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66

database optimization

Hi, couple of questions regarding database optimization: 1) Noticed something odd with the level 2 cache configuration: level2="0mb" -> 20 msec query level2="2mb" -> 10 msec level2="10mb" -> 40 msec Question: why is a larger level2 cache worse than no level2 cache, ie 10mb worse than 0mb? 2
66

Feature request - ability to refresh an open database view in explorer

The ability to refresh view in explorer automatically. Fine if this is read-only. Extra points if you can do this with local databases as well as remote. dmoshal David Moshal ie: "Real-time" auto refreshing explorer views. dmoshal David Moshal alternatively, clicking on a class name gets the latest
66

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 so that there is one Persistence context for all the client programs on the different computers. For example: When I change
66

Cache configuration of database file pages, query programs, query results

Are there some possibilities to configure following caches in order to keep cache data for only some important entity types and for the entire life cycle of the EntityManagerFactory. Cache of database file pages. Cache of query programs. Cache of query execution results. btc_es BTC EmbeddedSystems
66

config file for embedded database

Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the improvements to the explorer - still need a way to view (view only) an open embedded database. dmoshal David Moshal The same procedure
66

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 to include it in the JPAB benchmark results
66

Access to client/server database from multiple applications

Is there a preferred way to run a client-server database so that updates from one application are immediately visible to another? The way I managed this was to run PersistenceManagerFactory.getDataStoreCache().evictAll(true,MyClass.class) to ensure that a query on MyClass would contain updated data
66

World database - Changing country ID

the primary key in the world example database - the data is derived from the CIA Factbook, in
13

config file for embedded database

Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the improvements to the explorer - still need a way to view (view only) an open embedded database. dmoshal David Moshal Please read and follow
13

Explorer Features - refresh + viewing open embedded database

Request for feature: Ability to auto-refresh an explorer view, say at regular intervals of a few seconds. (at a minimum one ought to be able to manually refresh, for example the list of persistent types). additionally, it would be useful to be able to view an embedded database (read only mode) via the explorer. dmoshal David Moshal

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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