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97

Index on a low cardinality column

" If many of the values in the field are the same, the index might not significantly speed up queries." "An index on the gender column likely would not help because there's no value in an index on a low cardinality column. Meaning, there's not enough variety in the values for the index to provide
95

Index causes increased memory usage

up that memory? The data load was the same for both tests (with and without String indexing ... on the server? Thanks, CVTSC cvtsc Dev Team Using indexes should not make that difference. When indexes ... was the including the indexes. How are the indexes stored? Is it simply a pointer to the field
95

Multi part paths in a composite index must have the same length

Hi, I am trying to create some index in a DB - but I get an exception when i try to commit. Exception in thread "main" [ObjectDB 2.6.0_01] javax.persistence.PersistenceException Invalid index path ... .createQuery(EMImpl.java:958) Here is how the class of the persisted object looks like @Entity @Index
94

Date field Index is corrupted due to time change

several BTrees (apparently BTrees that contain time based indexed data). It is unclear yet how exactly this happened. support Support Apparently we found the bug, which affects indexes on pure Date ... , but the index will become corrupted only if the date is written in different levels of the BTree
94

Adding multi part path index on non-embedable object member

Is there a way to add single member index on members of a object member which is not configured ... } So I wanted to add index on Customer for merchant.name or on stores.name given those merchant and Store class has the corresponding fields. e.g. @Entity @Indices({ @Index(members={"merchant
93

index - data rewrite

Hi we have found that applying indexes on an existing table erases the data. Are we doing ... defined indexes. In earlier versions new indexes had no effect until the database was rebuilt using the Doctor. What ObjectDB version are you using? Because automatic activation of new indexes is a new
92

Index on map key

Is there a way to create an Index with @Index on the key of a map? wua Andreas Wurm Indexes on map ... .*; import javax.jdo.annotations.Index; import javax.persistence.*; public class T1255 ... ();     }     @Entity     @Index(members={"map.key"})     public static class MyEntity {         MyEntity(Collection
92

New Index causing troubles

Hello, we introduced a new index upon a String field Order.typeName, added to package.jdo as ... > <extension vendor-name="objectdb" key="index" value="storeOid"/> <extension vendor-name="objectdb" key="index" value="orderDateEpochDay"/> <extension vendor-name="objectdb" key
18

Indexes broken after schema update

an existing one and I get 0 results when trying to query by an existing index(that still exists) and the below errors in the logs. I can query the object fine by non-indexed fields and by the @Id. [2012-08-19 19:42:25 #74 store] *** Attempt to remove a non existing index entry: [2012-08-19 19:42:25 #75
1

[ODB1] Chapter 9 - ObjectDB Explorer

the "Class" tabbed window and selecting "Rebuild Class Extent". The "Rebuild All Indexes" command starts a thread that scans the entire database and rebuilds all the indexes. This tool is useful when adding a new index (in the JDO metadata) to a class that already has persistent instances in the database

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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