cache invalid result

Similar Questions

• Model for caching the results of database queries?

  I am interested in the caching of certain common and slow query results in a cache consistency and would like some suggestions on models of 'good '.
  
  In this case you would use a cache next to the model to the data stored in the cache/database where all updates are written to the cache and the database using a XA transaction (we need to do it this way because there are certain requirements of coherence that are difficult to check (at least with correct performance) by using only the cache). We intend to use a "near cache" with a rear limited size.
  
  We plan to invalidate the "saved query result cache" as part of each transaction update (we have a few simple rules which determine what query results that must be discarded for each change).
  
  The part that is a bit tricky is to make sure that no application is perhaps underway while an update of the data related to the query is also underway where the invalidation might be carried out until the result of the query is inserted in result cache... I am not concerned about order of exact time between queries and updates that are ongoing at the same time, but must be 100% sure that no "outdated" information remains (or can be inserted!) in the cache after the update was signed...
  
  It is not enough to rely on the expiration of the time based on the result cache (I would have to set the time so short that the cache would not give a lot of improvement)
  
  I think something like the following:
  
  When you perform a query (which can already caching):
  
  1. do a dirty read against the result cache to determine if a query with the specified result already exists here - if so use it!
  2. If it is not found lock, a key with the specified parameter, and when the lock is obtained to check once more that there is still no value, if there now to unlock and use it!
  3. If there is still no value run the database query, save the result in the cache, unlock and use the result
  
  
  When you make a change using a XA transaction:
  Remove records from query results in the cache corresponding to the changes - this can be done without first checking if there is really no result for the parameter or not.
  I guess the stage of preparation of the transaction will lock the deleted records in the cache of query result preventing the invalidations and simultaneous updates...
  
  Everyone sees a few windows of vulnerability here? For example, it is possible that the cache owned by the XA transaction lock is released before the update of the database has finished (thus a request could be carried out against the old data and be stored in the cache after the invalidation have been performed) or what exactly the kind of problems that the XA protocol designed to prevent?
  
  An alternative I've been thinking about how to run the database query / caching the result would be to leave a store class hides (for query result cache) execute queries when no entries exist in the cache, but I don't know how I would change the locking protocol to make it work - can I still lock a cache by this type or component entry , or which would result in a block?
  
  Suggestions, thoughts etc. are much appreciated!
  
  Best regards
  Magnus

  Hi Magnus,

  Everyone sees a few windows of vulnerability here? For example, it is possible that the cache owned by the XA transaction lock is released before the update of the database has finished (thus a request could be carried out against the old data and be stored in the cache after the invalidation have been performed) or what exactly the kind of problems that the XA protocol designed to prevent?

  If the query is executed as you described and your application can take the same lock of keys to query before you update the data and only released the lock, once the transaction is complete, you can be assured that a query based on outdated information will not be cached after the transaction. If you want to be sure that no stale query results will be returned, remove the result cached outside of the transaction just before the validation of the transaction.

  An alternative I've been thinking about how to run the database query / caching the result would be to leave a store class hides (for query result cache) execute queries when no entries exist in the cache, but I don't know how I would change the locking protocol to make it work - can I still lock a cache by this type or component entry , or which would result in a block?

  I think that you can implement a class of dumps for query result cache that can be used to provide the appropriate locking device. If implemented correctly, I don't think that there is a risk of blocking.

  Kind regards

  Harv

• OTA update HP 8 1401 failed: E: could not mount/cache (invalid argument)

  I made an attempt of using OTA upgrade to the latest version of the firmware from HP 8 1401 (2014-07-22, Version2.0.4, 452.51 M)

  the update seems to have failed (don't know why)

  The tablet can not enter in recovery mode more (power + volume up) and product of n several times messages below:

  E: failed to mount/cache (invalid argument)
  E: failed to set up the media planned to install; abandonment
  installation abandoned
  E: failed to mount/cache (invalid argument)
  E:cant mount/cache/recovery/log
  E:cant open the recovery log / / cache /
  E: failed to mount/cache (invalid argument)
  E:cant mount/cache/recovery/last_log

  ....

