====== Sybase 資料庫空間 ======
在 Sybase 如果要看一個資料庫的整體使用空間，其實真的還蠻麻煩的。
後來找到一個 perl 檔可以快速的去計算目前使用量，作為是否要增加 Device 的依據。

該 Perl 檔的來源為：http://www.perlmonks.org/?node_id=130299

===== 相依套件 =====
  * 在 FreeBSD 使用此套件除了 Perl 外還需要安裝下列二個套件
    - p5-DBI
    - p5-DBD-Sybase

===== 使用方式 =====
<code cmd>
check-space.pl -U <user> -P <pwd> -S <server> -D <database>
</code>

===== 程式碼 =====
備份一下，以避免它哪天消失了...

<file perl check-space.pl>
#!/usr/bin/perl -w

use strict;
use DBI;

use Getopt::Long;

my %args;

GetOptions(\%args, '-U=s', '-P=s', '-S=s', '-D=s');

my $dbh = DBI->connect("dbi:Sybase:server=$args{S};database=$args{D}", $args{U}, $args{P});

$dbh->{syb_do_proc_status} = 1;

my $dbinfo;

# First check space in the DB:
my $sth = $dbh->prepare("sp_spaceused");
$sth->execute;
do {
    while(my $d = $sth->fetch) {
        if($d->[0] =~ /$args{D}/) {
            $d->[1] =~ s/[^\d.]//g;
            $dbinfo->{size} = $d->[1];
        } else {
            foreach (@$d) {
                s/\D//g;
            }
            $dbinfo->{reserved} = $d->[0] / 1024;
            $dbinfo->{data} = $d->[1] / 1024;
            $dbinfo->{index} = $d->[2] / 1024;
        }
    }
} while($sth->{syb_more_results});

# Get the actual device usage from sp_helpdb to get the free log space
$sth = $dbh->prepare("sp_helpdb $args{D}");
$sth->execute;
do {
    while(my $d = $sth->fetch) {
        if($d->[2] && $d->[2] =~ /log only/) {
            $d->[1] =~ s/[^\d\.]//g;
            $dbinfo->{log} += $d->[1];
            my ($logfree) = $d->[3] =~ /(\d+)/;
            $dbinfo->{logfree} += $logfree / 1024;
        }
        if($d->[0] =~ /log only .* (\d+)/) {
            $dbinfo->{logfree} = $1 / 1024;
        }
    }
} while($sth->{syb_more_results});

$dbinfo->{size} -= $dbinfo->{log};

my $freepct = ($dbinfo->{size} - $dbinfo->{reserved}) / $dbinfo->{size};

print "$args{S}/$args{D} spaceusage report\n\n";
printf "Database size: %10.2f MB\n", $dbinfo->{size};
printf "Log size:      %10.2f MB\n", $dbinfo->{log};
printf "Free Log:      %10.2f MB\n", $dbinfo->{logfree};
printf "Reserved:      %10.2f MB\n", $dbinfo->{reserved};
printf "Data:          %10.2f MB\n", $dbinfo->{data};
printf "Indexes:       %10.2f MB\n", $dbinfo->{index};
printf "Free space:    %10.2f %%\n", $freepct * 100;

if($freepct < .25) {
    printf "**WARNING**: Free space is below 25%% (%.2f%%)\n\n", $freepct * 100;
}

print "\nTable information (in MB):\n\n";
printf "%30s %15s %10s %10s %10s\n\n", "Table", "Rows", "Reserved", "Data", "Indexes";

my @tables = getTables($dbh);

foreach (@tables) {
    my $sth = $dbh->prepare("sp_spaceused $_");
    $sth->execute;
    do {
        while(my $d = $sth->fetch) {
            foreach (@$d) {
                s/KB//;
                s/\s//g;
            }
            printf("%30.30s %15d %10.2f %10.2f %10.2f\n",
                   $d->[0], $d->[1], $d->[2] / 1024, $d->[3] / 1024,
                   $d->[4] / 1024);
        }
    } while($sth->{syb_more_results});
}


sub getTables {
    my $dbh = shift;

    my $sth = $dbh->table_info;
    my @tables;
    do {
        while(my $d = $sth->fetch) {
            push(@tables, $d->[2]) unless $d->[3] =~ /SYSTEM|VIEW/;
        }
    } while($sth->{syb_more_results});

    @tables;
}
</file>