MAGETWO-68808: catalog_product_attribute is slow

Author: kandy

app/code/Magento/Catalog/Model/Indexer/Product/Eav/AbstractAction.php

@@ -148,12 +148,13 @@ protected function syncData($indexer, $destinationTable, $ids)
      * @param \Magento\Catalog\Model\ResourceModel\Product\Indexer\Eav\AbstractEav $indexer
      * @param array $ids
      *
-     * @return $ids
+     * @param bool $onlyParents
+     * @return array $ids
      */
-    protected function processRelations($indexer, $ids)
+    protected function processRelations($indexer, $ids, $onlyParents = false)
     {
         $parentIds = $indexer->getRelationsByChild($ids);
-        $childIds = $indexer->getRelationsByParent($ids);
+        $childIds = $onlyParents ? [] : $indexer->getRelationsByParent($ids);
         return array_unique(array_merge($ids, $childIds, $parentIds));
     }
 }

app/code/Magento/Catalog/Model/Indexer/Product/Eav/Action/Full.php

@@ -83,7 +83,7 @@ public function execute($ids = null)
                     $select->from(['e' => $entityMetadata->getEntityTable()], $entityMetadata->getIdentifierField());
                     $entityIds = $this->batchProvider->getBatchIds($connection, $select, $batch);
                     if (!empty($entityIds)) {
-                        $indexer->reindexEntities($this->processRelations($indexer, $entityIds));
+                        $indexer->reindexEntities($this->processRelations($indexer, $entityIds, true));
                         $this->syncData($indexer, $mainTable);
                     }
                 }

app/code/Magento/Catalog/Model/ResourceModel/Product/Indexer/AbstractIndexer.php

@@ -196,7 +196,7 @@ public function getRelationsByChild($childIds)
             $childIds
         );
 
-        return $connection->fetchCol($select);
+        return array_map('intval', (array) $connection->fetchCol($select));
     }
 
     /**
@@ -228,7 +228,7 @@ public function getRelationsByParent($parentIds)
             $result = $connection->fetchCol($select);
         }
 
-        return $result;
+        return array_map('intval', $result);
     }
 
     /**

lib/internal/Magento/Framework/Indexer/BatchProvider.php

@@ -58,7 +58,7 @@ public function getBatchIds(
             $connection->quote($batch['to'])
         );
 
-        $ids = $connection->fetchCol($select->where($betweenCondition));
+        $ids = $connection->fetchCol($select->where($betweenCondition)->limit($batch['from'] - $batch['to'] + 1));
         return array_map('intval', $ids);
     }
 }