How do i endable cache
duplicate of [/questions/961231]
I need to enable cache so i can do my school work.
The best way to do this is simply to boot into Safe Mode.
Here's what to do:
1. Restart your computer
2. Just as you hear the chime sound and see a white screen on startup, hold down the shift key
3. You will see a progress bar as your computer boots into safe mode and clears your cache.
4. Simply restart normally, and your cache is clear.
Good luck!
Similar Messages
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How to create a cache for JPA Entities using an EJB
Hello everybody! I have recently got started with JPA 2.0 (I use eclipseLink) and EJB 3.1 and have a problem to figure out how to best implement a cache for my JPA Entities using an EJB.
In the following I try to describe my problem.. I know it is a bit verbose, but hope somebody will help me.. (I highlighted in bold the core of my problem, in case you want to first decide if you can/want help and in the case spend another couple of minutes to understand the domain)
I have the following JPA Entities:
@Entity Genre{
private String name;
@OneToMany(mappedBy = "genre", cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Collection<Novel> novels;
@Entity
class Novel{
@ManyToOne(cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Genre genre;
private String titleUnique;
@OneToMany(mappedBy="novel", cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Collection<NovelEdition> editions;
@Entity
class NovelEdition{
private String publisherNameUnique;
private String year;
@ManyToOne(optional=false, cascade={CascadeType.PERSIST, CascadeType.MERGE})
private Novel novel;
@ManyToOne(optional=false, cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Catalog appearsInCatalog;
@Entity
class Catalog{
private String name;
@OneToMany(mappedBy = "appearsInCatalog", cascade = {CascadeType.MERGE, CascadeType.PERSIST})
private Collection<NovelEdition> novelsInCatalog;
The idea is to have several Novels, belonging each to a specific Genre, for which can exist more than an edition (different publisher, year, etc). For semplicity a NovelEdition can belong to just one Catalog, being such a Catalog represented by such a text file:
FILE 1:
Catalog: Name Of Catalog 1
"Title of Novel 1", "Genre1 name","Publisher1 Name", 2009
"Title of Novel 2", "Genre1 name","Pulisher2 Name", 2010
FILE 2:
Catalog: Name Of Catalog 2
"Title of Novel 1", "Genre1 name","Publisher2 Name", 2011
"Title of Novel 2", "Genre1 name","Pulisher1 Name", 2011
Each entity has associated a Stateless EJB that acts as a DAO, using a Transaction Scoped EntityManager. For example:
@Stateless
public class NovelDAO extends AbstractDAO<Novel> {
@PersistenceContext(unitName = "XXX")
private EntityManager em;
protected EntityManager getEntityManager() {
return em;
public NovelDAO() {
super(Novel.class);
//NovelDAO Specific methods
I am interested at when the catalog files are parsed and the corresponding entities are built (I usually read a whole batch of Catalogs at a time).
Being the parsing a String-driven procedure, I don't want to repeat actions like novelDAO.getByName("Title of Novel 1") so I would like to use a centralized cache for mappings of type String-Identifier->Entity object.
Currently I use +3 Objects+:
1) The file parser, which does something like:
final CatalogBuilder catalogBuilder = //JNDI Lookup
//for each file:
String catalogName = parseCatalogName(file);
catalogBuilder.setCatalogName(catalogName);
//For each novel edition
String title= parseNovelTitle();
String genre= parseGenre();
catalogBuilder.addNovelEdition(title, genre, publisher, year);
//End foreach
catalogBuilder.build();
2) The CatalogBuilder is a Stateful EJB which uses the Cache and gets re-initialized every time a new Catalog file is parsed and gets "removed" after a catalog is persisted.
