连接选项

Specifies the application name that the Client instance sends to the server as part of the handshake.

Specifying an appName can help you use the server logs to determine which Client instance is connected to the server.

Specifies the database used to authenticate.

This option defaults to admin for SCRAM-based authentication mechanisms, $external for the MONGODB-X509 mechanism, and the database name or $external for the PLAIN mechanism.

Specifies the amount of time in milliseconds that the average round-trip time between the driver and server can last compared to the shortest round-trip time of all the suitable servers.

A value of 0 indicates that there is no latency window, so only the server with the lowest average round-trip time is eligible.

Specifies the amount of time in milliseconds that a connection can remain idle in a connection pool the server closes it.

A value of 0 indicates that the client does not close idle connections.

Specifies the maximum lag, in seconds, behind the primary node that a secondary node can be to be considered for the given operation.

The value of this option must be at least 90, or the operation raises an error. A value of -1 means there is no maximum lag.

Specifies the maximum number of connections that the Client instance can create in a connection pool for a given server.

If you attempt an operation while the value of maxPoolSize connections are checked out, the operation waits until an in-progress operation finishes and the connection returns to the pool.

Specifies the minimum number of connections that are available in a server's connection pool at a given time.

If fewer than minPoolSize connections are in the pool, the server adds connections in the background up to the value of minPoolSize.

Specifies whether the Client instance returns an error if the server presents an invalid certificate.

We recommend that you set this option to true only in testing environments to avoid creating vulnerabilities in your application.

Specifies the path to the certificate authority (CA) file that the Client instance uses for TLS.

If you do not specify this option, the driver uses the Mozilla root certificates from the webpki-roots crate.

Specifies the path to the certificate file that the Client instance presents to the server to verify its identify.

If you do not set this option, the Client instance does not attempt to verify its identity to the server.

Specifies whether the Client instance returns an error if the server presents an invalid certificate.

We recommend that you set this option to true only in testing environments to avoid creating vulnerabilities in your application.

Requests acknowledgment that the operation has propagated to a specific number or variety of servers.

To learn more, see Write Concern in the Server manual.

Specifies the level field of the zlib compression if you use that compressor.

Setting a value of -1 selects the default compression level (6).

Setting a value of 0 specifies no compression, and setting a value of 9 specifies maximum compression.

To learn more about network compression, see the Network Compression guide.