Details
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Bug
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Resolution: Fixed
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Medium
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5.7.5, 5.10.8, 6.6.1, 6.13.4, 6.13.10, 7.3.1, 7.4.1, 7.4.3
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49
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Severity 3 - Minor
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30
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Description
Summary
Exporting selected pages of a relatively large space to XML will failed and the error message: "Couldn't backup database data" is shown in the UI
Environment
- Oracle 11g
- Oracle 12
- SQL Server
- Microsoft SQL Server
Steps to Reproduce
- Have Confluence connected to Oracle 11g
- Have a relatively large space (with 1000+ deleted pages in Oracle)
- Go to Space Tools > Content Tools > Export > XML
- Custom Export > Choose few pages
- Export
Expected Results
Export was successful
Actual Results
Export was not successful
2015-12-08 14:36:48,837 ERROR [Long running task: Export Space] [confluence.importexport.impl.AbstractXmlExporter] backupEntities Couldn't backup database data. -- referer: https://www-test.wiki.ed.ac.uk/spaces/exportspacexml.action?key=GenePool | url: /spaces/doexportspace.action | userName: aforres3 | action: doexportspace org.springframework.jdbc.BadSqlGrammarException: Hibernate operation: Could not execute query; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: ORA-01795: maximum number of expressions in a list is 1000 ... Caused by: java.sql.SQLSyntaxErrorException: ORA-01795: maximum number of expressions in a list is 1000 ...
This has also been observed with SQL Server:
2018-10-22 23:08:42,036 WARN [Long running task: Export Space] [hibernate.query.internal.QueryParameterBindingsImpl] expandListValuedParameters HHH000443: Dialect [com.atlassian.confluence.impl.hibernate.dialect.SQLServerDialect] limits the number of elements in an IN predicate to 2100 entries. However, the given parameter list [exclusions] contained 20701 entries, which will likely cause failures to execute the query in the database
For the Confluence running on the MSSQL server, the error message in the logs is this one:
2020-05-26 17:44:23,744 ERROR [Long running task: Export Space] [engine.jdbc.spi.SqlExceptionHelper] logExceptions The incoming request has too many parameters. The server supports a maximum of 2100 parameters. Reduce the number of parameters and resend the request. – url: /spaces/doexportspace.action | referer: [https://xxxxxxxxxxxxxxxx:spaces/exportspacexml.action?key=SPACE] | traceId: 116358ab22940a24 | userName: xxxxxxx | action: doexportspace 2020-05-26 17:44:23,745 ERROR [Long running task: Export Space] [confluence.importexport.impl.AbstractXmlExporter] backupEntities Couldn't backup database data. – url: /spaces/doexportspace.action | referer: [https://xxxxxxxxx/spaces/exportspacexml.action?key=SPAPCE] | traceId: 116358ab22940a24 | userName: XXXXXXXX | action: doexportspace org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet at org.springframework.orm.hibernate5.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:224) at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:368) at org.springframework.orm.hibernate5.HibernateTemplate.execute(HibernateTemplate.java:315) ... at java.lang.Thread.run(Thread.java:748) Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet .... Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The incoming request has too many parameters. The server supports a maximum of 2100 parameters. Reduce the number of parameters and resend the request.
Notes
This is caused by some methods in confluence that returns more than 1000 entities/object. Oracle has a limitation of maximum acceptable number of entities in a list to be 1000
On the MSSQL there is a hard-coded limit (2100) for the number of entries in the IN statement:
https://github.com/Microsoft/msphpsql/blob/v4.2.0-preview/source/shared/core_sqlsrv.h#L172
https://github.com/microsoft/msphpsql/issues/410
Workaround
Exporting the whole space to XML works alright. As such, by copying the pages to a new (empty) Space, and exporting the entire new Space, the pages should be exported successfully.
Attachments
Issue Links
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