How to get a heapdump which can by analyzed with MAT

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Symptom
Support requested a heapdump to analyze a high memory consumption.
Other terms
OOM, memory leak
Reason and Prerequisites
You need the IBM JVM 1.4.2 64Bit SR12 for AIX or above.
Solution
1. If you are running with the IBM Hybrid JVM 1.4.2 with J9 technology (SAP note 1024539, 1008311) SR12 or above you have to add the following parameter to [...]

Configuring Maximum Message Size Limits for OOM Error

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Symptom
You notice that the J2EE Engine restarts frequently, due to an Out Of Memory Error(OOM) (i.e., “java.lang.OutOfMemoryError” ). Traces and thread dumps will exhibit, the following error message: “java.lang.OutOfMemoryError. The JVM(Java Virtual Machine) will exit with an exit code of 666″
Other terms
JDBC, JDBC Adapter, OutOfMemoryError, OOM , Message Size Limit, Limit Number of [...]

DB2-z/OS:Creating a heapdump which can be analyzed with MAT

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Symptom
SAP Support requested a heapdump to analyze a high memory consumption
Other terms
OOM, memory leak, OutOfMemory, J2EE, DB2-z/OS, Eclipse, Memory Tool, SAP
Reason and Prerequisites
You need the IBM JVM 1.4.2 64bit SR13 for zLinux or above
Solution
1. If you are running with the IBM Hybrid JVM 1.4.2 with J9 technology (SAP Note 1319038) SR13 or above, you [...]

Recommended Settings for NW04 >= SP14, NW 7.0 >= SP6 on AIX

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Symptom
Recommended Settings for the IBM 1.4.2 JVM (J9) for upgrading SAP NetWeaver 2004 SP14 and above or NetWeaver 7.0 (2004s) SP6 and above on AIX.
Other terms
Java Virtual Machine, JDK, SDK, J9, XI, Enterprise Portal, OOM
Reason and Prerequisites
For SAP NetWeaver 2004 SP14 or above or NetWeaver 7.0 (2004s) SP6 and above the new IBM [...]