  What can we do to solved this problem?

  I have no any attempt to root or break this system. just skip to the last available OS.

  T.

  Supported by contacted HP and they chose the Tablet for repairs.

• Fix the activation parameters for caching the results of the customer? No performance gain

  I gathered and made every detail I could search. I use Oracle EE 11.2 g 32-bit on Windows 7 64 bit
  
  But despite I activate client caching result, I see no difference response API despite I have remote, connect to the server on LAN 1Gbit network
  
  I see > difference 1 sec only when you enable caching of server (2nd opening files 300% faster 57 dry-> 18 s) and 32 MB are cached for the opening.
  I don't know how to see the client_result_cache except the network traffic, detours, IO
  MEASURES_
  * 1.* I activated the parameter setting Statement Caching on the client and dbhome and set it equal to my ora.ini file OPEN_CURSORS (300) the registry as possible. And rebooted the system, of course.
  ---------
  HKEY_LOCAL_MACHINE > SOFTWARE > Wow6432Node > ORACLE > KEY_OraClient11g_home1 > OLED > StmtCacheSize
  HKEY_LOCAL_MACHINE > SOFTWARE > Wow6432Node > ORACLE > KEY_OraDb11g_home1 > OLED > StmtCacheSize
  -There is no standard oracle registry dir - probably cause its 64 bit +.
  -* 2 I have Super-activated all relevant SYSTEM parameters. 3 X the size necessary to be cached, FORCED cach, 100% of the result, 600000ms lag(10min)
  -------
  client_result_cache_lag... large integer 600000
  client_result_cache_size... great integer.100M
  ...
  db_cache_advice... chain... WE
  db_cache_size... large integer 0
  ...
  ... full object_cache_max_size_percent... 10
  ... full object_cache_optimal_size... 102400
  ... full result_cache_max_result... 100
  result_cache_max_size... big integer.100M-this is for caching wright + server
  result_cache_mode... chain... FORCE
  ... full result_cache_remote_expiration... 30
  session_cached_cursors... around... 50
  -Is everything OK? Why not better time response then?
  The LAN 1Gbit 1 customer is perhaps too fast anyway, and I should try via internet or something?
  
  Hope that you have an idea, I can't search to find or think of something.

  As said by John, SQL * Plus does not implement caching the result to the client. You write an application for OIC (or another application that knows the OIC calls appropriate to make) that implements the setting cache the result of the customer.

  Your test is behaving as expected.

  Justin

• Near Cache invalidation events are always sent asynchronously?

  Can someone tell me if near Cache invalidation events are always sent asynchronously regardless of the defeat strategy?
  
  I just read the book of the Oracle coherence 3.5 of Packt publishing and he says that with the invalidation of strategy 'Présent' events are always sent asynchronously, which means that there will be a small window of time when the front cover is out of date. However the "All" section doesn't mention anything on this subject so am I correct to assume that the strategy of 'All' will be synchronous?
  
  If there is a difference, then I'm surprised that the documentation of consistency not accentuates this as this seems to be an important factor.
  
  Published by: Simon on June 18, 2010 05:14

  Hi Patrick,

  so this would mean that in the case of a cache of nearly, another node may still get the old value of the cache close even if the NamedCache original call has already returned, which is a lower guarantee than what you have with partitioned cache.

  In fact, what is the case with replicated cache? It is ensured that the change is propagated to other nodes until the local call returns in the case of a replicated cache?

  Best regards

  Robert

• caching the results of database in one of your software applications?

  Have you had results of database cache in one of your software applications? What are the advantages and the pitfalls developers must be informed when caching the results of database.
  
  Please answer...
  
  
  ... thnks.

  We have cached the results of database cache on the client side, partially (in tables and files on OS as well). But this caching is limited to data purely STATIC (which is no change under any circumstances).

