If you try delete hosts with more than 16k items, 384MB of memory in php.ini isn't sufficient using zabbix api or frontend, having "out of memory" error in log.

I think that 384MB of memory for delete is quite huge, so i analize the error:

Allowed memory size of 402653184 bytes exhausted (tried to allocate 72 bytes) in /usr/share/zabbix/include/classes/db/DB.php on line 502"

Close to the line cited the function called is insertBatch. For me, the variable $values not should be updated, because isn't used in code.

foreach ($values as $key => $row) {
if ($getids)

Unknown macro: { $resultIds[$key] = $id; $row[$tableSchema['key']] = $id; $values[$key][$tableSchema['key']] = $id; $id = bcadd($id, 1, 0); }

self::checkValueTypes($table, $row);
$newValues[] = $row;
}

For test, i comment the line "$values[$key][$tableSchema['key']] = $id;" and the out of memory doesn't occur (the hosts are deleted correctly).

maybe I did not understand the logic, but is necessary update $values in a foreach loop of $values if it is not reffered after setted?

I think that update of $values is unnecessary, because allocate a lot of memory uselessly.