@Stateful
public class CatalogBuilder {
@PersistenceContext(unitName = "XXX", type = PersistenceContextType.EXTENDED)
private EntityManager em;
@EJB
private Cache cache;
private Catalog catalog;
@PostConstruct
public void initialize() {
catalog = new Catalog();
catalog.setNovelsInCatalog(new ArrayList<NovelEdition>());
public void addNovelEdition(String title, String genreStr, String publisher, String year){
Genre genre = cache.findGenreCreateIfAbsent(genreStr);//##
Novel novel = cache.findNovelCreateIfAbsent(title, genre);//##
NovelEdition novEd = new NovelEdition();
novEd.setNovel(novel);
//novEd.set publisher year catalog
catalog.getNovelsInCatalog().add();
public void setCatalogName(String name) {
catalog.setName(name);
@Remove
public void build(){
em.merge(catalog);
3) Finally, the problematic bean: Cache. For CatalogBuilder I used an EXTENDED persistence context (which I need as the Parser executes several succesive transactions) together with a Stateful EJB; but in this case I am not really sure what I need. In fact, the cache:
Should stay in memory until the parser is finished with its job, but not longer (should not be a singleton) as the parsing is just a very particular activity which happens rarely.
Should keep all of the entities in context, and should return managed entities form mehtods marked with ##, otherwise the attempt to persist the catalog should fail (duplicated INSERTs)..
Should use the same persistence context as the CatalogBuilder.
What I have now is :
@Stateful
public class Cache {
@PersistenceContext(unitName = "XXX", type = PersistenceContextType.EXTENDED)
private EntityManager em;
@EJB
private sessionbean.GenreDAO genreDAO;
//DAOs for other cached entities
Map<String, Genre> genreName2Object=new TreeMap<String, Genre>();
@PostConstruct
public void initialize(){
for (Genre g: genreDAO.findAll()) {
genreName2Object.put(g.getName(), em.merge(g));
public Genre findGenreCreateIfAbsent(String genreName){
if (genreName2Object.containsKey(genreName){
return genreName2Object.get(genreName);
Genre g = new Genre();
g.setName();
g.setNovels(new ArrayList<Novel>());
genreDAO.persist(t);
genreName2Object.put(t.getIdentifier(), em.merge(t));
return t;
But honestly I couldn't find a solution which satisfies these 3 points at the same time. For example, using another stateful bean with an extended persistence context (PC) would work for the 1st parsed file, but I have no idea what should happen from the 2nd file on.. Indeed, for the 1st file the PC will be created and propagated from CatalogBuilder to Cache, which will then use the same PC. But after build() returns, the PC of CatalogBuilder should (I guess) be removed and re-created during the succesive parsing, although the PC of Cache should stay "alive": shouldn't in this case an exception being thrown? Another problem is what to do when the Cache bean is passivated. Currently I get the exception:
"passivateEJB(), Exception caught ->
java.io.IOException: java.io.IOException
at com.sun.ejb.base.io.IOUtils.serializeObject(IOUtils.java:101)
at com.sun.ejb.containers.util.cache.LruSessionCache.saveStateToStore(LruSessionCache.java:501)"
Hence, I have no Idea how to implement my cache.. Can you please tell me how would you solve the problem?
Many thanks!
ByeHi Chris,
thanks for your reply!
I've tried to add the following into persistence.xml (although I've read that eclipseLink uses L2 cache by default..):
<shared-cache-mode>ALL</shared-cache-mode>
Then I replaced the Cache bean with a stateless bean which has methods like
Genre findGenreCreateIfAbsent(String genreName){
Genre genre = genreDAO.findByName(genreName);
if (genre!=null){
return genre;
genre = //Build new genre object
genreDAO.persist(genre);
return genre;
As far as I undestood, the shared cache should automatically store the genre and avoid querying the DB multiple times for the same genre, but unfortunately this is not the case: if I use a FINE logging level, I see really a lot of SELECT queries, which I didn't see with my "home made" Cache...
I am really confused.. :(
Thanks again for helping + bye -
How do I clear cache and cookies on my ipad
How do I clear cache and cookies on my ipad? I was told to do this when I was trying to download ebooks to ibooks and kindle
Settings/safari/clear history;clear cookies and data
-
How do I delete caches in Lion and which can I delete?
How do I delete caches in Lion and which ones can be deleted?
you can delete all of them, they will be recreated as soon as the app opens again.
Clearing Local Caches
quit all open apps
open Finder press "shift+command+G" and type ~/Library/Caches
Drag all files and folders to the trash
Enter login password when prompted
Reboot
your system may seem slower after reboot, this is because the caches are being rebuilt.
