timestamp by calling SCN_TO_TIMESTAMP. But this mapping is only kept for a few days. If "long" means more than a week, and then you try to extrapolate a SNA in time which is likely to be very error-prone.

  Justin

• Get the latest date DML for all tables

  Hi gurus,
  
  Version - ORacle 11i
  
  I need to get a list of the tables that was not 'DML used' for a long time (updates/Inserts / (and selects too if available)). I searched for this in the forum and found 3 methods I used
  
  1 insert/update dtm
  ----------------------------------

    SELECT DISTINCT table_name, T.COLUMN_NAME
      FROM all_tab_cols t
     WHERE UPPER (T.COLUMN_NAME) LIKE 'UPD%'
           OR    UPPER (T.COLUMN_NAME) LIKE 'INSERT%'
             AND T.OWNER = 'STG'
             AND T.DATA_TYPE IN ('TIMESTAMP', 'DATE')
  ORDER BY column_name
  
  Issue- Not all the tables have inaert/upd dtm

  2 all_tab_modifications
  -------------------------------------

    SELECT table_Name, timestamp
      FROM all_tab_modifications t
     WHERE T.TABLE_OWNER = 'STG'
  ORDER BY timestamp ASC
  
  Issue - Not all tables are monitored

  3 ORA_ROWSCN
  ------------------------------------------
  

  select MAX(ORA_ROWSCN), SCN_TO_TIMESTAMP(MAX(ORA_ROWSCN)) from stg.XXXXXX
  
  Issue- This throws error MAX(ORA_ROWSCN) is not a valid input . ie for really old tables this throws error.

  How do I get there?
  
  Thank you
  S

  957793 wrote:
  Thank you peter.

  But one thing I noticed, sometimes at the time where I start an analysis table calculates statistics, the table disappears from the all_tab_modifications

  Thank you
  S

  Yes, makes the Act of analyzing a table disappears from the view of xxx_tab_modifications. It is because this view follows changes in the analyzed table have been modified in order to analyze the self employment can tell whether or not it must be analused "today."

  Assuming that you use more or less the default policy analysis that Oracle puts in place, it would be a pretty safe assumption that any which table not in xxx_tab_modifications had to be a substantial (as defined by the auto scan parameters) activity dml recently, or in other words did not have an important activity for a long time. You can make a difference based on the last_analyzed_date column in the xxx_tables view.

  John

• How to check the date of last used database?

  We have a few databases are not used for a long time. How we can check the last date of use?
  
  I tried scn_to_timestamp (max (ora_rowscn)), does not, because scn_to_timestamp SNA must be not more than 5 days.
  I tried DBA_TAB_modifications, but we have not defined monitoring.
  
  Thank you very much
  
  SkyRiver

  How we can check the last date of use?

  If apps/user to connect through earpiece, you can look in the newspaper of the listener.

• Time modified tablespace

  Hello
  
  
  Please help me find the tablespace last modification time in the case of levels level structure and data.
  
  
  Thank you
  Barros. S

  BalajiShenbagarajan wrote:
  Hello

  Please help me find the tablespace last modification time in the case of levels level structure and data.

  Thank you
  Barros. S

  What do you mean by level of structure? Structure of the object in the storage space or the defination of tablespace itself?. If it is the object of the tablespace level you can query dba_objects to all objects LAST_DDL_TIME in this table space.

  Data tier?-did you meant by LMD in objects that reside in the storage space? If so, you can do this by activating the audit/triggers or using query below for all the objects in the storage space.

  select scn_to_timestamp(max(ora_rowscn)) from ;
  

  But I'm not sure why someone would have such a requirement?

  Concerning
  Anurag

• Name of the dictionary database to get last modified time and date of DML statement?

  How can I know the table is finally updated the date and time? There must be a data dictonary table, please let me know the name of this table.

  Another way to find this info for 10 g + dbs is:

  Select max (ora_rowscn), scn_to_timestamp (max (ora_rowscn)) table.

• Date-time info - when the last time any new record is inserted in a table

  Hi all
  
  is it possible to get information from Date and time - when the last time any new record is inserted in a table without triggers...?
  
  Thanks in advance.
  / Shakeel

  Hello

  user11981535 wrote:
  is it possible to get information from Date and time - when the last time any new record is inserted in a table without triggers...?

  Insert only, I don't think it's possible.
  But you can ora_rowscn pseudo-column and scn_to_timestamp the user function to get the time when the table was modified last:

  Scott@my11g SQL>select scn_to_timestamp(max(ora_rowscn)) lstmod from t1;
  
  LSTMOD
  ---------------------------------------------------------------------------
  13-DEC-10 05.05.22.000000000 PM
  
  Scott@my11g SQL>update t1 set val='stuff' where id=1;
  
  1 row updated.
  
  Scott@my11g SQL>commit;
  
  Commit complete.
  