  Our application depends on a lot of static data and we managed to reduce 10% of band with this implementation network bandwidth.

  We tried to use the cache for the not-so-static data client-side but had a lot of problems associated with updating the same thing if we came back this change.

  On a side note, it reminds me of the cache of the client available in Oracle 11 g result.

  http://download.Oracle.com/docs/CD/B28359_01/server.111/B28279/Chapter1.htm#FEATURENO06989

  See if it helps you.

• Caching the result of OSB: expiration

  Hello

  Anyone know if it is possible to replace the TTL value (defined at design time) of the result while deploying caching (using the example or WLST customization file?).

  Kind regards

  Mathieu

  or you can create a script ant with xmltask to find/replace the expression directly in your business service file.

  We also use it to add sla during deployment

• Library cache invalidation

  Hi all
  
  When I review a query using extended track that took 10 minutes to finish in production, I noticed the following.
  
  
  Production environment
  --------------------------------
  OPERATING SYSTEM: HP - UX 11
  Database: Oracle 10.2
  Audit: WE (actually, heavy, about 177 policies are on in addition to 57 MeV)
  Data Warehouse using Business Objects
  
  
  Observation of tkprof output
  ---------------------------------------------
  
  
  TOTALS FOR ALL NON RECURSIVE INSTRUCTIONS
  
  call the query of disc elapsed to cpu count current lines
  ------- ------ -------- ---------- ---------- ---------- ---------- ----------
  Parse 2 0.44 0.42 0 0 0 0
  Run 2 0.01 0.00 0 0 0 0
  Pick up 84 4.34 5.05 1303 3522 0 1235
  ------- ------ -------- ---------- ---------- ---------- ---------- ----------
  Total 88 4.79 5.48 1303 3522 0 1235
  
  Chess in the library during parsing cache: 1
  
  Elapsed time are waiting on the following events:
  Event waited on times max wait for the Total WHEREAS
  ---------------------------------------- Waited ---------- ------------
  SQL * Net message to client 85 0.00 0.00
  SQL * Net client message 85 66,91 66.95
  SQL * Net more data from client 1 0.00 0.00
  DB file sequential read 14 0.01 0.09
  latch: allocation session 1 0.00 0.00
  db file scattered read 326 0.53 0.02
  latch: shared pool 2 0.00 0.00
  latch: cache library 1 0.00 0.00
  
  
  TOTALS FOR ALL RECURSIVE INSTRUCTIONS
  
  call the query of disc elapsed to cpu count current lines
  ------- ------ -------- ---------- ---------- ---------- ---------- ----------
  Parse 7121 0.68 0.56 0 0 0 0
  Run 21847 6.53 6.31 0 0 0 6998
  Search 15396 686.64 674,91 2364 22572060 0 21579
  ------- ------ -------- ---------- ---------- ---------- ---------- ----------
  Total 44364 693.85 681,79 2364 22572060 0 28577
  
  Chess in the library during parsing cache: 36
  Lack in the cache of the library during execution: 38
  
  
  The figures for non-recursive don't look too bad but recursive seems bad (I think this is mainly because the audit). I inherited this database, and I plan to make a recommendation to reduce the number of checks in place. In the meantime, I'm trying my best to improve the situation regarding the absences of the library cache. The shared pool is currently 400 m and here are some of my observations...
  
  
  SELECT INVALIDATIONS, PINHITS, NAMESPACE, RELOADS, PINES
  V $ LIBRARYCACHE
  ORDER OF NAMESPACE;
  
  NAMESPACE PINHITS INVALIDATION RECHARGE PINES
  
  3582593 3581741 362 BODY 0
  14296 13932 179 CLUSTER 0
  132338 112879 7460 INDEX 0
  GIVEN JAVA 0 0 0 0
  RESOURCES JAVA 0 0 0 0
  JAVA SOURCE 0 0 0 0
  OBJECT 0 0 0 0
  PIPE 0 0 0 0
  AREA 283694927 281523185 267596 SQL * 118090 *.
  215851629 215588814 105599 TABLE/PROC 0
  5890804 5889652 986 RELAXATION 0
  
