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database optimization

Hi, couple of questions regarding database optimization: 1) Noticed ... slower than read queries, on the same set of objects.     objects in memory for longer

Benchmark native JPA of Versant database (without datanucleous)

Now Versant DB (db4o commercial) has JPA implementation    Can you benchmark this Object Oriented DB to compare with Object DB? joseaio Jose A. Illescas Since the Versant Object Database (unlike db4o) is not open source it would be impossible

World database - Changing country ID

of an existing entity object is not allowed and the Explorer should be fixed to prevent it. If you have to change the primary key you should create a new entity object with the new primary key and delete the old entity object (and of course, update relevant references). Regarding

Database is locked when in use

and paste the odb files in the file system but the same i was able to do it in object db 1.0. binitbhaskar Binit Bhaskar Using copy & paste to clone a database when it is in active use ... class="code">EntityManager. In ObjectDB the same object is an instance

Many clients access same database

Hi, I have a program to manage clients of my tennis club. But we have several different computer programs open that access the database. How can I implement this topology ... objects to get their up to date content. support Support

Does JPA have any configuration to create DDL's that are database specific

configuration to create DDL's that are database specific.   miteshpoo ... annotation. But this is relevant only for ORM (Object Relational Mapping) JPA and ignored by ObjectDB. support Support

Index Definition

Querying without indexes requires iteration over entity objects in the database one by one. This may take a significant amount of time if many entity objects have to be examined. Using proper indexes the iteration can be avoided and complex queries over millions of objects

Auto Generated Values

for every new entity object. These generated values are unique at the database level and are never recycled, as ... maintains a special global number generator for every database. This number generator is used to generate automatic object IDs for entity objects with no primary key fields defined (as explained in

Step 4: Add a Servlet Class

is constructed and stored in the database. All the Guest entity objects are retrieved ... a database connection: EntityManagerFactory emf = (EntityManagerFactory ... ") .forward(request, response); } finally { // Close the database connection

Step 4: Add a Servlet Class

is constructed and stored in the database. All the Guest entity objects are retrieved ... a database connection: EntityManagerFactory emf = (EntityManagerFactory ... ") .forward(request, response); } finally { // Close the database connection