a problem about pool size

[Li Jiang]

I used the node-mongodb-native in some projects, i confused by a problem that when and how to use poolsize in MongoDB native driver;can  you help me to resolve this problem? Thank you.

[Wes Freeman]

It's for when you want to be able to use the connection to do more than one query at a time.

This is a bit tricky, because you do queries asynchronously, so you might end up doing more than one at a time unintentionally.

Wes

[Tom]

Are you sure Wes? I was of the impression that it actually creates
multiple connections with the database servers, thereby achieving
asynchornous queries. With one connection you cannot perform queries
asynchronously.

I would consider this normal behavior. In fact I believe that the
default pool size should be bigger than one, because the current
setting of one may cause people to rely on the accompanying
"unintentioned synchronousness".

Tom

[Wes Freeman]

I know that by default it only uses one connection, but maybe it can handle multiple queries at once without safe:true. Maybe I'm thinking of when you use safe:true and callbacks... it's been a while since I was deeper in the driver. Anyone else want to chime in?

[Wes Freeman]

Sorry Tom, I totally misread your comment. Yes, it (pooling) is for having multiple connections open to the server so that you can run multiple queries/inserts/updates at the same time. It actually does create multiple connections with connection pooling enabled. That's what I meant to say in my initial response, but I was less than clear.

[christkv]

The driver defaults to 5 connections these days (poolSize:5).

[Wes Freeman]

Oh, cool. That's good to know.

Wes

[Li Jiang]

Thank you for your answers.I want to know the poolsize how to work in the mongodb.Thanks again
在 2012年9月17日星期一UTC+8上午9时12分42秒，Li Jiang写道：