TMF Management Programming Manual (H06.05+)

Commands and Responses
HP NonStop TMF Management Programming Manual—540140-002
5-39
ALTER BEGINTRANS
Tokens in Command Buffer
ZTMF-MAP-Alter-BeginTrans
is an extensible structured token that contains fields for specifying the attributes of
the BEGINTRANS object to be altered. Although this token is required, it can
contain all null values; only one occurrence is allowed. This token contains the
following fields:
ZTransCountThresh
specifies the lower and upper limits at which the number of active transactions
in the system automatically disables and reenables new transactions.
The first value is the lower limit. When the total number of concurrent
transactions falls below this value, new transactions are reenabled, if other
conditions needed for reenabling exist. This value must be at least 1 and less
than the second value. If this field is ZTMF-VAL-ResetWord or ZTMF-VAL-
ResetDblWord, the value is 1500.
The second value is the upper limit. When the total number of concurrent
transactions exceeds this value, new transactions are disabled. This value
must be greater than the first value; the maximum is 1073741824. If this field
is ZTMF-VAL-ResetWord or ZTMF-VAL-ResetDblWord, the value is 1600.
To prevent transaction processing from constantly switching back and forth
between the enabled and disabled states, a recommended approach is to
allow a large range (such as 100) between the two limits.
ZTmfLibMemThresh
specifies the lower and upper limits of the percentage of CPU memory
allocated to TMFLIB at which TMF automatically disables and reenables new
transactions.
The first value is the lower limit. When the percent of CPU memory allocated
to TMFLIB falls below this value, BEGINTRANSACTION is reenabled. This
value must be less than the second value. If this field is ZTMF-VAL-
ResetWord or ZTMF-VAL-ResetDblWord, the value is 85.
The second value is the upper limit. When the percent of CPU memory
allocated to TMFLIB exceeds this value, BEGINTRANSACTION is disabled.
This value must be greater than the first value. If this field is ZTMF-VAL-
ResetWord or ZTMF-VAL-ResetDblWord, the value is 90.
To prevent transaction processing from constantly switching back and forth
between the enabled and disabled states, a recommended approach is to
allow an adequate range between the values of the two limits.