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Database Explorer

, when the Explorer starts it tries to open a connection to the most recently used database ... when the Explorer starts. The [Table (instead of Tree) as a default viewer window] check box specifies

FROM clause (JPQL / Criteria API)

have any matching inner value it gets at least a NULL value as a matching value in the FROM

WHERE clause (JPQL / Criteria API)

objects to the SELECT clause for collecting as query results, the WHERE clause gets an opportunity

JPA Primary Key

values. Obtaining the Primary Key JPA 2 provides a generic method for getting the object ID (primary

Online Backup degrades responsiveness.

, this only started happening these 2 days, and only when the server is busy, e.g. the DB is getting hit harder ... days: try { CoreService.getLogger(this).info("DB Backup Start ... would start to have issues responding during the end of the backup process. e.g. The Backup usually takes

Best practise loading big data

access. If all of them potentially hold this amount of memory then our application gets into trouble ... .000 MyValue objects I open the DB connection, create an entitiy manager and start to read the first ... enhancement speeds up the application. At start of reading, the DB can deliver about 1000 values

Pessimistic lock timeout - blocks indefinitely

with a timeout (albeit much less efficient!). However, this is the output I get: Starting... updater3 starting updater4 starting updater0 starting updater2 starting updater1 starting updater1 ... changing name from start to updater4 updater4 commited updater0 LockTimeoutException updater2 changing

JPA Lifecycle Events

follows the definition order. Internal callback methods are invoked starting at the top level entity class

Database Management Settings

as the background index activation is completed, ObjectDB can start using the new indexes

[ODB1] Chapter 5 - JDO Connections

transactions. A transaction is started by a call to begin() and ended by a call to commit() or rollback ... are applied to the database is not acceptable. Before commit() starts writing to the database it stores

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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