Clearing Application Caches
quit all open apps
open Finder Press "shift+command+G" and type /Library/Caches
Drag all files and folders to the trash
Reboot -
How do I empty "cache"?
The best way to do this is simply to boot into Safe Mode.
Here's what to do:
1. Restart your computer
2. Just as you hear the chime sound and see a white screen on startup, hold down the shift key
3. You will see a progress bar as your computer boots into safe mode and clears your cache.
4. Simply restart normally, and your cache is clear.
Good luck! -
How to clear app cache on itouch (3.1.3 iOS)
can someone help with directions on how to clear app cache in 3.1.3? btw...i don't want to reset since it will result in lost apps that no longer offer versions for 3.1.3
All you can do is reset the iPod. Nothing is lost
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
For the old-app problem. Delete any newer apps from your iTunes library. Then transfer iTunes purchases to the computer by:
iTunes Store: Transferring purchases from your iOS device or iPod to a computer
Just make sure that you do not update those apps in your iTunes library. -
How to install metadata cache invalidation tool
Hi,
I have a problem in using JCO destinations for Adaptive RFC models.
I went through the below pdf and they mentioned metadata cahce invalidation tool and it is not installed in the portal
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10465350-b4f5-2910-61ba-a58282b3b6df
please let me know how to install metadata cache invalidation tool
points will be rewarded for sure for the helpful answersThis tool is already installed on your system.
1) navigate to http://<hostname>:<port>/index.html
2) Click on "Webdynpro"
3) Click on "Web Dynpro Console"
3) Login as an Administrator (any user with admin priv's is ok).
4) Notice the last entry in the list -
How to clear the cache files in folder Temporary Internet Files
When one user opens files such as pdf. or doc. from Portal, the same file will be downloaded into the Temporary Internet Files folder. if another user copied the files out of the Temporary Internet Files folder from this computer and save to someplace else, then we face one security problem.
So my question is: How to clear the cache files in folder Temporary Internet Files?? Can we delete the files automatically when close the files in Portal??
or is there some ways to make encrypty???
Thanks very much!Hello,
this is a basical security problem which should be resolved by the OS standard security setup . No other user should have access to the temporary file folders in the personal directory. The user account must be secure. Normaly your security problem should not be a problem if basic security exists on the clients.
You can resolve this problem if every user has his own account on the client
The users having no administration permissions on the clients
The folder for the temporary internet files is placed in the personal profile folder of the user account.
On default no other user has access rights to you personal folder, this means the client OS is setup correctly.
You can setup the IE that no temporary files are saved (but it reduces performance)
You can enable IE to delete automaticly the temporary files if IE is closed.
Hope it helps.
Regards
Alex -
How to delete Message cache without bouncing web server?
When a message ( FND_NEW_MESSAGES) that is used in a OA Framework page is updated, it is not reflected in the OA web page right away.
Clearing cache through Functional Administrator does not help for messages.
How to delete message cache so that a OA Framework page shows updated message text? Is there any way other than bouncing web server?
Please let me know.
ThanksHi,
I think clearing cache through Functional Administrator should do.
You can try the below process...
Search for "_pages" (get in touch with DBA to know exact path) in $COMMON_TOP and remove using command "rm -Rf _pages". Then clear cache through Functional Administrator.
Let us know if this helps.
Regards,
Anand -
How much data canbe cache in SGA
Hai everybody,
my company using Oracle 11g 11.2.0.1.0 - Production database, my os is RHEL 5.5 ,my server's physical memory is 30.9 GB ( cat /proc/meminfo ) ie the SGA size [ (30.9*40/100)=12.5 GB ] so i use 12.5GB SGA size for one instance, we need to cache some data for our application performance how much data can cache in SGA based on 12.5 GB or how to calculate how much data can cache in SGA without any performance degradation.
Regards BenkAman has it right. WHY?
the keep pool, alter table cache, etc - I would not be doing ANY of these without a good reason.
Often times, people think that forcing a table to stay in the cache is a good idea. It rarely is. If you want things in the cache, use them. If they are used, they will naturally have their blocks cached. If you don't use them, they can get flushed out. But if you don't use them, why do you want them using memory that could better be used by other things?
