ztta/roll_extension - Quota for Extended Memory per user context
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| Parameter : ztta/roll_extension |
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| Short description: Quota for extended memory |
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Description:
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| This values specifies the amount of memory in bytes that a user |
| context can allocate to extended memory. |
| The value refers to the amount of memory that an |
| external mode (=SAP window) allocates. |
| If the entered value is exceeded, memory is first allocated from |
| the roll area again, until this is full, and then heap memory is |
| allocated (see %%ztta/roll_area%% ). |
| |
| ( Data in the roll area is copied at context change. |
| When heap memory is allocated, the assignment of this work |
| to this user context is fixed, and it is no longer available for |
| other user contexts (PRIV mode).) |
| If you set the value too high, an individual user could cause a |
| bottleneck in the extended memory by increasing his user context. |
| Other smaller user contexts would therefore take work processes |
| into PRIV mode, before their permitted quota was exhausted. |
| |
| |
| Aim: -Minimize number of work processes in PRIV mode. |
| - Distribute extended memory fairly. |
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| Unit: Bytes |
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| Default : 250000000 (250 MB) (others) |
| 2000000000 (2GB) (Microsoft Windows NT) |
| Increase the quota, because there is sufficient |
| extended memory through dynamic extension. |
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Lower if extended memory is scarce and must be distributed more
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| Default value: 250000000 (250MB) |
| Lower if extended memory is scarce and must be distributed more |
| fairly. |
| |
| Windows NT: 2000000000 (2GB) = increase the quota. |
| The quota for a user context in the extended memory is |
| %%em/address_space_MB%% (reserved memory area for |
| extended memory in the work process) |
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ztta/roll_extension only takes effect if its value is lower than
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| Who is permitted to make changes: The customer |
| No manual maintenance required for Microsoft Windows NT |
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| |
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| Dependencies: |
| ---------------- |
| ztta/roll_extension only takes effect if its value is lower than |
| %%em/initial_size_MB%%. |
| Increasing the size of ztta/roll_first saves extended memory, but |
| leads to an increased load during the context switch. |
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Database dependencies: None
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| Operating system dependencies: See above |
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| Database dependencies: None |
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| Short Description : Quota for Extended Memory per user context
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| Applications Area : System
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| Parameter Type : 6
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| Changes allowed : X
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| Valid for Operating System : *
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| Dynamic switchable :
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| Same on all Servers :
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| Minimum : 20000000
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| Maximum : 2147483647
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