HP Integrity NonStop J-Series User Manual
Page 104
NonStop AutoTMF Commands
HP NonStop AutoTMF Software User’s Guide—429952-017
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ALTER ATMFPROGRAMS
WEAK isolation commits outstanding transactions whenever a process
replies to a request or waits for a new request. This is the default.
NORMAL isolation commits outstanding transactions whenever a process
sends a request to another process.
STRONG isolation commits outstanding transactions whenever the
process does one of the following:
issues a READ or a WRITE to a device,
issues a WRITE to a non-audited disk file
ISOLATION overrides the value of the global parameter ATMFISOLATION.
MAXTIME 1-to-n-seconds | NO MAXTIME
commits automatic transactions after n seconds, if the process is not holding
locks on any of the participating records. This is an advisory setting for
performance, not one that precisely controls management of automatic
transactions.
The value of n should be a power of 2 (1,2,4,8,16,32,...) in the range of 1 to
4096. If the value specified is not a power of 2, the value will be rounded to a
power of 2.
The default is 16 seconds.
MAXTX 1-to-1000 | NO MAXTX
the maximum number of concurrent transactions a program can process.
MAXTX is rounded up to the next multiple of 100 when AutoTMF opens the
TFILE ($TMP).
The default is 100.
If an application program opens the TFILE with a transaction depth greater
than 100, AutoTMF also increases its current value of MAXTX to the value
specified by the program, rounded up to the next multiple of 100.
An application program must open the TFILE before AutoTMF opens the
TFILE in order to have the maximum depth increased under program control.
Once AutoTMF has opened the TFILE, AutoTMF cannot close and reopen
TFILE with the desired depth. In such cases, you must configure MAXTX
specifically if a value larger than 100 is desired.
MAXTX overrides the value set with the global parameter ATMFMAXTX.
MAXUPDATES 1-to-n | NO MAXUPDATES
commits automatic transactions after n updates and inserts, but only if the
process is not holding locks on any of the participating records. This is an
Note. You can set MAXTX to a value greater than 100 only on NonStop servers that
support a maximum of 1000 transactions (T9055AER and later)