---
name: "mongoc_client_set_read_prefs"
section: "3"
platform: "linux"
package: "libmongoc-doc"
version: "1.30.4-1+deb13u3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/mongoc_client_set_read_prefs"
---

# mongoc\_client\_set\_read\_prefs(3)

## SYNOPSIS

```
void
mongoc_client_set_read_prefs (mongoc_client_t *client,
                              const mongoc_read_prefs_t *read_prefs);
```

Sets the default read preferences to use with future operations upon **client**.

The global default is to read from the replica set primary.

It is a programming error to call this function on a client from a *mongoc\_client\_pool\_t*. For pooled clients, set the read preferences with the *MongoDB URI* instead.

Please see the MongoDB website for a description of *Read Preferences*.

## PARAMETERS

- •

  **client**: A *mongoc\_client\_t*.

- •

  **read\_prefs**: A *mongoc\_read\_prefs\_t*.

## AUTHOR

MongoDB, Inc

## COPYRIGHT

2009-present, MongoDB, Inc.