The most basic RMAN implementation

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  Happy new year everyone.

  I have a table of price in my system that has several awards for each product with the date, the price is entered into force.

  I have queries throughout the system to retrieve the most recent actual price for the date of the transaction.

  I can find to implement the easiest way is to have a user-defined function to collect the prize.

  My problem is that many of my questions have access to large amounts of data (for example, transactions) and my table of prices is also big enough - both have millions of records. Using a Pl/SQL function defined by the user in my query, I get a lot of switching context between SQL and PL/SQL and my questions are not well

  Here is an example of code, which simplifies my scenario:

  drop table xo_stock_trans;
  create table xo_stock_trans (item varchar2(25), trans_date date, quantity number(20,4));
  insert into xo_stock_trans values('A',TO_DATE('25-DEC-2014','DD-MON-YYYY'), 4);
  insert into xo_stock_trans values('A',TO_DATE('27-DEC-2014','DD-MON-YYYY'), -2);
  insert into xo_stock_trans values('A',TO_DATE('28-DEC-2014','DD-MON-YYYY'), 5);
  insert into xo_stock_trans values('B',TO_DATE('23-DEC-2014','DD-MON-YYYY'), 20);
  insert into xo_stock_trans values('B',TO_DATE('26-DEC-2014','DD-MON-YYYY'), -6);
  insert into xo_stock_trans values('B',TO_DATE('29-DEC-2014','DD-MON-YYYY'), 15);
  /
  -- Generate lots more data
  BEGIN
      -- Generate more trans dates
      for r in 1..1000
      LOOP
          insert into xo_stock_trans
          select item, trans_date - r - 7 as  trans_date, ROUND(dbms_random.value(1,50),2) as quantity
          from xo_stock_trans
          where trans_date between TO_DATE('23-DEC-2014','DD-MON-YYYY') AND TO_DATE('29-DEC-2014','DD-MON-YYYY')
            and item in ('A','B');
      END LOOP;
      COMMIT;
      -- generate more items
      for lt in 1..12 
      LOOP
          -- generate C,D, E, items
          INSERT into xo_stock_trans
          SELECT chr(ascii(item)+(lt*2)) as item, trans_date, quantity
          from xo_stock_trans
          where item in ('A','B');
          -- generate A1, A2, B1, B2, etc
          for nm in 1..10
          LOOP
              INSERT INTO xo_stock_trans
              select item || to_char(nm), trans_date, quantity
              from xo_stock_trans
              where length(item) = 1;
          END LOOP;
          COMMIT;
      END LOOP;
      COMMIT;
  END;
  /
  create index xo_stock_trans_ix1 on xo_stock_trans (item);
  create index xo_stock_trans_ix2 on xo_stock_trans (trans_date);
  exec dbms_stats.gather_table_stats(ownname =>user, tabname => 'XO_STOCK_TRANS' , estimate_percent => 100, degree => dbms_stats.auto_degree, cascade=>true);
  /
  
  
  drop table xo_prices;
  create table xo_prices (item varchar2(25), price_date date, gross_price number(20,4), net_price number(20,4), special_price number(20,4) );
  insert into xo_prices values ('A', to_date('01-DEC-2014','DD-MON-YYYY'), 10, 8, 6);
  insert into xo_prices values ('A', to_date('25-DEC-2014','DD-MON-YYYY'), 9, 8, 6);
  insert into xo_prices values ('A', to_date('26-DEC-2014','DD-MON-YYYY'), 7, 6, 4);
  insert into xo_prices values ('B', to_date('01-DEC-2014','DD-MON-YYYY'), 5.50, 4.50, 3);
  insert into xo_prices values ('B', to_date('25-DEC-2014','DD-MON-YYYY'), 5.00, 4.00, 3);
  insert into xo_prices values ('B', to_date('26-DEC-2014','DD-MON-YYYY'), 3.50, 2.50, 2);
  /
  -- Generate lots more data
  BEGIN
      -- Generate more price dates
      for r in 1..1000
      LOOP
          insert into xo_prices
          select item, price_date - r - 7 as  price_date,gross_price, net_price, special_price
          from xo_prices
          where price_date between TO_DATE('23-DEC-2014','DD-MON-YYYY') AND TO_DATE('29-DEC-2014','DD-MON-YYYY')
            and item in ('A','B');
      END LOOP;
      COMMIT;
      -- generate more items
      for lt in 1..12 
      LOOP
          -- generate C,D, E, items
          INSERT into xo_prices
          SELECT chr(ascii(item)+(lt*2)) as item, price_date, gross_price + (lt*2), net_price + (lt*2), special_price + (lt*2)
          from xo_prices
          where item in ('A','B');
          -- generate A1, A2, B1, B2, etc
          for nm in 1..10
          LOOP
              INSERT INTO xo_prices
              select item || to_char(nm), price_date, gross_price, net_price, special_price
              from xo_prices
              where length(item) = 1;
          END LOOP;
          COMMIT;
      END LOOP;
  END;
  /
  