  Scott@my11g SQL>select scn_to_timestamp(max(ora_rowscn)) lstmod from t1;
  
  LSTMOD
  ---------------------------------------------------------------------------
  13-DEC-10 05.07.19.000000000 PM
  

  But I'm not wheither it is reliable to be used on the production database.

• Updated tables during the weekly load?

  All,
  We are running Oracle 10 g. We try to identify the tables that updated operating expenses of our weekly or monthly. I did Internet searches including this forum, but have not yet found anything useful. I tried the trigger option; It works, but increases significantly at run time. For example, a stored procedure that would run between 1-2 minutes to load approximately 6 500 lines, it took 12 minutes to complete. For the moment, our weekly workload runs in about 7 hours. I predict adding triggers for selected tables drastically increases at run time. I also check the most recent row id won't help with updates and deletions. In addition, the following code works fine when running in Oracle 10 g personal edition, but when running in the development environment, it fails.
  

  select scn_to_timestamp(ora_rowscn) from EMPLOYEE;

  ORA-08181: the specified number is not a number of regime change in force
  ORA-06512: at "SYS." SCN_TO_TIMESTAMP', line 1
  
  
  
  Are there other options other than what I've listed above in order to detect when a table is updated of our weekly load process?
  
  
  
  Thanks in advance,
  
  
  Seyed

  All chastise you for instrumentation does not is correct, but the other option you have "explored" failed because you do not quite understand it.

  Ora_rowscn, is a pseudo column that returns either the RCS of the last change to the block or rank, depending on how the table has been set. The SCN_TO-TIMESTAMP function throws this SNA at a table to perform the conversion. No each NPC is here, I think that the rule is the last fortnight of SNA are there, obviously depends on many variables.

  Your selection did this look upward to the entire table. The "early" lines probably have not been affected over the years, SNA of these blocks have long aged out of the system table. In addition, you don't have the RCS for EACH line, just the last of them has changed.

  Here's how you can use it.

  build a table with three columns (table_name, pre_load_SCN, Post_load_SCN)... before run you out of the lot, which fills with the MAX (Ora_rowscn) of each table. Execute the batch, update of this table with the MAX (Ora_rowscn) still once and for all the tables, a table that does not at least had a line changed since the date of your first analysis.

  Problem: Could be any process, not just the batch. So if you know, NOTHING else is running... you might be sure that you have captured the list of modified tables.

• 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

• MacBook Pro (15 inch, end 2013) with MacOS Sierra 10.12: kernel_task maxing out CPU with external display

  I have a maxed out end 2013 the MacBook Pro Core i7 to 2.6 GHz, 16 GB of DDR3 RAM, 1 TB SSD, NVIDIA GeForce GT 750 M 2048 MB, Intel Iris Pro 1536 MB.

  Also, I have a DELL P2415Q Display 24 inches (3840 x 2160) using Thunderbolt, are involved through the headphone jack and use a USB for lightning to recharge my iPhone.

  I upgraded to macOS Sierra the day he is released and had no problems until this morning. I unplugged my external screen and speakers and used my laptop for about 15 minutes, the battery, and then returned to my office and plugged my Thunderbolt, rear speakers display in and my CPU shot at 100% and never came back down. My Mac is essentially useless because kernel_task is eating all my CPU and to prevent another asks to enter the CPU.

  I have since audited equipment - everything was fine, reset the NVRAM and I tried to erase IOPlatformPluginFamily.kext .plist files but I couldn't on my Mac (trying to follow this guide, started in Safe Mode and everything then went to try and find the file and my Mac just does not have it). When my external screen is plugged if I'm doing anything CPU intensive (videophone, opening of Chrome, etc.) then my kernel_task gets mad again, and the only way to move is to unplug my screen. Connect my iPhone to charge the tips also my kernel_task as well. I followed my internal temperatures, and nothing was out of the ordinary, to cold currently at about 140 °.

  At this point, it seems that any time that puts something on the charging system and increase the temperature internal internal components of my Mac kernel_task maxes my CPU, which brings my Mac to its knees.

  Any ideas how to fix? Is this just a major bug in 10.12?

  Hi, Trent L.

  Try this - problems with macOS Sierra? This fix can help you.

  He got rid of all my macOS strangeness of the Sierra.

  Hope this helps,

  -BrainSel

• Time series: finding max and min for each month

  Hello world. I'm working on a datasheet that has collected the data points for all day for the past 15 years.

  A column stores the date and column B contains a numeric value.

  I want to do the following:

  Create a new table (call it table #2) that:

  (1) is now a time series on a monthly basis (column A contains "year month"). This is why the table contains a header and 15 * 12 = 60 rows of data

  (2) B Col contains the Max value of this month.

  (3) C Col contains the value this month min

  Table #2 should be calculated automatically because I need to find these values for several series. Any ideas?

