NetBase for MPE Reference Guide

Chapter 3
3-22
SHADOW - Enable Export Logging
This flag enables the transaction logging feature of shadowing. When enabled, all shadow
transactions will be logged to a series of files in the LOG group. These files can be used for roll
forward recovery on any subset of the shadowed files. This parameter takes effect when the START
EXPORT command is issued in NBCTRL.
Default = N
SHADOW - Export Log File Size
Determines the size of the shadow log files, in blocks. Each log file block is 64 sectors and can hold
as many as 100 shadow transactions. When a log file fills up, a new log file will be created
automatically. This parameter takes effect when the START EXPORT command is issued in NBCTRL.
Default = 0
Maximum = 2,147,483,647
SHADOW - Export Log File Timeout
This parameter determines how often to flush a log file’s buffers to disc. This will protect a log file
from system crashes. The value for this parameter is the number of transactions that will be added
to the log file between flushes. The log file is also flushed to disc when the inactivity timer expires.
This parameter takes effect when the START EXPORT command is issued in NBCTRL.
Default = 100
SHADOW-Queue Full Warn Time-out
This parameter enables a timer that causes warning messages to display on the system console if the
shadow queue file (NBM) fills up. These messages will alert the system operator to correct the
problem. Each user process that encounters this condition will emit one message. This parameter
takes effect when new user processes are created.
Default = 180