DB_PRINTLOG

Section: BerkeleyDB Utilities (1)
Updated: 06 December 2016
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NAME

db_printlog - Dumps log files into a human-readable format

SYNOPSIS

db_printlog [-NrV] [-b start-LSN] [-e stop-LSN] [-h home] [-P password] [-D bytes]

DESCRIPTION

The db_printlog utility is a debugging utility that dumps Berkeley DB log files in a human-readable format.

OPTIONS

-b start-LSN: Display log records starting at log sequence number (LSN) start-LSN; start-LSN is specified as a file number, followed by a slash (/) character, followed by an offset number, with no intervening whitespace.
-D bytes: Specifies the maximum number of bytes to dump for each key/data item found in the specified database. This option is only valid when -da is also specified. This option overrides the value set for the "set_data_len" parameter in your DB_CONFIG file, if any.
-e stop-LSN: Stop displaying log records at log sequence number (LSN) stop-LSN; stop-LSN is specified as a file number, followed by a slash (/) character, followed by an offset number, with no intervening whitespace.
-h home: Specify a home directory for the database environment; by default, the current working directory is used.
-N: Do not acquire shared region mutexes while running. Other problems, such as potentially fatal errors in Berkeley DB, will be ignored as well. This option is intended only for debugging errors, and should not be used under any other circumstances.
-P password: Specify an environment password. Although Berkeley DB utilities overwrite password strings as soon as possible, be aware there may be a window of vulnerability on systems where unprivileged users can see command-line arguments or where utilities are not able to overwrite the memory containing the command-line arguments.
-r: Read the log files in reverse order.
-V: Write the library version number to the standard output, and exit.

The db_printlog utility uses a Berkeley DB environment (as described for the -h option, the environment variable DB_HOME, or because the utility was run in a directory containing a Berkeley DB environment). In order to avoid environment corruption when using a Berkeley DB environment, db_printlog should always be given the chance to detach from the environment and exit gracefully. To cause db_printlog to release all environment resources and exit cleanly, send it an interrupt signal (SIGINT).

EXIT STATUS

The db_printlog utility exits 0 on success, and >0 if an error occurs.

ENVIRONMENT

DB_HOME: If the -h option is not specified and the environment variable DB_HOME is set, it is used as the path of the database home, as described in DB_ENV->open.

NOTES

If the application(s) that use the environment make use of the DB_ENV->set_lg_dir method, then in order for this utility to run correctly, you need a DB_CONFIG file which sets the proper paths using the set_lg_dir configuration parameter.