  Here is a way that I came up with

  

  In the table above, your original data is in columns B and C.

  I've added three additional columns (A, D and E):

  D2 = Year (B2) & NUMTOBASE (MONTH (B2), 10, 2)

  It's shorthand dethrone select D2, and type (or copy and paste it here) the formula:

  = Year (B2) & NUMTOBASE (MONTH (B2), 10, 2)

  E2 = IF (D1≠D2, 0, E1 + 1).

  Select copy of D2 to E2,

  Select cells D2 at the end of column E, block

  A2 = D2 & NUMTOBASE (E2, 10, 2)

  Select A2, copy

  Select A2 at the end of the A2 column, paste

  now create a second table summary as shown:

  

  For 'Summary Table 2016:

  the first four lines are the lines of header

  There are 35 total lines

  Enter the year in cell B1

  A5 = −4 LINE)

  B5 = SIERREUR (VLOOKUP ($B$ 1 & NUMTOBASE(B$4,10,2) & NUMTOBASE($A5,10,2), data: $A:$ C, 3, 0), "")

  Select cell B5, copy

  Select cells B5 at the end of row 5, dough

  Select A5 thru M5, copy

  Select cell A5 at the end of the M column, paste

  B2 = MIN (B)

  B3 = MAX (B)

  Select the cells B2 to B2, copy

  Select the cells B2 through M3, dough

  now duplicate the table and change the year to 2015 for the next year.

  You can duplicate this table as necessary to summarize a year

• power max

  Hello

  No one knows what is the max power by:

  1. a core of mac pro 8 (early 2008) when working at full capacity? That is to say all 4 disks + gf 8000 gt graphics card

  2. Ditto for iMac 21.5 inch clocked at 1.6 Ghz dual core i5, intel graphics hd 6000

  3 and 2.8 Ghz quad core intel i5, iris intel graphics pro 6200

  I need to buy a UPS and need to have this info. Surprisingly enough support tech didn't have this info.

  Thank you

  A standard from the factory Mac Pro (or other model) would have a use power max figure that could be given, but as soon as the user make a change for example, adding a hard drive additional or larger, this figure will change.

  It doesn't help much, but here's the official specs for your model of Mac Pro

  Electrical and environmental requirements

  • ENERGY STAR configurations suffisantes6
  • Voltage: 100-120 v AC or 200-240 VAC (input voltage range)
  • Frequency: 50 Hz to 60 Hz single-phase
  • Current: Maximum of 12A (range low voltage) or 6a (range high voltage)

  For what its worth that classic Mac Pro models have a 980 watt power meaning that is the absolute maximum, he can deliver if fully loaded.

  If you want specific numbers depending on your configuration and use then the best option is to get a socket which allows to measure actual usage. Some examples of such devices.

  https://www.Amazon.com/P3-international-P4460-electricity-monitor/DP/B000RGF29Q/

  http://www.Belkin.com/us/F7C029-Belkin/p/P-F7C029/

• Export of difference JPG high or Max JPG?

  I noticed, as others before me, that quality JPG exported files are much smaller than the MAX quality JPG files exported. Can someone explain the differences? I did some tests and to the naked eye (mine) images do not look so different on the screen (retina). But MAX exports are often almost twice as HIGH exports.

  What is happening with this?

  Obviously, the difference will be apparent at higher magnifications.

  All that is good enough for your export venture, but maintain the original file at its original resolution. You never know what you might need in the future quality.

• How to find a mini/MAXI according to specific criteria

  I need to find the low/over highest number in a given list, but according to a variable. For example:

  

  How removed many/most cars sold to someone in the role of sales? Just the number here.

  * Bonus: in a separate cell, generate the name of the sales person that has the most sold cars.

  MacBook Pro 15 retina

  El Capitan

  3.6.2 numbers

  Thanks for the help.

  Maybe it will work for you:

  

  Make sure that the first line is a header

  Add additional columns as illustrated titled "sales", "Finance" and "Manager".

  D2 = IF ($B2 = D$ 1, $C2, "")

  It's shorthand dethrone select cell D2 and type (or copy and paste it here) the formula:

  = IF($B2=D$1,$C2, "")

  Select cell D2, copy

  Select cells D2 the F6, paste

  now created the table of Stats as shown, with the first row, a header row

  B2 = if (counta (a2) > 0, MAX (OFFSET (table 3: $D$ 1, 0, MATCH ($A2, table $1 3::D: F$ 1.0) −1, LINES (table 3::D), 1)), "")

  C2 = if (counta (a2), OFFSET (table 3: $A$ 1, MATCH (B2, OFFSET (table 3: $D$ 1, 0, MATCH ($A2, table $1 3::D: F$ 1.0) −1, LINES (table 3::D), 1), 0) −1, 0), "")

  Select the cells B2 C2, copy

  Select the cells B2 at the end of the C column, paste