  
  Select sum (pinhits) /sum (pine) in V$ LIBRARYCACHE
  0.9951717580770384466008350939793460248477
  
  
  SELECT V $ SGASTAT *.
  WHERE NAME = 'free mΘmoire '.
  AND POOL = 'pool'
  
  49920768 (12:00 day value)
  
  
  Based on the fact that there are 118 090 invalidations SQLAREA within 2 days (database was restarted Saturday) and the following information in the trace sql sql which I was followed Sunday.
  
  Total amount for recursive statements
  ---------------------------------------------------
  Chess in the library during parsing cache: 36
  Lack in the cache of the library during execution: 38
  
  
  I intend to increase the shared_pool of 400 to 600M and 160 M to 250 M large_pool (sqls many parallel boards in them). I don't don't parallel queries in memory of shared_pool. Please let me know if I'm on the right track or suggestions.
  
  Thanks for your time.

  Hello

  Look at what query on V$ SHARED_POOL_ADVICE will propose before changing the shared pool.

  Kind regards

• sdo_within_distance return invalid results

  I use sdo_within_distance, and I notice that there are cases where results contain geometries that are outside the distance, I said. In the example below, the geometry is returned even if it is 4 miles from the reference geometry. If I use sdo_nn with the remote setting, the correct results are returned. DB version is 12.1.0.1.0

  Create the table testdistance

  (

  Identification number,

  geom sdo_geometry

  );

  Insert into testdistance (ID, GEOM) values (1, MDSYS. SDO_GEOMETRY (2001,4326, MDSYS. SDO_POINT_TYPE(-117.234313964844,32.7089462280273,), NULL, NULL));

  Insert into testdistance (ID, GEOM) values (477488906, MDSYS. SDO_GEOMETRY (2003,4326, NULL, MDSYS. SDO_ELEM_INFO_ARRAY (1,1003,1), MDSYS. SDO_ORDINATE_ARRAY(-117.175918579102,32.6773681640625,-117.17529296875,32.6780090332031,-117.174987792969,32.6778030395508,-117.17561340332,32.6771392822266,-117.175918579102,32.6773681640625)));

  insert into (table_name, column_name, diminfo, srid) user_sdo_geom_metadata

  values ('TESTDISTANCE', "GEOM", MDSYS. SDO_DIM_ARRAY (MDSYS. SDO_DIM_ELEMENT ('Longitude',-180, 180, 0.05), MDSYS. SDO_DIM_ELEMENT('Latitude',-90,90,0.05)), 4326);

  create index testdistance_sidx on testdistance (geom) INDEXTYPE IS MDSYS. SPATIAL_INDEX;

  -results of evil

  WITH the entry INTO

  (SELECT / * + materialize * / idgeom )

  OF testdistance

  ID WHERE = 1

  )

  SELECT / * + index (testdistance, testdistance_sidx) * / testdistance.id, testdistance.geom, sdo_geom.sdo_distance (testdistance.geom, input.geom, 0.05, ' unit = mile') dist

  Testdistance entry

  WHERE sdo_within_distance (testdistance.geom, input.geom, 'distance = 2.5 unit = mile') = 'TRUE '.

  -correct results

  WITH the entry INTO

  (SELECT / * + materialize * / idgeom )

  OF testdistance

  ID WHERE = 1

  )

  SELECT / * + index (testdistance, testdistance_sidx) * / testdistance.id, testdistance.geomSDO_NN_DISTANCE (1) dist

  Testdistance entry

  WHERE sdo_nn (testdistance.geom, input.geom, 'distance = 2.5 thousand = unit', 1) = "TRUE".

  Geometry with id = 477488906 is not valid because its outer ring is

  in a clockwise direction. You can use the following query to check them.

