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Rollback segments contention should be counted as ratio of waits to t… #15

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Rollback segments contention should be counted as ratio of waits to t… #15

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22 changes: 12 additions & 10 deletions plugins-scripts/Nagios/DBD/Oracle/Server/Instance/SGA/RollbackSegments.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -67,43 +67,45 @@ sub init {
}
} elsif ($params{mode} =~
/server::instance::sga::rollbacksegments::headercontention/) {
($self->{undo_header_waits}, $self->{waits}) = $self->{handle}->fetchrow_array(q{
($self->{undo_header_waits}, $self->{gets}) = $self->{handle}->fetchrow_array(q{
SELECT (
SELECT SUM(count)
FROM v$waitstat
WHERE class = 'undo header' OR class = 'system undo header'
) undo, (
SELECT SUM(count)
FROM v$waitstat
SELECT SUM(value)
FROM v$sysstat
WHERE name IN ('db block gets', 'consistent gets')
) complete
FROM DUAL
});
if (! defined $self->{undo_header_waits}) {
$self->add_nagios_critical("unable to get rollback segments wait stats");
} else {
$self->valdiff(\%params, qw(undo_header_waits waits));
$self->valdiff(\%params, qw(undo_header_waits gets));
$self->{rollback_segment_header_contention} =
$self->{delta_waits} ? 100 * $self->{delta_undo_header_waits} / $self->{delta_waits} : 0;
$self->{delta_gets} ? 100 * $self->{delta_undo_header_waits} / $self->{delta_gets} : 0;
}
} elsif ($params{mode} =~
/server::instance::sga::rollbacksegments::blockcontention/) {
($self->{undo_block_waits}, $self->{waits}) = $self->{handle}->fetchrow_array(q{
($self->{undo_block_waits}, $self->{gets}) = $self->{handle}->fetchrow_array(q{
SELECT (
SELECT SUM(count)
FROM v$waitstat
WHERE class = 'undo block' OR class = 'system undo block'
) undo, (
SELECT SUM(count)
FROM v$waitstat
SELECT SUM(value)
FROM v$sysstat
WHERE name IN ('db block gets', 'consistent gets')
) complete
FROM DUAL
});
if (! defined $self->{undo_block_waits}) {
$self->add_nagios_critical("unable to get rollback segments wait stats");
} else {
$self->valdiff(\%params, qw(undo_block_waits waits));
$self->valdiff(\%params, qw(undo_block_waits gets));
$self->{rollback_segment_block_contention} =
$self->{delta_waits} ? 100 * $self->{delta_undo_block_waits} / $self->{delta_waits} : 0;
$self->{delta_gets} ? 100 * $self->{delta_undo_block_waits} / $self->{delta_gets} : 0;
}
} elsif ($params{mode} =~
/server::instance::sga::rollbacksegments::hitratio/) {
Expand Down