Activate the Express Cache on Pad think e530

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  http://forums.NI.com/NI/board/message?board.ID=330&requireLogin=false&thread.ID=10609

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• Activate the browser cache

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• To activate the win7x32 I've downloaded

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  I original posted this in the technet forum but I think it should have been posted here because I don't have an answer.  I'm not a computer programmer, and I think that it is a forum appropriate for me.

   

  I have a Dell Latitude c840 with XP and have maxed out with SSD, wifi-N, 2 GB, etc. It works quite well and I went to Dell and downloaded their win7x32 "reinstall the OS. This software is for owners of Dell with subsequent model systems in need of a replacement for DVD. Of course, this does not apply to me as the C840 is pre-vista, but I have burned DVD and install Dell win7x32.  Is installed on the partition (I did not upgrade) just fine and he found Center Update dell, chipset device drivers, etc., for the C840 without having to download from the Ms.

  It's been 2 days and all drivers are working fine and the laptop seems to work perfectly.  I want to activate it.  Can I buy an edition Home premium win7x32... and simply enter the key?  I can do an "upgrade to ultimate' or 'pro '?  How can I go on the activation of it that I installed myself?

  Thanks for the research!

  Microsoft provides more Windows 7 Home Premium digital download, you will need to purchase a license upgrade box retail and enter the product key.

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  Version upgrade-

  Microsoft Windows 7 Home Premium Upgrade

  When you receive the package.

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• Copies of unexpected CR in the buffer cache

  Hello
  
  While trying to understand the mechanisms of the Oracle buffer cache, I ran a little experiment and observed an unexpected result. I believe that my expectation was wrong, and I would be so grateful, if someone could explain to me what I misunderstood.
  From what I understand, a copy of coherent reading (CR) of a buffer in the cache is created, when the old content of a buffer to be read, for example to ignore changes made by a transaction not yet committed when you query a table. I also thought, that copies of CR in the buffer cache can be reused by subsequent queries requiring a roll back image of the corresponding block.
  
  Now, I ran the following experiment on a DB of 10.2 or slowed down.
  1. I create a BC_TEST table (in a non-SAMS tablespace)
  -> V$ BH shows an A buffer with XCUR status for this table - V$ BH. COURSE number is 4, which indicates a segment according to various sources on the internet header.
  2 session 1 inserts a row into the table (and not valid)
  -> Now V$ BH shows 8 pads with XCUR status attached to the BC_TEST table. I think it's the blocks of a certain extent be allocated to the table (I expected as a block of data to load into the cache in addition to the header that was already there in step 1). There are still buffers with CLASS A # = 4 of step 1, a buffer B with XCUR and CLASS status # = 1, which indicates a block of data, according to various sources on the internet, and other 6 blocks with FREE status and CLASS # = 14 (this value is decoded differently in different sources on the internet).
  3 session 2 emits a ' select * from bc_test ".
  -> V$ BH shows 2 extra buffers with CR and the same FILE status #/ BLOCK # as buffer B in step 2. I understand that it compatible read copy needs to be done to undo the uncommitted changes in step 2 - However, I do not understand why * 2 * these copies are created.
  Note: with a slight variation of the experience, if I don't "select * from bc_test" in Session 2 between step 1 and 2, and then then I only get CR 1 copy in step 3 (I expect).
  4 session 2 issues "select * from bc_test"new"
  -> V$ BH presents yet another extra stamp with CR and the same FILE status #/ BLOCK # as buffer B step 2 (i.e. 3 these buffers in total). Here I don't understand, why the request cannot reuse the CR copy already created in step 3 (which already shows B buffer without changes to the transaction not posted in step 2).
  5 session 2 questions repeatedly ' select * from bc_test "new"
  --> The number of buffers with CR and the same FILE status #/ BLOCK # as buffer B step 2 increases by one with each additional request up to a total of 5. After that, the number of these buffers remains constant after additional queries. However various session statistics 2 ("consistent gets", "Blocks created CR", "the consistent changes", "data blocks consistent reads - undo records applied," "no work - gets consistent reading") suggests, that session 2 continues to generate copies of current reading with each "select * of bc_test" (are the buffers in the buffer cache may simply be reused from there on?).
  
