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25

Performance issues on aggregate query

; public Date associatedFileLastModification; @Index public String classIdentifier; public Date created ... ; @Index public String fileURL; @Index public String foreignUuid; @Index public String identCode; public String internalReference; // EUR-0004 public Boolean inSlots = true; @Index public Date
25

Queries are slow on a large database

needs 4 to 5 minutes to return a result. I have been adviced to use indexes ... :     <class name="MessageImpl"> <extension vendor-name="objectdb" key="unique-index" value="Id"/> <extension vendor-name="objectdb" key="index" value="logTestRunId
21

What role is the JDO in ObjectDB?

in JPA that the @Index can not be used. These is an example in ObjectDB which used @Index, I traced it to the JDO lib. So if I want to make a index without SQL on database, then @Index is a mandatory function. Any suggestion on @Index? gzdillon Lai Yang You are right - setting indexes is currently
21

Exception after update of indices of Entity class

Hello, I changed the index definition of an entity class from @Index()... to @Indices() and now I ... it is not the most recent build. Could you please try opening the database after the index change ... . Changing from @Index()... to @Indices() should not change anything if it is only annotation change
20

alter table

... alter table add index ... TIA gzdillon Lai Yang There are no tables is ObjectDB ... the manual). > alter table add index ... Add the index definition and rebuild the database using ... column"; but I can not find anything about "add index" in the links you given. TIA gzdillon Lai Yang
4

each 1-2 days objects on some objectdb level lock/block each other

" /> <processing cache="4096mb" max-threads="80" /> <index-update enabled="true" priority ... using additional indexes, to prevent the need for repeating requests. support Support It also makes ... ) but with the heavy running threads, which run massive queries against the data rather than against the indexes
0

javax.jdo.annotations.Discriminator

: "" Since: JDO 2.1 String indexed Whether the discriminator is indexed. Whether the discriminator is indexed. Returns: whether the discriminator is indexed Default value: "" Since: JDO 2.1
0

setRange(fromIncl, toExcl)

is done at the data store. Parameters: fromIncl - 0-based inclusive start index toExcl - 0-based exclusive end index, or Long.MAX_VALUE for no limit. Since: JDO 2.0
0

javax.jdo.Query

-based inclusive start index toExcl - 0-based exclusive end index, or Long.MAX_VALUE for no limit
0

javax.jdo.annotations.Indices

javax.jdo.annotations Annotation Indices Target: Classes Annotation for a group of index constraints. Since: JDO 2.1 Index[] value The indices The indices Returns: The indices Since: JDO 2.1

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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