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pt-sift - Browses files created by pt-stalk.




pt-sift browses files created by pt-stalk. If no options are given, the tool browses all pt-stalk files in /var/lib/pt-stalk if that directory exists, else the current working directory is used. If a FILE is given, the tool browses files with the same prefix in the given file’s directory. If a PREFIX is given, the tool browses files in /var/lib/pt-stalk (or the current working directory) with the same prefix. If a DIRECTORY is given, the tool browses all pt-stalk files in it.


Percona Toolkit is mature, proven in the real world, and well tested, but all database tools can pose a risk to the system and the database server. Before using this tool, please:

  • Read the tool’s documentation

  • Review the tool’s known “BUGS”

  • Test the tool on a non-production server

  • Backup your production server and verify the backups


pt-sift downloads other tools that it might need, such as pt-diskstats, and then makes a list of the unique timestamp prefixes of all the files in the directory, as written by the pt-stalk tool. If the user specified a timestamp on the command line, then it begins with that sample of data; otherwise it begins by showing a list of the timestamps and prompting for a selection. Thereafter, it displays a summary of the selected sample, and the user can navigate and inspect with keystrokes. The keystroke commands you can use are as follows:

  • d

Sets the action to start the pt-diskstats tool on the sample’s disk performance statistics.

  • i

Sets the action to view the first INNODB STATUS sample in less.

  • m

Displays the first 4 samples of SHOW STATUS counters side by side with the pt-mext tool.

  • n

Summarizes the first sample of netstat data in two ways: by originating host, and by connection state.

  • j

Select the next timestamp as the active sample.

  • k

Select the previous timestamp as the active sample.

  • q

Quit the program.

  • 1

Sets the action for each sample to the default, which is to view a summary of the sample.

  • 0

Sets the action to just list the files in the sample.

Sets the action to view all of the sample’s files in the less program.



Show help and exit.


Show version and exit.


This tool does not use any environment variables.


This tool requires Bash v3 and the following programs: pt-diskstats, pt-pmp, pt-mext, and pt-align. If these programs are not in your PATH, they will be fetched from the Internet if curl is available.


For a list of known bugs, see

Please report bugs at Include the following information in your bug report:

  • Complete command-line used to run the tool

  • Tool --version

  • MySQL version of all servers involved

  • Output from the tool including STDERR

  • Input files (log/dump/config files, etc.)

If possible, include debugging output by running the tool with PTDEBUG; see “ENVIRONMENT”.


Using <PTDEBUG> might expose passwords. When debug is enabled, all command line parameters are shown in the output.


Visit to download the latest release of Percona Toolkit. Or, get the latest release from the command line:




You can also get individual tools from the latest release:


Replace TOOL with the name of any tool.


Baron Schwartz


This tool is part of Percona Toolkit, a collection of advanced command-line tools for MySQL developed by Percona. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and primarily developed by him and Daniel Nichter. Visit to learn about other free, open-source software from Percona.


pt-sift 3.5.7