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3211034 - Recommended value for parameter statement_memory_limit.

Symptom

You want to know the recommended value for statement_memory_limit which defines the maximum memory allocation per statement in GB. The default value is 0 (no limit).

  • In the global.ini file, expand the memorymanager section and locate the parameter. Set an integer value in GB between 0 (no limit) and the value of the global allocation limit. Values that are too small can block the system from performing critical tasks.

  • When the statement memory limit is reached, a dump file is created with 'compositelimit_oom' in the name. The statement is aborted, but otherwise the system is not affected. By default only one dump file is written every 24 hours. If a second limit hits in that interval, no dump file is written. The interval can be configured in the memorymanager section of the global.ini file using the oom_dump_time_delta parameter, which sets the minimum time difference (in seconds) between two dumps of the same kind (and the same process).

  • The value defined for this parameter can be overridden by the corresponding workload class property STATEMENT_MEMORY_LIMIT.

After setting this parameter, statements that exceed the limit you have set on a host are stopped by running out of memory.


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Environment

  • HANA 1.0 SPS8 or newer
  • HANA 2.0

Product

SAP HANA 1.0, platform edition ; SAP HANA, platform edition 2.0

Keywords

statement_memory_limit; GENERIC_COMPOSITE_LIMIT; , KBA , HAN-DB-PERF , SAP HANA Database Performance , Problem

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