storageTypeStats.php

Go to the documentation of this file.

<?php
require_once __DIR__ . '/../Maintenance.php';
 
class StorageTypeStats extends Maintenance {
    public function execute() {
        $dbr = $this->getDB( DB_REPLICA );
 
        $endId = $dbr->selectField( 'text', 'MAX(old_id)', '', __METHOD__ );
        if ( !$endId ) {
            $this->fatalError( 'No text rows!' );
        }
 
        $binSize = intval( 10 ** ( floor( log10( $endId ) ) - 3 ) );
        if ( $binSize < 100 ) {
            $binSize = 100;
        }
        echo "Using bin size of $binSize\n";
 
        $stats = [];
 
        $classSql = <<<SQL
            IF(old_flags LIKE '%external%',
                IF(old_text REGEXP '^DB://[[:alnum:]]+/[0-9]+/[0-9a-f]{32}$',
                    'CGZ pointer',
                    IF(old_text REGEXP '^DB://[[:alnum:]]+/[0-9]+/[0-9]{1,6}$',
                        'DHB pointer',
                        IF(old_text REGEXP '^DB://[[:alnum:]]+/[0-9]+$',
                            'simple pointer',
                            'UNKNOWN pointer'
                        )
                    )
                ),
                IF(old_flags LIKE '%object%',
                    TRIM('"' FROM SUBSTRING_INDEX(SUBSTRING_INDEX(old_text, ':', 3), ':', -1)),
                    '[none]'
                )
            )
SQL;
 
        for ( $rangeStart = 0; $rangeStart < $endId; $rangeStart += $binSize ) {
            if ( $rangeStart / $binSize % 10 == 0 ) {
                echo "$rangeStart\r";
            }
            $res = $dbr->select(
                'text',
                [
                    'old_flags',
                    'class' => $classSql,
                    'count' => 'COUNT(*)',
                ],
                [
                    'old_id >= ' . intval( $rangeStart ),
                    'old_id < ' . intval( $rangeStart + $binSize )
                ],
                __METHOD__,
                [ 'GROUP BY' => [ 'old_flags', 'class' ] ]
            );
 
            foreach ( $res as $row ) {
                $flags = $row->old_flags;
                if ( $flags === '' ) {
                    $flags = '[none]';
                }
                $class = $row->class;
                $count = $row->count;
                // @phan-suppress-next-line PhanImpossibleConditionInLoop,PhanPossiblyUndeclaredVariable False positive
                if ( !isset( $stats[$flags][$class] ) ) {
                    $stats[$flags][$class] = [
                        'count' => 0,
                        'first' => $rangeStart,
                        'last' => 0
                    ];
                }
                $entry =& $stats[$flags][$class];
                $entry['count'] += $count;
                $entry['last'] = max( $entry['last'], $rangeStart + $binSize );
                unset( $entry );
            }
        }
        echo "\n\n";
 
        $format = "%-29s %-39s %-19s %-29s\n";
        printf( $format, "Flags", "Class", "Count", "old_id range" );
        echo str_repeat( '-', 120 ) . "\n";
        foreach ( $stats as $flags => $flagStats ) {
            foreach ( $flagStats as $class => $entry ) {
                printf( $format, $flags, $class, $entry['count'],
                    sprintf( "%-13d - %-13d", $entry['first'], $entry['last'] ) );
            }
        }
    }
}
 
$maintClass = StorageTypeStats::class;
require_once RUN_MAINTENANCE_IF_MAIN;