private function getMissingIndexesByTable()
{
$missingIndexesByTable = [];
foreach ($this->db->listTables() as $tableName) {
$missingIndexes = $this->db->listMissingForeignKeyIndexes($tableName);
if (count($missingIndexes)) {
$missingIndexesByTable[$tableName] = $missingIndexes;
}
}
return $missingIndexesByTable;
}