  
  
  To summarize, I have the following question:
  (I) why the insertion of a single line (in step 2) load 8 blocks in the buffer cache - and what does the CLASS # = 14 indicate?
  (II) why the first select statement on the table (step 3) creates 2 copies of CR (use single) data block of the table (instead of one as I expect)?
  (III)) why other issues create copies of CR of this block of data that is unique (instead of reusing the copy created by the first select statement CR)?
  (IV) which limits the number of CR created copies to 5 (is there some parameter checking this value, it is according to some sizing of the cache or is it simply hard-coded)?
  (V) what exactly triggers the creation of a copy of CR of a buffer in the buffer cache?
  
  Thank you very much for any answer
  Kind regards
  Martin
  
  P.S. Please find below the Protocol of my experience
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > drop table bc_test;
  
  Deleted table.
  
  SQL > create table bc_test (collar number (9)) tablespace local01;
  
  Table created.
  
  SQL > SELECT bh.file #, bh.block #, bh.class #, bh.status, bh.dirty, bh.temp, bh.ping, bh.stale, bh.direct, bh.new
  2 from V$ BH bh
  3, o dba_objects
  4. WHERE bh. OBJD = o.data_object_id
  5 and o.object_name = 'BC_TEST. '
  6 order of bh.block #;
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur O N N N N N
  
  
  --------------------------------------------------
  Session 1
  --------------------------------------------------
  SQL > insert into bc_test values (1);
  
  1 line of creation.
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur O N N N N N
  5 210 1 xcur O N N N N N
  5 211 14 free N N N N N N
  5 212 14 free N N N N N N
  5 213 14 free N N N N N N
  5 214 14 free N N N N N N
  5 215 14 free N N N N N N
  5 216 14 free N N N N N N
  
  8 selected lines.
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  
  SQL > select * from bc_test;
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  28 recursive calls
  0 db block Gets
  Gets 13 coherent
  0 physical reads
  size of roll forward 172
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 xcur N N N N N N
  5 211 14 free N N N N N N
  5 212 14 free N N N N N N
  5 213 14 free N N N N N N
  5 214 14 free N N N N N N
  
  8 selected lines.
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  SQL > /.
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  0 recursive calls
  0 db block Gets
  Gets 5 in accordance
  0 physical reads
  size of roll forward 108
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  SQL >
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 xcur O N N N N N
  5 211 14 free N N N N N N
  5 213 14 free N N N N N N
  5 214 14 free N N N N N N
  
  8 selected lines.
  
  SQL >
  
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  SQL > select * from bc_test;
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  0 recursive calls
  0 db block Gets
  Gets 5 in accordance
  0 physical reads
  size of roll forward 108
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  SQL >
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 xcur O N N N N N
  5 211 14 free N N N N N N
  5 213 14 free N N N N N N
  
  8 selected lines.
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  SQL > select * from bc_test;
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  0 recursive calls
  0 db block Gets
  Gets 5 in accordance
  0 physical reads
  size of roll forward 108
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 xcur O N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 211 14 free N N N N N N
  5 213 14 free N N N N N N
  
  9 selected lines.
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  SQL > select * from bc_test;
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  0 recursive calls
  0 db block Gets
  Gets 5 in accordance
  0 physical reads
  size of roll forward 108
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  SQL >
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 xcur O N N N N N
  
  7 selected lines.
  
  --------------------------------------------------
  Session 2
  --------------------------------------------------
  SQL > /.
  
  no selected line
  
  
  Statistics
  ----------------------------------------------------------
  0 recursive calls
  0 db block Gets
  Gets 5 in accordance
  0 physical reads
  size of roll forward 108
  272 bytes sent via SQL * Net to client
  374 bytes received via SQL * Net from client
  1 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  0 rows processed
  
  SQL >
  
  --------------------------------------------------
  Control session
  --------------------------------------------------
  SQL > /.
  