  Select sdo_geom.validate_geometry (geom, 0.05), id testdistance;

  Once the geometry with id = 477488906 is corrected (e.g. using sdo_util.rectify_geometry),

  the result of sdo_within_distance() should be good.

• Optimization of a script with caching the results of Get - VM

  Hi, the project I have been work on front, but another question.

  I create a menu driven interface to run common commands against multiple machines. The script reads the names of machine from a text file using Get-Contentand then use Get-VM to get the objects on which it operates.

  As the Get-VM cmdlet takes a long time to run, I'm looking for a way to "hide" these objects if they have already been retrieved, rather than have them each time.

  So, you need:

  Check if the objects have already been retrieved; If it is not she should get the objects of the VM, cache, and then continue with its operation. It should also check that the entry in the text file has not changed since the cache was created.

  I have attached the CURRENT script if you want a look.  Other suggestions to improve this last would be welcome.

  You can use the last write date of the input file to check if it has been modified.

  For this time you can use

  $strLastWriteTime = (Get-Item $strVMList).LastWriteTime
  

  Computer virtual objects can be stored in a table.

  Only read the VM objects even if you connect to another server in VC or TXT file has been changed.

  $arrVMList =Get-Content $strVMList
  $arrVMobj = Get-VM $arrVMList
  

  I tried to apply this in your script.

  I used a few global variables to store the required information.

  Take a look.

• Browser is caching the result of HTTPRequest: S

  I have an XML external, filled with images.
  Today, I added 2 new images but my watch the old web,
  Looks like browser displaying old data due to caching.
  
  How to solve?

  If the xml is an asset to your home directory of the Flex project structure and exported, you should try the project under the Project menu of cleaning. If he is sitting, waiting on the server, which is obvious (broswer cache) is a double control value.,.

• Invalid results based on the select list

  Hello
  I've set up 4 LOVs cascading in a test application. They fill each value based on the value of the parent cascading with success. My example is based on the query Ajax Denes Kubicek - Section III - for example - http://apex.oracle.com/pls/otn/f?p=31517:135:1771969688591802:NO. But I use 4 Cascading Select list not 4 text fields. My problem is that I am not able to scroll through records using the previous and next unless I select all 4 list selection of waterfall to fill the data in the record. I would like to be able to select the 1st list select then click on the search button to fill in the data of the registration for the selected value. Then use the previous and next to scroll through the data in the record. This code allows selection of cascade 4 list to keep focus when the key search selected. But the correct data are not returned if I only select 1 list select value and then click on the search button.

  //  alert('TagName=' + l_El.tagName + ' id=' + l_El.id)
                  if(l_El.tagName == 'INPUT' || l_El.tagName == 'SELECT') {
                      l_El.value = l_Value;

  Published by: Charles was October 8, 2009 07:53

  Hi Charles,

  OK - it works now.

  I made a few changes here and there. Basically, I defined by default for four '-1' lists and accounted for this through the page and processes. You had the wrong name for the last item in your function onLoad(), so I've changed that. Also notes that the question of the "closing date" must be formatted with a date MM/DD/YYYY formats to ensure that these are properly (the date of default real format came in the form DD-MON-AA, so you would have questions there if you don't stick to a single format). For each item, you can choose another value by default if it makes more sense for you, but you go through every place where the list is mentioned/used for updating the-1 for her to this new value.

  The processes themselves also tried to update the four lists as you go through the records. As the lists would not necessarily have all the values on them (you can click on search without making any selection, for example), I disabled these bits. However, you you should consider adding to the class section of THS page as new, so that the user can view all the information. The alternative would be to have all the lists display all the values unless otherwise filtered by their parent list - always feasible, but may be confused?

  Andy

• Update statement can be used depending on the result cache?

  Hi all

  I stumbled on an interesting question. UPDATE statement is used in the following function, even if the feature is created RESULT_CACHE. It seems illogical. I was wondering, is it possible?

