Include semaphore to reset stats expiry to 0 only once

Author: leissbua

app/code/core/Mage/ImportExport/Model/Resource/Helper/Mysql4.php

@@ -27,6 +27,11 @@ class Mage_ImportExport_Model_Resource_Helper_Mysql4 extends Mage_Core_Model_Res
     public const DB_MAX_PACKET_SIZE        = 1048576; // Maximal packet length by default in MySQL
     public const DB_MAX_PACKET_COEFFICIENT = 0.85; // The coefficient of useful data from maximum packet length
 
+    /**
+     * Semaphore to disable schema stats only once
+     */
+    private static boolean $instantInformationSchemaStatsExpiry = false;
+    
     /**
      * Returns maximum size of packet, that we can send to DB
      *
@@ -49,11 +54,23 @@ public function getMaxDataSize()
     public function getNextAutoincrement($tableName)
     {
         $adapter = $this->_getReadAdapter();
-        $adapter->query('SET information_schema_stats_expiry = 0;');
+        $this->setInformationSchemaStatsExpiry();
         $entityStatus = $adapter->showTableStatus($tableName);
         if (empty($entityStatus['Auto_increment'])) {
             Mage::throwException(Mage::helper('importexport')->__('Cannot get autoincrement value'));
         }
         return $entityStatus['Auto_increment'];
     }
+
+    /**
+     * Set information_schema_stats_expiry to 0 if not already set.
+     */
+    public function setInformationSchemaStatsExpiry()
+    {
+        if (!self::$instantInformationSchemaStatsExpiry) {
+            // Set information_schema_stats_expiry to 0
+            $this->getReadAdapter()->query('SET information_schema_stats_expiry = 0;');
+            self::$instantInformationSchemaStatsExpiry = true;
+        }
+    }
 }