Provided by: postgresql-11_11.5-1_amd64 bug


       pg_waldump - display a human-readable rendering of the write-ahead log of a PostgreSQL
       database cluster


       pg_waldump [option...] [startseg [endseg]]


       pg_waldump 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.


       The following command-line options control the location and format of the output:

           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.

           Stop after reading the specified log segment file.

           Output detailed information about backup blocks.

       -e end
           Stop reading at the specified WAL location, instead of reading to the end of the log

           After reaching the end of valid WAL, keep polling once per second for new WAL to

       -n limit
           Display the specified number of records, then stop.

       -p path
           Specifies a directory to search for log segment files or a directory with a pg_wal
           subdirectory that contains such files. The default is to search in the current
           directory, the pg_wal subdirectory of the current directory, and the pg_wal
           subdirectory of PGDATA.

       -r rmgr
           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.

       -s start
           WAL location at which to start reading. The default is to start reading the first
           valid log record found in the earliest file found.

       -t timeline
           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_waldump version and exit.

       -x xid
           Only display records marked with the given transaction ID.

           Display summary statistics (number and size of records and full-page images) instead
           of individual records. Optionally generate statistics per-record instead of per-rmgr.

           Show help about pg_waldump command line arguments, and exit.


       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.

       pg_waldump cannot read WAL files with suffix .partial. If those files need to be read,
       .partial suffix needs to be removed from the file name.


       Section 30.5