DBI::ProfileData

NAME

DBI::ProfileData - manipulate DBI::ProfileDumper data dumps

SYNOPSIS

The easiest way to use this module is through the dbiprof frontend (see dbiprof for details):

  dbiprof --number 15 --sort count

This module can also be used to roll your own profile analysis:

  # load data from dbi.prof
  $prof = DBI::ProfileData->new(File => "dbi.prof");

  # get a count of the records in the data set
  $count = $prof->count();

  # sort by longest overall time
  $prof->sort(field => "longest");

  # sort by longest overall time, least to greatest
  $prof->sort(field => "longest", reverse => 1);

  # exclude records with key2 eq 'disconnect'
  $prof->exclude(key2 => 'disconnect');

  # exclude records with key1 matching /^UPDATE/i
  $prof->exclude(key1 => qr/^UPDATE/i);

  # remove all records except those where key1 matches /^SELECT/i
  $prof->match(key1 => qr/^SELECT/i);

  # produce a formatted report with the given number of items
  $report = $prof->report(number => 10);

  # clone the profile data set
  $clone = $prof->clone();

  # get access to hash of header values
  $header = $prof->header();

  # get access to sorted array of nodes
  $nodes = $prof->nodes();

  # format a single node in the same style as report()
  $text = $prof->format($nodes->[0]);

  # get access to Data hash in DBI::Profile format
  $Data = $prof->Data();

DESCRIPTION

This module offers the ability to read, manipulate and format DBI::ProfileDumper profile data.

Conceptually, a profile consists of a series of records, or nodes, each of each has a set of statistics and set of keys. Each record must have a unique set of keys, but there is no requirement that every record have the same number of keys.

METHODS

The following methods are supported by DBI::ProfileData objects.

$prof = DBI::ProfileData->new(File => dbi.prof)

$prof = DBI::ProfileData->new(Files => [ dbi.prof.1, dbi.prof.2 ])

Creates a a new DBI::ProfileData object. Takes either a single file through the File option or a list of Files in an array ref. If multiple files are specified then the header data from the first file is used.

$copy = $prof->clone();

Clone a profile data set creating a new object.

$header = $prof->header();

Returns a reference to a hash of header values. These are the key value pairs included in the header section of the DBI::ProfileDumper data format. For example:

  $header = {
              Path    => '[ DBIprofile_Statement, DBIprofile_MethodName ]',
              Program => 't/42profile_data.t',
            };

Note that modifying this hash will modify the header data stored inside the profile object.

$nodes = $prof->nodes()

Returns a reference the sorted nodes array. Each element in the array is a single record in the data set. The first seven elements are the same as the elements provided by DBI::Profile. After that each key is in a separate element. For example:

 $nodes = [
            [
              2,                      # 0, count
              0.0312958955764771,     # 1, total duration
              0.000490069389343262,   # 2, first duration
              0.000176072120666504,   # 3, shortest duration
              0.00140702724456787,    # 4, longest duration
              1023115819.83019,       # 5, time of first event
              1023115819.86576,       # 6, time of last event
              'SELECT foo FROM bar'   # 7, key1
              'execute'               # 8, key2
                                      # 6+N, keyN
            ],
                                      # ...
          ];

Note that modifying this array will modify the node data stored inside the profile object.

$count = $prof->count()

Returns the number of items in the profile data set.

$prof->sort(field => field)

$prof->sort(field => field, reverse => 1)

Sorts data by the given field. Available fields are:

  longest
  total
  count
  shortest

The default sort is greatest to smallest, which is the opposite of the normal Perl meaning. This, however, matches the expected behavior of the dbiprof frontend.

$count = $prof->exclude(key2 => disconnect)

$count = $prof->exclude(key2 => disconnect, case_sensitive => 1)

$count = $prof->exclude(key1 => qr/^SELECT/i)

Removes records from the data set that match the given string or regular expression. This method modifies the data in a permanent fashion - use clone() first to maintain the original data after exclude(). Returns the number of nodes left in the profile data set.

$count = $prof->match(key2 => disconnect)

$count = $prof->match(key2 => disconnect, case_sensitive => 1)

$count = $prof->match(key1 => qr/^SELECT/i)

Removes records from the data set that do not match the given string or regular expression. This method modifies the data in a permanent fashion - use clone() first to maintain the original data after match(). Returns the number of nodes left in the profile data set.

$Data = $prof->Data()

Returns the same Data hash structure as seen in DBI::Profile. This structure is not sorted. The nodes() structure probably makes more sense for most analysis.

$text = $prof->format($nodes->[0])

Formats a single node into a human-readable block of text.

$text = $prof->report(number => 10)

Produces a report with the given number of items.

AUTHOR

Sam Tregar <sam@tregar.com>

COPYRIGHT AND LICENSE

This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5 itself.