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Read @@global object variable when SHOW VARIABLES returns a potentially truncated value

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This commit is contained in:
Maciej Dobrzanski
2024-12-03 20:28:01 +01:00
parent 446896d278
commit bcbb4e59ab
1 changed files with 19 additions and 1 deletions
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20
bin/pt-config-diff
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@@ -3066,7 +3066,25 @@ sub _parse_config {
my $sql = "SHOW /*!40103 GLOBAL*/ VARIABLES"; my $sql = "SHOW /*!40103 GLOBAL*/ VARIABLES";
PTDEBUG && _d($dbh, $sql); PTDEBUG && _d($dbh, $sql);
my $rows = $dbh->selectall_arrayref($sql); my $rows = $dbh->selectall_arrayref($sql);
$config_data{vars} = { map { @$_ } @$rows }; $config_data{vars} = { map {
my ($variable, $value) = @$_;
# MySQL 5.7.6+ implement SHOW VARIABLES by
# displaying records from performance_schema
# table called global_variables. The table
# truncates values at 1024 characters, but
# some variables may be set to longer values.
# The full value can still be accessed through
# the @@global object.
if (length($value) >= 1024) {
my $var_sql = "SELECT \@\@global.$variable";
PTDEBUG && _d($dbh, $var_sql);
my $var_sth = $dbh->prepare($var_sql);
$var_sth->execute();
($value) = $var_sth->fetchrow_array();
}
$variable => $value
} @$rows
};
$config_data{mysql_version} = _get_version($dbh); $config_data{mysql_version} = _get_version($dbh);
} }
else { else {