Stats on the blob_orphans table, to make sure we're not losing anything by dropping...

diff --git a/maintenance/storage/orphanStats.php b/maintenance/storage/orphanStats.php
new file mode 100644 (file)
index 0000000..77bf465
--- /dev/null
+++ b/maintenance/storage/orphanStats.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Show some statistics on the blob_orphans table, created with trackBlobs.php
+ */
+require_once( dirname(__FILE__).'/../commandLine.inc' );
+
+$stats = new OrphanStats;
+$stats->execute();
+
+class OrphanStats {
+       function getDB( $cluster ) {
+               $lb = wfGetLBFactory()->getExternalLB( $cluster );
+               return $lb->getConnection( DB_SLAVE );
+       }
+
+       function execute() {
+               $extDBs = array();
+               $dbr = wfGetDB( DB_SLAVE );
+               $res = $dbr->select( 'blob_orphans', '*', false, __METHOD__ );
+               
+               $num = 0;
+               $totalSize = 0;
+               $hashes = array();
+               $maxSize = 0;
+
+               foreach ( $res as $boRow ) {
+                       $extDB = $this->getDB( $boRow->bo_cluster );
+                       $blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );
+                       
+                       $num++;
+                       $size = strlen( $blobRow->blob_text );
+                       $totalSize += $size;
+                       $hashes[ sha1( $blobRow->blob_text ) ] = true;
+                       $maxSize = max( $size, $maxSize );
+               }
+               unset( $res );
+
+               echo "Number of orphans: $num\n" .
+                       "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
+                       "Max size: $maxSize\n" . 
+                       "Number of unique texts: " . count( $hashes ) . "\n";
+       }
+}