  create index xo_prices_ix1 on xo_prices (item, price_date);
  exec dbms_stats.gather_table_stats(ownname =>user, tabname => 'XO_PRICES' , estimate_percent => 100, degree => dbms_stats.auto_degree, cascade=>true);
  /
  
  create or replace function xo_get_price(I_Item in VARCHAR2, I_Date in DATE, i_Price_type IN VARCHAR2) RETURN NUMBER
  IS
      -- Function to get most recent effective price prior to the date
      CURSOR c_get_prices(P_Item VARCHAR2, P_Date VARCHAR2)
      IS
      SELECT gross_price, net_price, special_price
      FROM XO_PRICES
      WHERE item = P_Item
       AND price_date <= P_Date
      ORDER BY price_date desc; -- most recent price
      
      l_gross_price NUMBER(20,4);
      l_net_price NUMBER(20,4);
      l_special_price NUMBER(20,4);
  BEGIN
      OPEN c_get_prices(I_Item, I_Date);
      FETCH c_get_prices INTO l_gross_price, l_net_price, l_special_price;
      CLOSe c_get_prices;
      
      IF I_Price_Type='GROSS' then return l_gross_price;
      ELSIF I_Price_Type= 'NET' then return l_net_price;
      ELSIF I_Price_Type= 'SPECIAL' then return l_special_price;
      END IF;
  END xo_get_price;
  /
  
  -- Here is a typical query I am trying to perform
  select tr.item, tr.trans_date, tr.quantity
      , xo_get_price(tr.item, tr.trans_date, 'GROSS') as gross_price
      , xo_get_price(tr.item, tr.trans_date, 'NET') as net_price
      , xo_get_price(tr.item, tr.trans_date, 'SPECIAL') as special_price
  from xo_stock_trans tr
  where tr.trans_date between '01-AUG-2014' and '31-AUG-2014';
  

  I would like to refactor my request so that I do not use the user Pl/SQL functions, but so far I can't get something that works better than the SQL above. For example, the following query is MUCH longer:

  select tr.item, tr.trans_date, tr.quantity
      , pr.gross_price
      , pr.net_price
      , pr.special_price
  from xo_stock_trans tr
  join xo_prices pr on pr.item = tr.item
                  and pr.price_date = (select max(pr2.price_date)
                                       from xo_prices pr2
                                       where pr2.item = pr.item
                                         and pr2.price_date <= tr.trans_date
                                       )
  where tr.trans_date between '01-AUG-2014' and '31-AUG-2014';
  

  I'm interested to know if anyone has addressed a similar scenario and have managed to write more efficient code.

  I looked at the determinism/manual caching of the function, but the article/date combinations are quite unique and therefore he does not benefit from him.

  Any suggestion under review - parallelism, analytical, pipeline functions, etc.

  Alan

  Hi, Alan.

  Alan Lawlor wrote:

  ...

  My problem is that many of my questions have access to large amounts of data (for example, transactions) and my table of prices is also big enough - both have millions of records. Using a Pl/SQL function defined by the user in my query, I get a lot of switching context between SQL and PL/SQL and my questions are not well...

  You got that right!  User-defined functions can be very practical, but this practice comes with a price.

  What version of Oracle are you using?  The Oracle 12, there is a new feature of 'temporal validity' which may help you.

  In any version, it will be much faster if you add a new column to the xo_prices table.  You can call this end_date, although it would in fact be the date when some other prices took effect.  You might put DATE' 9999-12-31 in the column end_date for current prices.  You can calculate end_date using the analytical function of LEAD.  Be sure to re-calcluate end_date when you insert new rows into xo_prices, or when you update the dates on existing lines.

  Once you have PRICE_DATE and end_date in the XO_PRICES table, you can join this table to get the real price from d by including

  AND d > = xo_prices.price_date

  AND d< >

  in the join condition.

  In some situations, especially when you don't have much different (item, dates) combinations, scalar-sub-queries could be faster than joins.

  Whatever it is, it participates without PL/SQL, so there is no context switching.

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  Copyright (c) 1982, 2005, Oracle. All rights reserved.
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  Copyright (c) 1982, 2005, Oracle.  All rights reserved.
  
