---
name: "mongoc_index_opt_t"
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_index_opt_t"
---

# mongoc\_index\_opt\_t(3)

**WARNING:**

Deprecated since version 1.8.0: See *Manage Collection Indexes* for alternatives.

## SYNOPSIS

```
#include <mongoc/mongoc.h>
typedef struct {
   bool is_initialized;
   bool background;
   bool unique;
   const char *name;
   bool drop_dups;
   bool sparse;
   int32_t expire_after_seconds;
   int32_t v;
   const bson_t *weights;
   const char *default_language;
   const char *language_override;
   mongoc_index_opt_geo_t *geo_options;
   mongoc_index_opt_storage_t *storage_options;
   const bson_t *partial_filter_expression;
   const bson_t *collation;
   void *padding[4];
} mongoc_index_opt_t;
```

## DESCRIPTION

This structure contains the options that may be used for tuning a specific index.

See the *createIndexes documentations* in the MongoDB manual for descriptions of individual options.

**NOTE:**

dropDups is deprecated as of MongoDB version 3.0.0.  This option is silently ignored by the server and unique index builds using this option will fail if a duplicate value is detected.

## EXAMPLE

```
{
   bson_t keys;
   bson_error_t error;
   mongoc_index_opt_t opt;
   mongoc_index_opt_geo_t geo_opt;
   mongoc_index_opt_init (&opt);
   mongoc_index_opt_geo_init (&geo_opt);
   bson_init (&keys);
   BSON_APPEND_UTF8 (&keys, "location", "2d");
   geo_opt.twod_location_min = -123;
   geo_opt.twod_location_max = +123;
   geo_opt.twod_bits_precision = 30;
   opt.geo_options = &geo_opt;
   collection = mongoc_client_get_collection (client, "test", "geo_test");
   if (mongoc_collection_create_index (collection, &keys, &opt, &error)) {
      /* Successfully created the geo index */
   }
   bson_destroy (&keys);
   mongoc_collection_destroy (&collection);
}
```

**SEE ALSO:**

```
mongoc_index_opt_geo_t
```

```
mongoc_index_opt_wt_t
```

## AUTHOR

MongoDB, Inc

## COPYRIGHT

2009-present, MongoDB, Inc.