About composite

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2

possible index required for improving query performance

that a composite index can be used as a single index of the first element (with a small penalty compared ... a composite index makes a difference. Hi, I've been actually dealing with this, so it would be best ... objectdb select which index to use when there are multiple indexes? In this scenario we have a composite
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2

Queries are slow on a large database

. For diagnosis please try the same query without the ORDER BY clause. A composite index in ... will try composite index later. However there is one thing I haven't managed to figure ... the same directory as the database file is not sufficient. In addition, consider using composite
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2

Broken @ManyToOne reference

is only part of the primary key now. Hi support,   just tried the fixed version. Two notes: 1. For a composite key ... class to represent composite primary keys in a portable JPA way. Apparently implementing that Hibernate ... ).hasSingleIdAttribute()); prints true, which is not the case since the Child class ID is a composite.   Regards
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2

com.objectdb.o.NLV cannot be cast to com.objectdb.o.CMV

(EventDispatchThread.java:91) It seems that the query is executed using a composite index on the mapFromCli field. Could you please provide details on composite indexes that include that field? Unexpectedly ... ) it will probably help understanding the exact cause. The mapFormCli filed is a member of a number of composite
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2

Efficient query on EmbeddedId

.field1 and entity.id.field2 form a composite index together, in the order in ... of defining a composite index on ordinary non ID fields (although not exactly the same). You can not use ... may be slower than a query on the second field (non ID) in an ordinary composite index, since a full scan
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2

java.lang.NullPointerException when using ORDER BY

. using the composite index with the unexpected entry, so both issues may be solved together. I am not ... :9085' AND r.callDirection == 0)) Both mapToCli and callDirection are part of composite indices ... index while startDate, callDirection and mapToCli are members of (different) composite indices
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2

More Efficient Primary Keys

. We already need the key before the entities are persisted so that we can build even references. a) Composite ... it is a composite primary key with the same size and structure. (b) requires instantiation ... if allocated sequentially rather than randomly). It is unclear if a composite of two longs
Issue
2

Sort of very large objects - out of memory

processing mechanism in sorting very large objects. This requires a fix, but meanwhile, adding a composite ... pick the first or last entry in the composite index (instead of scanning the entire index). Composite
Result
2

ObjectDB version 2.3.1

). Fixed a ClassCastException in using a composite index in queries (issue #521). Fixed handling derived Id fields in composite PK embedded IDs. Fixed default ObjectDB home path ($objectdb) in NetBeans
Issue
2

Automatic Switch to Replicated Server Limitations

ObjectDB supports master-slave replication, with the ability to switch connections automatically to another server when a server goes down, by specifying a composite url. Currently this feature has the following limitations: The first server in the composite url has to be available when connecting