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If you were logged in you would be able to see more operations.
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db4o Core
Created: 31/Oct/08 03:37 PM
Updated: 03/Mar/09 03:19 PM
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| Component/s: |
Queries
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| Affects Version/s: |
7.4.55
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| Fix Version/s: |
7.8.84
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Environment:
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7.4.58, but it's not listed. Java. Debian lenny/sid.
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Issue Links:
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Resulted
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This issue resulted in:
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COR-1559
Defragment breaks null field index entries
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Our class:
PersistentBlobTempBucketTag {
...
PersistentBlobTempBucket bucket
}
Set up indexes:
...
dbConfig.objectClass(freenet.support.io.PersistentBlobTempBucketTag.class).objectField("bucket").indexed(true);
Do the query :
Query query = container.query();
query.constrain(PersistentBlobTempBucketTag.class);
query.descend("bucket").constrain(null).identity();
(Setting and() with the subconstraint doesn't change anything, identity() makes it OOM a bit later).
As you can see, the query is executed by instantiating every object:
28070016 219297 com.db4o.internal.query.processor.QCandidate
22075352 212263 com.db4o.internal.ObjectReference
12734656 198979 freenet.support.io.PersistentBlobTempBucket
11886840 212265 com.db4o.internal.ActiveObjectReference
Eventually this causes an OutOfMemoryException, as well as being a major performance cost.
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Description
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Our class:
PersistentBlobTempBucketTag {
...
PersistentBlobTempBucket bucket
}
Set up indexes:
...
dbConfig.objectClass(freenet.support.io.PersistentBlobTempBucketTag.class).objectField("bucket").indexed(true);
Do the query :
Query query = container.query();
query.constrain(PersistentBlobTempBucketTag.class);
query.descend("bucket").constrain(null).identity();
(Setting and() with the subconstraint doesn't change anything, identity() makes it OOM a bit later).
As you can see, the query is executed by instantiating every object:
28070016 219297 com.db4o.internal.query.processor.QCandidate
22075352 212263 com.db4o.internal.ObjectReference
12734656 198979 freenet.support.io.PersistentBlobTempBucket
11886840 212265 com.db4o.internal.ActiveObjectReference
Eventually this causes an OutOfMemoryException, as well as being a major performance cost. |
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Bug
