SYSOPT2 parameter
Summary
- Default value
- 0
- Parameter type
- System
- Where set
- On User 0's parameter line or reset by system manager
- Related products
- All
- Introduced
- Model 204 V6.1 or earlier
Description
The valid settings of SYSOPT2 are (options can be summed):
| Hex setting | Decimal setting | Meaning |
|---|---|---|
| X'80' | 128 | Manages the XTIOT option. |
| X'40' | 64 | The record locking table is allocated above the bar and only 3-byte CCATEMP page numbers are used even if TEMPPAGE<65535.
This requires an increase in LRETBL. Rocket Software recommends an increase of 50 percent. |
This parameter applies to only z/OS.
SYSOPT2=X'80'
- With SYSOPT2 X'80' off, all dynamic allocations default to use the existing TIOT option unless the XTIOT option is specified on the DEFINE or ALLOCATE command.
- With SYSOPT2 X'80' on, all dynamic allocations that specify the OLD and DIRECT file options use the XTIOT option, unless the TIOT option is specified on the DEFINE or ALLOCATE command. To use this setting XMEMOPT=X'02' must also be set.
With the use of dynamic allocation and the XTIOT option, only the amount of processor storage limits the number of allocated data sets.
SYSOPT2=X'40'
Record sets-found sets, including FDWOL found sets, sorted sets, lists, and LPU lists-are traced through entries in the record locking table. One entry is required for each segment (49,152 records) in the record set. These entries are CCATEMP page numbers.
When SYSOPT2=X'40', the entries contain 4-byte CCATEMP page numbers. Setting SYSOPT2=X'40' provides a substantial increase in the number of simultaneous record sets that can be concurrently active in a given Model 204 run. Therefore, if you set SYSOPT2=X'40', you should also at least double LRETBL.
- When the SYSOPT2 setting does not include X'40', then at any given time the bit maps corresponding to all users holding found sets of any kind must fit into CCATEMP pages designated as the small model page pool no matter how large CCATEMP has been allocated.
- When the SYSOPT2 setting does include X'40', the CCATEMP page restriction is removed and user found sets can be placed anywhere within CCATEMP. This includes both the small model page pool and the CCATEMP expansion area, allowing for the possibility of a greater number of concurrent found sets being held by all users.