Oracle TimesTen In-Memory Database API and SQL Reference Guide

Access
Control
LogPurge
If the LogPurge attribute is set, TimesTen automatically removes log files when
they have been written to both checkpoint files and there are no transactions that
still need the log files' contents. The first time checkpoint is called, the contents
of the log files are written to one of the checkpoint files. When checkpoint is
called the second time, TimesTen writes the contents of the log files to both
checkpoint files.
TimesTen purges the log files if all of these conditions are met:
• The contents of the log files have been written to both checkpoint files,
• The log files are not pending incremental backup,
• If replication is being used, the log files have been replicated to all
subscribers,
• If XLA is being used, all XLA bookmarks have advanced beyond the log files.
• The log files are not being used by any distributed transactions using the XA
interface.
If this attribute is not set, unneeded log files are appended with the.arch suffix.
Applications can then delete the files.
This attribute is relevant only if Logging is set to 1. See also MatchLogOpts
(page 53).
If Access Control is enabled, this attribute requires ADMIN privileges.
Setting Set LogPurge as follows:
C or Java
programs
or UNIX
ODBC.INI file
Windows
ODBC Data
Source
Administrator
LogPurge 0—Does not remove old log files at
connect and checkpoint.
1—Removes old log files at connect
and checkpoint (default).
LogPurge
check box
unchecked—Does not remove old log
files at connect and checkpoint.
checked—Removes old log files at
connect and checkpoint (default).
38 Oracle TimesTen In-Memory Database API and SQL Reference Guide