  FOLDER # BLOCK # CLASS # STATUS D T P S D N
  5 209 4 xcur N N N N N N
  5 210 1 xcur O N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  5 210 1 cr N N N N N N
  
  7 selected lines.

  What version of 10.2, on what platform, and enabled to RAC? What exactly was the tablespace definition?

  (I) why the insertion of a single line (in step 2) load 8 blocks in the buffer cache - and what does the CLASS # = 14 indicate?

  It sounds like you may have formatted all of the first measure - assuming that you use 8 KB blocks and allocated system extended. But it didn't happen when I checked 10.2.0.3 on a version of the single instance of the Oracle.

  Class 14 is interpreted as "unused" in all versions of Oracle that I saw. This would be consistent with the formatting, but it bringing is not below the high water mark. You could ' alter system dump datafile N block min X block max Y' for the segment header block, the block used and unused block in the discharge.

  (II) why the first select statement on the table (step 3) creates 2 copies of CR (use single) data block of the table (instead of one as I expect)?

  Maybe because the first copy clean uncommitted transactions and clones of the second copy of the result to return to a given SNA - but that's just a guess, I had not noticed this behavior before, so I have to do some experiments to find out why it's happening.

  (III)) why other issues create copies of CR of this block of data that is unique (instead of reusing the copy created by the first select statement CR)?

  The first block of CR you create includes a moment earlier that the beginning of the second query, so your session must start from the current. If you have set the isolation level to fix SNA session (for example, "set transaction read only") before the first application, in my view, you would see that the copies of CR will not increase after the initial creation.

  (IV) which limits the number of CR created copies to 5 (is there some parameter checking this value, what is according to some sizing of the cache or is simply badly coded)?

  Hidden parameter Dbblock_max_cr_dba which, by default, is 6. The code still does not seem to obey this limit, but generally you will see only 6 copies of a block in the buffer.

  (V) what exactly triggers the creation of a copy of CR of a buffer in the buffer cache?

  There are at least two options - (a) a session needs to see a copy of a block with recent changes removed, either because they are uncommitted transactions, the session needs to see the block he was when he started to run a particular query or transaction, (b) a session changed a block when he gets hold of the current version - and in certain circumstances (possibly when the update is through a analysis), it will make a copy of the block, mark the previous CR copy, mark the new copy as xcur, and change the copy.

  Incidentally, xcur is a RAC status - it is possible to have blocks in the buffer which are xcur, but not "obtained in current mode.

  Concerning
  Jonathan Lewis

• Question Basic setting, ask questions about the buffer cache

  Database: Oracle 10g
  Host: Sun Solaris, 16 CPU server
  
  
  
  I look at the behavior of some simple queries that I start the tuning of our data warehouse.
  
  Using SQL * more and AUTOTRACE, I ran this query two times in a row
  
  SELECT *.
  OF PROCEDURE_FACT
  WHERE PROC_FACT_ID BETWEEN 100000 AND 200000
  
  He finds the index on PROC_FACT_ID and conducted an analysis of the range of indexes to access the data in the table by rowid. The first time, that it ran, there are about 600 physical block reads as data in the table were not in the buffer cache. The second time, he had 0 physical block reads, because they were all in the cache. All this was expected behavior.
  
  So I ran this query twice now,
  
  SELECT DATA_SOURCE_CD, COUNT (*)
  OF PROCEDURE_FACT
  DATA_SOURCE_CD GROUP
  
  As expected, he made a full table scan, because there is no index on DATA_SOURCE_CD and then chopped the results to find the different DATA_SOURCE_CD values. The first run had these results
  
  compatible gets 190496
  physical reads 169696
  
  The second run had these results
  
  compatible gets 190496
  physical reads 170248
  
  
  NOT what I expected. I would have thought that the second run would find many of the blocks already in the cache of the pads of the first execution, so that the number of physical reads would drop significantly.
  
  Any help to understand this would be greatly appreciated.
  