  If so, why RESULT_CACHE is used?  Because it means "do not execute the function, look for the result of the hash table and return the results to the user ' if the UPDATE statement, so doesn't mean it should run for each call and use with RESULT_CACHE and UPDATE/DELETE/MERGE is illogical or wrong?

  Thanks for your help.

  FUNCTION to CREATE or REPLACE plch_get_data (FULL id_in)

  RETURN VARCHAR2

  RESULT_CACHE

  IS

  BEGIN

  Dbms_output.put_line ('run');

  UPDATE plch_data

  SET nm = UPPER (nm)

  WHERE id = id_in;

  COMMIT;

  RETURN "SUPERIOR."

  END;

  /

  Yes, it's the challenge of PL/SQL quiz - and the point of the quiz is only automatic relies on parsing by Oracle only supports arrays of account that is QUESTIONED.

  The tables that are affected by DML not a query as an update do not figure in automatic invalidation of a cache.

  I was hoping that the explanations given in the questionnaire itself would not lead to a thread - rather it would provide a pleasant and clear answer. So feel free to let me know if you think otherwise.

  As to why Oracle would let you include DML not a query inside a function of caching of result, well... I can easily accept that you shouldn't do this - in general. But I don't see that we should make it impossible. It would probably be a good candidate for an another PLW (PL/SQL warning), as in:

  "Non-requetes DML in a result caching function will not affect caching and can result in unexpected results."

• Negative result, caching, son of aggregation

  I have two questions:
  
  1. perform one of the coherence caches 'negative' caching the result? An example to explain what I mean:
  I have a near cache under a partitioned cache, which is supported by a database. I do a get looking in the cache, partitioned cache and DB and does not find the value. If I don't then get another for the same consistency key will go all the way to the DB again to look for? ContainsKey works the same way?
  
  
  2. This is to increase the number of threads used for aggregation on a node unique consistency? I have a machine with lots of carrots and a parallel aggregator that uses a bit of CPU. I wish that consistency to run multiple instances of the aggregator in parallel without me having to start the process.

  CormacB wrote:
  I have two questions:

  1. perform one of the coherence caches 'negative' caching the result? An example to explain what I mean:
  I have a near cache under a partitioned cache, which is supported by a database. I do a get looking in the cache, partitioned cache and DB and does not find the value. If I don't then get another for the same consistency key will go all the way to the DB again to look for? ContainsKey works the same way?

  Hi Cormac,

  reading / writing support cards can make Miss caching.

  Look at the documentation of the child of element of the element:

  http://coherence.Oracle.com/display/COH34UG/read-write-backing-map-scheme

  This allows you to cache the ladies in the database. Caching misses on the front near cache plan should not be made as it would break the access cache semantics closely because the front plane contains usually only a portion of the total data set not least because its entries are invalidated on changes to other nodes.

  >

  2. This is to increase the number of threads used for aggregation on a node unique consistency? I have a machine with lots of carrots and a parallel aggregator that uses a bit of CPU. I wish that consistency to run multiple instances of the aggregator in parallel without me having to start the process.

  Yes, as you mentioned the child of the element on the is your friend. By default, you can also set its value with the following Java property:

  -Dtangosol.coherence.distributed.threads=...
  

  Best regards

  Robert

• Using the ODP client result cache still shows it as running on AWR, is the work of cache?

  Hello

  I use the Oracle 12 manged customer ODP.net connected to a database of GR 11, 2. I recently went on the cache of results with great effectiveness.

  So, I thought I would try the result to the client cache. I have the setting turned on and restarted my db, but my questions always appear in the graphs of Enterprise manager and the AWR report. I would have thought if the query has been cached on the client, that it does not show.

  How will I know if it works or not?

  Thanks in advance.

  Adrian.

  Re-reading the original question, I missed the fact that you use managed ODP.NET. The client result cache does not support managed ODP.NET. Only unmanaged ODP.NET is because it uses the capacity, within the OIC, that uses the unmanaged code.

  I apologize for the misunderstanding.