PHP mongoDB 从百万条记录中过滤计数工作非常缓慢

Question

I am using below PHP code to get count of total entries in MongoDB

$command = new \MongoDB\Driver\Command(['count' => 'log_master', 'query' => $filter]);
    try {
        $cursor = $m->executeCommand('DB_name', $command);
    } catch (\MongoDB\Driver\Exception\Exception $e) {
        $error_message = $e->getMessage();
    }

$count = $cursor->toArray()[0]->n;

it works fine but takes too much time if filters are on two or three fields. Records in table are around 50 millions. How I can speed up count query

Answer 1

Most probably you need to start indexing your data. Here are official docs and a tutorial . To see how your query is being executed you may employ explain() method in shell .