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.


The following section is included to inform users about the potential risks, whether known or unknown, of using this tool. The two main categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.

pt-sift is a read-only tool. It should be very low-risk.

At the time of this release, we know of no bugs that could cause serious harm to users.

The authoritative source for updated information is always the online issue tracking system. Issues that affect this tool will be marked as such. You can see a list of such issues at the following URL:

See also “BUGS” for more information on filing bugs and getting help.


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:


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


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


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


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


Select the next timestamp as the active sample.


Select the previous timestamp as the active sample.


Quit the program.


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


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.


This tool does not have any command-line options.


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”.


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 developed by Percona for MySQL support and consulting. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and developed primarily by him and Daniel Nichter, both of whom are employed by Percona. Visit for more software developed by Percona.


pt-sift 2.1.10