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  ............................................... ORCL DATABASE...
  
  Microsoft Windows XP [Version 5.1.2600]
  Copyright (C) 1985-2001 Microsoft Corp.
  
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  Copyright (c) 1982, 2005, Oracle. All rights reserved.
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  Published by: Muhammad.Usman on July 28, 2009 23:01

  You can also take your backups without a recovery catalog database. The additional advantage of using a database to catalog vs using the controlfile as repository (default average) target is essentially
  >
  RMAN automatically manages backup metadata in the database control file is saved. To protect and maintain metadata backup for long periods of time, the RMAN Repository is created in a separate database. This repository is generally referred to as a catalog of recovery. The benefits of using a catalog of recovery include:

  *

  Stores long-term backup information
  *

  Store the metadata for multiple databases
  *

  Restore a backup available on another system

  Another reason to use a recovery catalog is the limited size of the target database control file. If the control file is too small to contain additional metadata from backup, then the existing backup information are crushed, making it difficult to restore and recover using these backups.
  >

  of http://download.oracle.com/docs/cd/B19306_01/server.102/b25159/configbp.htm#CHDBCHAC

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• Need help get data with the most recent date of entry into

  Hey guys;
  
  I need help with fine tuning a query to get the one with the most recent implementation.
  
  Here's my current query:
  
  /**********************************************
  Select sge.seal_group_id,
  SGE.equipment_id,
  SGE.effective_date
  of seal_group_equipment EMS.
  seal_group sg
  where equipment_id = 48801
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  ******************************************************/
  
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  MAX will not work because the SEAL_GROUP_ID could depart. I would say analytical:

  select seal_group_id,
  equipment_id,
  effective_date
  from (
  select sge.seal_group_id,
  sge.equipment_id,
  sge.effective_date,
  RANK() over (partition by equipment_id order by effective_date desc) r
  from seal_group_equipment sge,
  seal_group sg
  where equipment_id = 48801
  AND SGE.SEAL_GROUP_ID = SG.SEAL_GROUP_ID
  and sge.end_date is null)
  where r = 1;
  

  Keep in mind if two records have the same effective_date, they would both appear.

  Note: query above has not been tested, since there is no script provided.

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  Settings / general / accessibility / VoiceOver / OFF, or

  Settings / Siri / OFF

  As for your use of the battery, you can check what app pulls most of its use in the settings / battery.  A new version of the app is sometimes problematic, not necessarily iOS or iPhone.  If you see a unusual % of use of a particular application, or force-to leave it removal/reinstalling it or remove it until an update comes.  If anything seems unusual, it might be a problematic installation of iOS, in which case, you could backup your iPhone and restore it:

  Restore your iPhone, iPad or iPod touch from a backup - Apple Support

• I did the most recent iOS 10 updated, just heard on the news that Yahoo has been hacked.  I changed my Yahoo email but can't find the field to change on my devices.  It is simply not there, what is happening?

  I did the most recent iOS 10 updated, just heard on the news that Yahoo has been hacked.  I changed my password to Yahoo mail but can't find the field to change the password on my devices.  It is simply not there, what is happening?

  For some reason any change automatically if change you it online. Today, I changed my password through my office and I went to change the mail and she had already changed.

  You can try to delete your account your unit off and add it again.

• Try to add a page to a pages document. It worked until now but just finished page 13 with text and photos and cannot add another page, using macbook pro with El Capitan and the most recent version of the Pages.

  Try to add a page to a pages document. It worked until now but just finished page 13 with text and photos and cannot add another page, using macbook pro with El Capitan and the most recent version of the Pages.

  You have placed your beam to insert at the end of your text on page 13 and then apply Insert menu: Page Break? In the v5.6.2, Pages I just add a new page to a section of four pages to this approach.

• Why Apple Watch cannot show the heart rate all implement open outdoor execution on?

  Why Apple Watch cannot show the heart rate all implement open outdoor execution on?

  Technical data has shown that he can do, but in fact can not?

  It is not good advertising. During the race I'm not for the convenience of drag any function. It is wet.

  This link should help you your heart rate. What it means, and where on Apple Watch you will find. -Apple Support

• Verifying plugins to make sure that I have the most up to date, I'm not having any luck all do is just turning a black circle?

  Verifying plugins to make sure that I have the most up to date, I'm not having any luck all do is just turning a black circle?

  Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem.

  • Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance
  • Do NOT click on the reset button on the startup window Mode safe
  • https://support.Mozilla.org/KB/safe+mode
  • https://support.Mozilla.org/KB/troubleshooting+extensions+and+themes