Why vector increase RAM plus table double?

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• With the help of the table DOUBLE in the subquery to UPDATE

  The following code should work? I feel like I've done it before, but I get an error 'must be a subquery' now.
  
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  Published by: user8031991 on April 26, 2013 11:57

  Hello

  user8031991 wrote:
  Thank you, Vanessa and all others.

  I guess I should've explained WHY I wanted to use this alternate syntax.

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  I really feel like it was working before. I get just senile? Is it possible to simulate a suquery like that?

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  Published by: Frank Kulash, April 26, 2013 16:30

• silly question on table double

  Hello gurus
  
  This double table is a fictitious table with varchar2 (1)... my question is how it can select the many psedocolumns of the double does not exceed the space allowed to varchar2 (1)
  
  Published by: 964145 on October 9, 2012 17:35

  Hello

  964145 wrote:
  Why does say varchar2 (1) and we are able to select more than one character of the double... often you explain this buddy?

  VARCHAR2 (1) means the same thing in the definition of double that he would return in the table definition.
  Each column has a data type. The data type of the column called dummy in the double table lies be VARCHAR2.
  VARCHAR2 columns always have a specified maximum length. The length of dual.dummy gets to 1.

  Once more, pseudo-colonnes are independent of actual columns. You can SELECT any pseudo-column in any table, no matter what the actual columns in this table. For example, the ROWNUM Pseudo-column contains a NUMBER, but you can SELECT ROWNUM of tables (e.g. double) who do not have any number of columns.

• Why the blocks of temporary tables are placed in the buffer cache?

  I read the following statement, which seems quite plausible to me: "Oracle7.3 and generates from close db file sequential reading of the events when a dedicated server process reads data from temporary segment of the disc." Older versions of Oracle would read temporary segment data in the database buffer cache using db file scattered reads. Releases latest exploit heuristics that data of temporary segment is not likely to be shareable or revisited, then reads it directly to a server process programs global (PGA). »
  
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  So, I have the following questions:
  (1) is my experimental set-up and correct my conclusions (i.e. are blocks of temporary tables really placed in the buffer cache)?
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  (3) what V$ BH. OBJD consult for blocks belonging to temporary tables?
  
  Thanks for any help and information
  Kind regards
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  Experience I ran (on 10.2 /Linux)
  =============================

  SQL*Plus: Release 10.2.0.1.0 - Production on Sun Oct 24 22:25:07 2010
  
  Copyright (c) 1982, 2005, Oracle.  All rights reserved.
  
  
  Connected to:
  Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
  With the Partitioning, OLAP and Data Mining options
  
  SQL> create global temporary table temp_tab_4 on commit preserve rows as select * from dba_objects;
  
  Table created.
  
  SQL> alter system flush buffer_cache;
  
  System altered.
  
  SQL> select count(*), status from v$bh group by status order by 1 desc;
  
    COUNT(*) STATUS
  ---------- -------
        4208 free
        3 xcur
  
  SQL> select count(*) from temp_tab_4;
  
    COUNT(*)
  ----------
       11417
  
  SQL> -- NOW THE BUFFER CACHE CONTAINS USED BLOCKS, THERE WAS NO OTHER ACTIVITY ON THE DATABASE
  select count(*), status from v$bh group by status order by 1 desc;
  SQL> 
    COUNT(*) STATUS
  ---------- -------
        4060 free
         151 xcur
  
  SQL> -- THE BLOCKS WITH THE "STRANGE" OBJD HAVE BLOCK# THAT CORRESPOND TO THE TEMPORARY SEGMENT DISPLAYED
  -- IN V$TEMPSEG_USAGE
  select count(*), status, objd from v$bh where status != 'free' group by status, objd order by 1 desc;
  SQL> SQL> 
    COUNT(*) STATUS      OBJD
  ---------- ------- ----------
         145 xcur       4220937
        2 xcur        257
        2 xcur        237
        1 xcur        239
        1 xcur    4294967295
  
  SQL> -- THE OBJECT REFERENCED BY THE NEWLY USED BLOCKS IS NOT LISTED IN DBA_OBJECTS
  select * from dba_objects where object_id = 4220937 or data_object_id = 4220937;
  
  SQL> 
  no rows selected
  
  SQL> SQL> -- THE BLOCKS WITH THE "STRANGE" OBJD ARE MARKED AS TEMP IN V$BH
  select distinct temp from v$bh where objd = 4220937;
  SQL> 
  T
  -
  Y
  
  SQL> 

  Edited by: user4530562 the 25.10.2010 01:12
  
  Edited by: user4530562 the 25.10.2010 04:57

  The reason to put the blocks to the global temporary table in the buffer cache is the same thing why you put ordinary table blocks in the cache buffers-> you want some of them to be in memory.

  If you ask why don't keep us somehow temporary tables in the PGA - well what happens if this temporary table will be 50 GB? 32-bit platforms cannot even handle this and you do not want a process of becoming uncontrollable so great.

  Moreover, TWG will allow you to restore, back to a backup (or savepoint implied when an error occurs during a call DML), and this requires protection by the cancellation. Place lines / revenge in PGA would have complicated the implementation even further... now GTT is almost of the regular tables which just happened to reside in temporary files.

  If you really want to put data in the PGA only, then you can create collections of PL/SQL and even access through the use of SQL (coll CAST AS xyz_type) where xyz_type is a TABLE of an object any.

  --
  Tanel Poder
  New online seminars!
  http://tech.e2sn.com/Oracle-training-seminars

• Possible NB520-108 - increase RAM to 2 GB?

  Hello

  I don't want to increase the RAM which comes with the NB520-108. I know that one is 1 GB memory DDR3 at 1,066 MHZ. I can't find this speed, and my question is: can I put a 2 GB of DDR3 memory module 1.333 MHZ?

  Thanks to everyone in advance.

  Kind regards
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  Hey Buddy,

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  Hello

  increases the speed of the ram decreases the life of the battery of your laptop because mine has been upgraded to 1 GB

  Hello

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  Good bye

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  arotex wrote:

  Hello!

  I have Lenovo z50-70 with amd Kaveri 7300 A10 and GPU R6 (all together known as RADEON Jet R6 M255DX). It has 1 GB of ddr3 ram allocated. Since I increased my ram I want to increase the ram on the gpu. How can I do?

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