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21

JPA query of a Set of terms

? For example, suppose I have a table that maps a search terms to pages: @Entity public class SearchIndex { @Index SearchTerm term; @Index Page page; } Now suppose I have an array ... that are already persisted. em.createQuery(     "SELECT DISTINCT si.page FROM SearchIndex si
19

Soft Reference Object Cache Recommendation

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 ... datastore page file cache keeping strong references to the pages that comprise the data of the byte
18

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
8

Shared (L2) Entity Cache

on the client side - ObjectDB manages also several caches on the server side: Cache of database file pages
8

Literals in JPQL and Criteria Queries

explained in the Comparison Operators page. Boolean Literals Similarly to Java and SQL, JPQL supports
8

JPA Query Structure (JPQL / Criteria)

. Organization of this Section This section contains the following pages: Detailed explanations
8

JPA Reference (JavaDoc)

into the following sections: The purpose of these documentation pages is to serve as a reference. In
8

JPA Query Expressions (JPQL / Criteria)

This section contains the following pages: Detailed explanations on how to build criteria query
5

Unexpected exception (Error 990) on find

850977) [2] Unexpected total page count: 206592 (expected 206563) BTree Value Errors ... ) Page Relation Errors -------------------- [1] Page #96658 unexpected exception: null [2] Page #96658 last key is null, parent page #144908 next key is 'Elementarprodukt:400000100465140:7:1:' [3
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Step 3: Add a Context Listener Class

). The next step is adding a servlet class that will manage the guestbook page.

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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