pg_xlogdumppg_xlogdump1Applicationpg_xlogdumpDisplay a human-readable rendering of the write-ahead log of a PostgreSQL database clusterpg_xlogdumpDescriptionpg_xlogdump displays the write-ahead log (WAL) and is mainly
useful for debugging or educational purposes.
This utility can only be run by the user who installed the server, because
it requires read-only access to the data directory.
Options
The following command-line options control the location and format of the
output:
startseg
Start reading at the specified log segment file. This implicitly determines
the path in which files will be searched for, and the timeline to use.
endseg
Stop after reading the specified log segment file.
Output detailed information about backup blocks.
Stop reading at the specified log position, instead of reading to the
end of the log stream.
After reaching the end of valid WAL, keep polling once per second for
new WAL to appear.
Display the specified number of records, then stop.
Directory in which to find log segment files. The default is to search
for them in the pg_xlog subdirectory of the current
directory.
Only display records generated by the specified resource manager.
If list is passed as name, print a list of valid resource manager
names, and exit.
Log position at which to start reading. The default is to start reading
the first valid log record found in the earliest file found.
Timeline from which to read log records. The default is to use the
value in startseg, if that is specified; otherwise, the
default is 1.
Print the pg_xlogdump version and exit.
Only display records marked with the given TransactionId.
Show help about pg_xlogdump command line
arguments, and exit.
Notes
Can give wrong results when the server is running.
Only the specified timeline is displayed (or the default, if none is
specified). Records in other timelines are ignored.
See Also