As an in-memory database, it is particularly critical for SAP HANA to carefully manage and track its consumption of memory. For this purpose, SAP HANA manages its own data memory pool by requesting memory from the OS, possibly in advance of using it. The memory pool is used to store all the in-memory data and system tables, thread stacks, temporary computations and all the other data structures required for managing a database.
SAP HANA tracks memory from the perspective of the host. The most important concepts are as follows:
Physical memory:
The amount of (system) physical memory available on the host.
SAP HANA Allocated memory:
The memory pool reserved by SAP HANA from the operating system.
SAP HANA Used memory:
SAP refers to the total amount of memory actually in use as the SAP HANA Used Memory.
For even more details, check out the new Memory Overview feature of the SAP HANA studio. To access it, right click on a system in the Systems View, and select "Open Memory Overview" in the context menu, as follows:
SAP HANA tracks memory from the perspective of the host. The most important concepts are as follows:
Physical memory:
The amount of (system) physical memory available on the host.
SAP HANA Allocated memory:
The memory pool reserved by SAP HANA from the operating system.
SAP HANA Used memory:
SAP refers to the total amount of memory actually in use as the SAP HANA Used Memory.
SAP HANA Studio:
You can view some of the most important memory indicators on the Overview tab of the SAP HANA studio administrative perspective:
For even more details, check out the new Memory Overview feature of the SAP HANA studio. To access it, right click on a system in the Systems View, and select "Open Memory Overview" in the context menu, as follows:
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