My advice: don't try to second-guess Oracle's memory management and caching strategy. If you think you have a reason to, post it here and we can help you (or debunk your reason). Based on the fact that you've apparently calculated the SGA using that silly, meaningless "rule" that says give it 40% of your total RAM, I'd guess that you are looking around for a magic bullet, and you don't actually have a problem to solve.
John -
How to Configure Transparent caching on Cat 6500 with CSM in bridge mode?
hi.
I found How to Configure Transparent caching on Cat 6500 with CSM in routed mode.
But,
I need help How to Configure Transparent caching on Cat 6500 with CSM in bridge mode?
Please let me know sample configuration.
thanks.Hi,
I wrote the document you mentioned and I also wrote the one below.
http://www.cisco.com/en/US/partner/products/hw/modules/ps2706/products_configuration_example09186a00802c1201.shtml
The one with the SSLM is a bridge mode config.
If you replace the SSLM with a cache [or a farm of caches] it would be a similar config.
Replace the SSL21 vserver with an HTTP vserver [most important is to keep the vlan configured on each vserver]
Regards,
Gilles. -
I am trying to understand how good is DSP caching and what functionality does it exactly provide behind the scene.
It is very easy to check for exact repetition of a query in given time frame and returning older results from cache. I am wondering whether DSP does any of the advance stuff like following:
1. Are new queries compared against old queries in cache to check whether data retreived by new query will be a subset of data retrieved earlier? If it does so, it could just query the data it already has in cache and return result set.
2. If DSP does comparison as mentioned in 1, does it do comparisons individually with original queries in cache or with a unified version of all queries in its cache?DSP caches only exact function calls - same function, same parameters, same user. This can be a top-level function, or a function called within another function.
Enable DSP caching only if you have an exact case that will benefit. I would recommend to only cache slow webservices - nothing else unless you really know what you are doing. -
How many Read Only Cache Groups?
How many Read Only Cache Groups we can createin in one DSN?
I mean if e.g. 100 are possible?
Thanks
BR
Andrzej
Edited by: user8181100 on 2009-04-07 05:53As many as you like. There is no fixed upper limit.
Chris -
How can I configure Cache settings ? Frequency , capacity ?
How can I configure cache settings like capacity and frequency? System is very slow . We experience system degradation.
# type about:config in the browser's location bar, and then press Enter.
# If a warning displays, click I'll be careful, I promise!. -
How to flush the cache of a JCO repository ?
Does anybody now how to flush the cache of the JCO repositories of pools managed by Netweaver application server without restarting the JVM ?
The reason I'm asking is that, whenever a tables or structure changes on ABAP side (CRM, IS-U, R/3), even though we redeploy the J2EE applications, they do not see the new definitions, and we have to restart the JVMs.
This is particularily annoying in an "high availability" production environment such a ours.
We need a close to 24/7 up time, and putting down the JVM for even a few minutes is becoming a problem.
I'd like to be able to manually flush the repositories when needed.
For example, is it possible to write a small java application that could perform the flush on a single request ?
I did not try writing any code to do so yet, but I guess this snippet can do the work:
IRepository rCRM = JCO.createRepository("FLUSH_CRM", "java:comp/env/eis/pool_crm")
while (rCRM !=null)
String [] crmFuncts = rCRM.getCachedFunctionInterfaces()
String [] crmStructs = rCRM.getCachedStructureDefinitions()
for (int i=0; crmFuncts!=null && i<crmFuncts.lenght; i++)
rCRM.removeFunctionInterfaceFromCache(crmFuncts<i>);
for (int i=0; crmStructs!=null && i<crmStructs.lenght; i++)
rCRM.removeStructureDefinitionFromCache(crmStructs<i>);
rCRM = rCRM.getNextRepository();
Does it ?
Edited by: Croussette Yves on Jun 9, 2008 8:46 PM
Edited by: Croussette Yves on Jun 9, 2008 8:47 PMHi,
Please check these link:-
1.[https://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/3219]
2.https://www.sdn.sap.com/irj/scn/thread?messageID=601915
3.https://www.sdn.sap.com/irj/scn/thread?messageID=135202
Best Regards,
Atul Bhatia
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