> For the complete documentation index, see [llms.txt](https://upsolver.gitbook.io/content/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upsolver.gitbook.io/content/reference-1/sql-commands/iceberg-tables/mirror-iceberg-tables/create-mirror.md).

# CREATE MIRROR

Prior to creating a mirror on your table, please ensure you create a catalog integration and S3 volume in Snowflake, and create the table you want to mirror. See [this](/content/how-to-guides-1/data/query-upsolver-iceberg-tables-from-snowflake.md) guide for instructions.

## Syntax

```sql
CREATE MIRROR FOR <table_identifier>
    IN <snowflake_connection_name.schema.tbl_name>
    CATALOG_INTEGRATION = <CATALOG_INTEGRATION>
    EXTERNAL_VOLUME = <EXTERNAL_VOLUME>
    MIRROR_INTERVAL = <integer> { MINUTE[S] | HOUR[S] | DAY[S] };
```

**Jump to:**

* [Table identifier](#table-identifier)
* [IN](#in)
* [CATALOG\_INTEGRATION](#catalog_integration)
* [EXTERNAL\_VOLUME](#external_volume)
* [MIRROR\_INTERVAL](#mirror_interval)

#### Table identifier

Table identifiers are provided in the following format:

```sql
<catalog_name>.<schema_name>.<table_name>
```

Note that only metastore connection types are accepted for the catalog name.

Valid table names match the following identifier format:

```sql
identifier = "([^"]|"")*"|[A-Za-z_][A-Za-z0-9_]*;
```

#### `IN`

This is the table identifier for your Snowflake table where your data will be mirrored. This should be in the following format:

```sql
<snowflake_connection_name>.<schema_name>.<table_name>
```

#### `CATALOG_INTEGRATION`

The name of the catalog integration created in Snowflake.

#### `EXTERNAL_VOLUME`

The name of the external volume created in Snowflake.

#### `MIRROR_INTERVAL`**— editable**

Value:  integer {MINUTE\[S] | HOUR\[S] | DAY\[S] }

Default: 1 MINUTE

(Optional) How often the Snowflake mirror table is updated.

Set this option to update your Snowflake table less frequently than your Iceberg table in order to control Snowflake costs.

***

## Example

```sql
CREATE MIRROR FOR default_glue_catalog.demo.my_iceberg_table
    IN my_snowflake_connection.mirror_demo_schema.mirror_iceberg_tbl
    CATALOG_INTEGRATION = my_catalog_int
    EXTERNAL_VOLUME = iceberg_volume
    MIRROR_INTERVAL = 1 HOUR; 
```


---

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