XML backups cause performance problems or 'java.lang.OutOfMemoryError Java heap space'

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Atlassian recommends disabling the XML backup both for performance and reliability. Setting up a test server and the Production Backup Strategy is better done with an SQL dump. Upgrading Confluence is better done without the XML backup.

The one operation for which an XML backup is required is database migration. For this we recommend a commercial database migration tool. Vote for XML backups cause performance problems or 'java.lang.OutOfMemoryError Java heap space' to add a more robust strategy for large implementation migrations. Atlassian does not support migrating to a new database.


  1. The system performs slowly or crashes.
  2. Other unpredictable outcomes can include failed mail or index rebuilding (including searching or Recently Updated problems).
  3. Daily XML backups fail to be created

The following appears in the atlassian-confluence.log:

Caused by: java.lang.OutOfMemoryError: Java heap space
at org.postgresql.util.PGbytea.toBytes(PGbytea.java:53)
at org.postgresql.jdbc2.AbstractJdbc2ResultSet.getBytes(AbstractJdbc2ResultSet.java:2271)
at org.postgresql.jdbc2.AbstractJdbc2ResultSet.getBinaryStream(AbstractJdbc2ResultSet.java:2386)
at com.mchange.v2.c3p0.impl.NewProxyResultSet.getBinaryStream(NewProxyResultSet.java:519)
at org.springframework.jdbc.support.lob.DefaultLobHandler.getBlobAsBinaryStream(DefaultLobHandler.java:64)
at org.springframework.orm.hibernate.support.BlobInputStreamType.nullSafeGetInternal(BlobInputStreamType.java:24)
at org.springframework.orm.hibernate.support.SpoolingBlobInputStreamType.nullSafeGetInternal(SpoolingBlobInputStreamType.java:45)
at org.springframework.orm.hibernate.support.AbstractLobType.nullSafeGet(AbstractLobType.java:137)
at net.sf.hibernate.type.CustomType.nullSafeGet(CustomType.java:92)


Confluence xml backups are not recommended for production installations. The XML backup performs poorly under load and require large amounts of memory and thus do not scale.
We have included a warning in the Administration Screen:


Disable the XML backup from Administration >> Daily Backup Admin. Use the Production Backup Strategy instead, (your DBA and system admin is probably doing this already).

Last modified on Mar 30, 2016

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