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18

Soft Reference Object Cache Recommendation

(Trying again. Last post, ~50 minutes to compose, failed, possibly due to an attachment upload size ... and use 1 MB for the ObjectDB Datastore page file cache with page file size of 64 KB. Here are relevant objectdb.conf settings: <size initial="64kb" resize="64kb" page="64kb" /> <processing cache
16

ObjectDB's Database Doctor Incorrect Error Report

. Have you set the database page size to 256KB? The maximum supported page size is 64KB ... there will be a clear limit of 64KB. Thank you for this report. To avoid this error use page size of 64KB ... could support the 256KB max page size? For my use case, this would make 4 less disk accesses in the Amazon AWS
16

Occasionally slow requests in load testing

another test today with large initial DB size, to avoid resizing. The initial size was set to 4.5GB ... -timeout="0" /> <url-history size="50" user="true" password="true" /> <log path="$objectdb/log ... ="90" /> <logger name="*" level="info" /> </general> <database> <size initial="4608mb
12

Is it possible to remove parent/child entities without refresh?

();   Assert.assertEquals(4, parentEntity.getChildren().size());   entityManager.refresh(parentEntity); // Reload new state from database   Assert.assertEquals(3, parentEntity.getChildren().size ... ");   entityManager.getTransaction().commit();   Assert.assertEquals(2, parentEntity.getChildren().size
4

Server out of memory exceptions

writer and single reader. The message size going into the queue is not large - around 4k at most. Each ... the problem. Basically I'm creating 2 server based queues, each with 5 writers and 1 reader. The msg size ... msg - so 24mb raw data size? (Let me know if I've got this wrong though!) The test dies
3

javax.persistence.AttributeOverride

="value.size", column=@Column(name="SQUARE_FEET ... PropertyInfo { Integer parcelNumber; Integer size; BigDecimal tax
0

setUnique(unique)

Method javax.jdo.Query void setUnique( boolean unique ) Specify that only the first result of the query should be returned, rather than a collection. The execute method will return null if the query result size is 0. Parameters: unique - if true, only one element is returned Since: JDO 2.0
0

javax.jdo.Query

, rather than a collection. The execute method will return null if the query result size is 0. Parameters: unique
0

FetchPlan.fetchSize

Annotation Element javax.jdo.annotations.FetchPlan int fetchSize The number of instances of multi-valued fields retrieved by queries. Returns: the fetch size Default value: 0 Since: JDO 2.1
0

javax.jdo.annotations.FetchPlan

. Returns: the fetch size Default value: 0 Since: JDO 2.1 int maxFetchDepth The depth of references

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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