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<?php
/*
* Copyright (c) 2008 Guillaume Lelarge <guillaume@lelarge.info>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
$buffer = $navigate_dbobjects.'
<div id="pgContentWrap">
<h1>Relations Bloat</h1>
';
$query = "SELECT
schemaname, tablename, reltuples::bigint, relpages::bigint, otta,
ROUND(CASE WHEN otta=0 THEN 0.0 ELSE sml.relpages/otta::numeric END,1) AS tbloat,
relpages::bigint - otta AS wastedpages,
bs*(sml.relpages-otta)::bigint AS wastedbytes,
pg_size_pretty((bs*(relpages-otta))::bigint) AS wastedsize,
iname, ituples::bigint, ipages::bigint, iotta,
ROUND(CASE WHEN iotta=0 OR ipages=0 THEN 0.0 ELSE ipages/iotta::numeric END,1) AS ibloat,
CASE WHEN ipages < iotta THEN 0 ELSE ipages::bigint - iotta END AS wastedipages,
CASE WHEN ipages < iotta THEN 0 ELSE bs*(ipages-iotta) END AS wastedibytes,
CASE WHEN ipages < iotta THEN pg_size_pretty(0) ELSE pg_size_pretty((bs*(ipages-iotta))::bigint) END AS wastedisize
FROM (
SELECT
schemaname, tablename, cc.reltuples, cc.relpages, bs,
CEIL((cc.reltuples*((datahdr+ma-
(CASE WHEN datahdr%ma=0 THEN ma ELSE datahdr%ma END))+nullhdr2+4))/(bs-20::float)) AS otta,
COALESCE(c2.relname,'?') AS iname, COALESCE(c2.reltuples,0) AS ituples, COALESCE(c2.relpages,0) AS ipages,
COALESCE(CEIL((c2.reltuples*(datahdr-12))/(bs-20::float)),0) AS iotta -- very rough approximation, assumes all cols
FROM (
SELECT
ma,bs,schemaname,tablename,
(datawidth+(hdr+ma-(case when hdr%ma=0 THEN ma ELSE hdr%ma END)))::numeric AS datahdr,
(maxfracsum*(nullhdr+ma-(case when nullhdr%ma=0 THEN ma ELSE nullhdr%ma END))) AS nullhdr2
FROM (
SELECT
schemaname, tablename, hdr, ma, bs,
SUM((1-null_frac)*avg_width) AS datawidth,
MAX(null_frac) AS maxfracsum,
hdr+(
SELECT 1+count(*)/8
FROM pg_stats s2
WHERE null_frac<>0 AND s2.schemaname = s.schemaname AND s2.tablename = s.tablename
) AS nullhdr
FROM pg_stats s, (
SELECT
(SELECT current_setting('block_size')::numeric) AS bs,
CASE WHEN substring(v,12,3) IN ('8.0','8.1','8.2') THEN 27 ELSE 23 END AS hdr,
CASE WHEN v ~ 'mingw32' THEN 8 ELSE 4 END AS ma
FROM (SELECT version() AS v) AS foo
) AS constants
GROUP BY 1,2,3,4,5
) AS foo
) AS rs
JOIN pg_class cc ON cc.relname = rs.tablename
JOIN pg_namespace nn ON cc.relnamespace = nn.oid AND nn.nspname = rs.schemaname
LEFT JOIN pg_index i ON indrelid = cc.oid
LEFT JOIN pg_class c2 ON c2.oid = i.indexrelid
) AS sml
WHERE sml.relpages - otta > 0 OR ipages - iotta > 10
ORDER BY wastedbytes DESC, wastedibytes DESC;
";
$rows = pg_query($connection, $query);
if (!$rows) {
echo "An error occured.\n";
exit;
}
$buffer .= '<div class="tblBasic">
<table border="0" cellpadding="0" cellspacing="0" class="tblBasicGrey">
<tr>
<th class="colFirst">Schema</th>
<th class="colMid">Table</th>
<th class="colMid">Table Tuples</th>
<th class="colMid">Table Pages</th>
<th class="colMid">Otta</th>
<th class="colMid">Table Bloat</th>
<th class="colMid">Wasted Pages</th>
<th class="colMid">Wasted Bytes</th>
<th class="colMid">Wasted Size</th>
<th class="colMid">Index</th>
<th class="colMid">Index Tuples</th>
<th class="colMid">Index Pages</th>
<th class="colMid">Index Otta</th>
<th class="colMid">Index Bloat</th>
<th class="colMid">Wasted Index Pages</th>
<th class="colMid">Wasted Index Bytes</th>
<th class="colLast">Wasted Index Size</th>
</tr>
';
while ($row = pg_fetch_array($rows)) {
$buffer .= tr()."
<td>".$row['schemaname']."</td>
<td>".$row['tablename']."</td>
<td>".$row['reltuples']."</td>
<td>".$row['relpages']."</td>
<td>".$row['otta']."</td>
<td>".$row['tbloat']."</td>
<td>".$row['wastedpages']."</td>
<td>".$row['wastedbytes']."</td>
<td>".$row['wastedsize']."</td>
<td>".$row['iname']."</td>
<td>".$row['ituples']."</td>
<td>".$row['ipages']."</td>
<td>".$row['iotta']."</td>
<td>".$row['ibloat']."</td>
<td>".$row['wastedipages']."</td>
<td>".$row['wastedibytes']."</td>
<td>".$row['wastedisize']."</td>
</tr>";
}
$buffer .= '</table>
</div>
';
$buffer .= '<button id="showthesource">Show SQL commands!</button>
<div id="source">
<p>'.$query.'</p>
</div>';
$filename = $outputdir.'/relationsbloat.html';
include 'lib/fileoperations.php';
?>
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