  And is there something that can be done to keep the table PROCEDURE_FACT (the central table of our star schema) "pinned" in the buffer cache?
  
  Thanks in advance.
  
  -chris Curzon

  Christopher Curzon wrote:
  Your comment about the buffer cache used for smaller objects that benefit is something that I asked about a good deal. It sounds as if tuning the buffer cache will have little impact on queries that scan of entire tables.

  Chris,

  If you can afford it and you think it is a reasonable approach with regard to the remaining segments that are supposed to benefit the buffer cache, you can always consider your segment of table with 'CACHE' that will change the behavior on the full of a broad sector table scan (Oracle treats small and large segments differently during the execution of table scans complete regarding the cache of) marking stamps, you can override this treatment by using the CACHE. NOCACHE keyword) or move your table of facts to a DUNGEON hen establishing a (ALTER SYSTEM SET DB_KEEP_CACHE_SIZE = ), modify the segments (ALTER TABLE... STORAGE (USER_TABLES KEEP)) accordingly and perform a full table scan to load blocks in the cache of the DUNGEON.

  Note that the disadvantage of the approach of the KEEP pool is that you have less memory available for the default buffer cache (unless you add more memory on your system). When an object to mark as being cached is always is in competition with other objects in the cache buffers by default, so it could still be aged out (the same applies to the pool of DUNGEON, if the segment is too large or too many segments are allocated age blocks out as well).

  So my question: How can I get for a parallel analysis on queries that use a table scan complete such as what I posted in my previous email? It is a question of the provision of the "parallel" indicator, or is it an init.ora parameter I should try?

  You can use a PARALLEL hint in your statement:

  SELECT /*+ PARALLEL(PROCEDURE_FACT) */ DATA_SOURCE_CD, COUNT(*)
  FROM PROCEDURE_FACT
  GROUP BY DATA_SOURCE_CD;
  

  or you could mark an object as PARALLEL in the dictionary:

  ALTER MATERIALIZED VIEW PROCEDURE_FACT PARALLEL;
  

  Note that since you have 16 processors (or 16 cores that resemble Oracle 32? Check the CPU_COUNT setting) the default parallel degree would be usually 2 times 16 = 32, which means that Oracle generates at least 32 parallel slaves for a parallel operation (it could be another set of 32 slaves if the operation for example include a GROUP BY operation) If you do not use the PARALLEL_ADAPTIVE_MULTI_USER parameter (which allows to reduce the parallelism if several parallel operations running concurrently).

  I recommend to choose a lesser degree parallel to your default value of 32 because usually you gain much by such a degree, then you can get the same performance when you use lower a setting like this:

  SELECT /*+ PARALLEL(PROCEDURE_FACT, 4) */ DATA_SOURCE_CD, COUNT(*)
  FROM PROCEDURE_FACT
  GROUP BY DATA_SOURCE_CD;
  

  The same could be applied to the paralleling of the object:

  ALTER MATERIALIZED VIEW PROCEDURE_FACT PARALLEL 4;
  

  Note When defining the object of many operations in PARALLEL will be parallelisee (DML even can be run in parallel, if you enable dml parallel, which has some special restrictions), so I recommend to use it with caution and begin with an explicit indication in those statements where you know that it will be useful to do.

  Also check that your PARALLEL_MAX_SERVERS is high enough when you use parallel operations, which should be the case in your version of Oracle.

  Kind regards
  Randolf

  Oracle related blog stuff:
  http://Oracle-Randolf.blogspot.com/

  SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
  http://www.sqltools-plusplus.org:7676 /.
  http://sourceforge.NET/projects/SQLT-pp/

• Can I activate the Apple logo lit on the back of my 30 inch Apple display?

  Can I activate the Apple logo lit on the back of my 30 inch Apple display?

  It would be cool to see!

  It would be cool, but I don't think it was an aspect of the design. The back of my screen to the wall. The size and the quality of the image and the glass, I think, speaks for itself. The black Apple logo on finely designed aluminum case is very well see when switching from an office. We'll let the glowing Apple logos to Mac Air and MacBooks.

  Bravo!