Snowflake Download File From Stage

Snowflake supports using standard SQL to query data files located in an internal (i.e. Snowflake) stage or named external (Amazon S3, Google Cloud Storage, or Microsoft Azure) stage. This can be useful for inspecting/viewing the contents of the staged files, particularly before loading or after unloading data.

SELECT statements that reference a stage can fail when the object list includes directory blobs. To avoid errors, we recommend using file pattern matching to identify the files for inclusion (i.e. the PATTERN clause) when the file list for a stage includes directory blobs.

Download Zip 🔥 https://tlniurl.com/2y4NXx 🔥

namespace is the database and/or schema in which the internal or external stage resides. It is optional if a database and schema are currently in use within the user session; otherwise, it is required.

To parse a staged data file, it is necessary to describe its file format. The default file format is character-delimited UTF-8 text (i.e. CSV), with the comma character (,) as the field delimiterand new line character as the record delimiter. If the source data is in another format (JSON, Avro, etc.), you must specify the corresponding file format type (and options).

The file format is required in this example to correctly parse the fields in the staged files. In the second query, the file format is omitted, causing the | field delimiter tobe ignored and resulting in the values returned for $1 and $2.

When a temporary internal stage is dropped, all of the files in the stage are purged from Snowflake, regardless of their load status.This prevents files in temporary internal stages from using data storage and, consequently, accruing storage charges. However, this alsomeans that the staged files cannot be recovered through Snowflake once the stage is dropped.

Specifies an existing named file format to use for the stage. The named file format determines the format type (CSV, JSON, etc.), aswell as any other format options, for the data files loaded using this stage. For more details, see CREATE FILE FORMAT.

SNOWFLAKE_FULL: Client-side and server-side encryption. The files are encrypted by a client when it uploads them to the internal stageusing PUT. Snowflake uses a 128-bit encryption key by default. You can configure a 256-bit key by setting the CLIENT_ENCRYPTION_KEY_SIZE parameter.

The s3gov prefix refers to S3 storage in government regions.Note that currently, accessing S3 storage in AWS government regions using a storage integration islimited to Snowflake accounts hosted on AWS in the same government region. Accessing your S3storage from an account hosted outside of the government region using direct credentials issupported.

Note that currently, accessing Azure blob storage in government regions using a storage integrationis limited to Snowflake accounts hosted on Azure in the same government region. Accessing your blob storage from an account hostedoutside of the government region using direct credentials is supported.

Accessing S3 storage in government regions using a storage integration is limited to Snowflake accounts hosted on AWS inthe same government region. Accessing your S3 storage from an account hosted outside of the government region using directcredentials is supported.

Specifies the security credentials for connecting to AWS and accessing the private/protected S3 bucket where the files toload/unload are staged. For more information, see Configuring Secure Access to Amazon S3.

Accessing Azure blob storage in government regionsusing a storage integration is limited to Snowflake accounts hosted on Azure in thesame government region. Accessing your blob storage from an account hosted outsideof the government region using direct credentials is supported.

Specifies the SAS (shared access signature) token for connecting to Azure and accessing the private/protected containerwhere the files containing loaded data are staged. Credentials are generated by Azure.

Specifies whether to automatically refresh the directory table metadata once, immediately after the stage iscreated. Refreshing the directory table metadata synchronizes the metadata with the current list of data filesin the specified stage path. This action is required for the metadata to register any existing datafiles in the named stage specified in the URL = setting.

Specifies whether Snowflake should enable triggering automatic refreshes of the directory table metadata when new or updateddata files are available in the named external stage specified in the [ WITH ] LOCATION = setting.

If the SINGLE copy option is TRUE, then the COPY command unloads a file without a file extension by default. To specify a file extension, provide a file name and extension in theinternal_location or external_location path (e.g. copy into @stage/data.csv).

For loading data from delimited files (CSV, TSV, etc.), UTF-8 is the default. . . For loading data from all other supported file formats (JSON, Avro, etc.), as well as unloading data, UTF-8 is the only supported character set.

String used to convert to and from SQL NULL. Snowflake replaces these strings in the data load source with SQL NULL. Tospecify more than one string, enclose the list of strings in parentheses and use commas to separate each value.

Note that the SKIP_FILE action buffers an entire file whether errors are found or not. For this reason, SKIP_FILE is slower than either CONTINUE or ABORT_STATEMENT. Skipping large files due to a small number of errors could result in delays and wasted credits. When loading large numbers of records from files that have no logical delineation (e.g. the files were generated automatically at rough intervals), consider specifying CONTINUE instead.

For example, suppose a set of files in a stage path were each 10 MB in size. If multiple COPY statements set SIZE_LIMIT to 25000000 (25 MB), each would load 3 files. That is, each COPY operation would discontinue after the SIZE_LIMIT threshold was exceeded.

If this option is set to TRUE, note that a best effort is made to remove successfully loaded data files. If the purge operation fails for any reason, no error is returned currently. We recommend that you list staged files periodically (using LIST) and manually remove successfully loaded files, if any exist.

This is because an external table links to a stage using a hidden ID rather than the name of the stage. Behind the scenes, the CREATE ORREPLACE syntax drops an object and recreates it with a different hidden ID.

If you must recreate a stage after it has been linked to one or more external tables, you must recreate each of the external tables(using CREATE OR REPLACE EXTERNAL TABLE) to reestablish the association. Call the GET_DDL function toretrieve a DDL statement to recreate each of the external tables.

Any pipes that reference the stage stop loading data. The execution status of the pipes changes to STOPPED_STAGE_DROPPED. Toresume loading data, these pipe objects must be recreated (using the CREATE OR REPLACE PIPE syntax).

Create an external stage using a private/protected S3 bucket named load with a folder path named files. TheSnowflake access permissions for the S3 bucket are associated with an IAM user; therefore, IAM credentials are required:

Create an external stage using an S3 bucket named load with a folder path named encrypted_files and client-sideencryption (default encryption type) with the master key to decrypt/encrypt files stored in the bucket:

Create an external stage using an S3 bucket named load with a folder path named encrypted_files and AWS_SSE_KMSserver-side encryption with the ID for the master key to decrypt/encrypt files stored in the bucket:

Same example as the immediately preceding example, except that the Snowflake access permissions for the S3 bucket as associatedwith an IAM role instead of an IAM user. Note that credentials are handled separately from other stage parameters such asENCRYPTION. Support for these other parameters is the same regardless of the credentials used to access your externalS3 bucket:

Create a stage named mystage with a directory table in the active schema for the user session. The cloud storage URLincludes the path files. The stage references a storage integration named my_storage_int: e24fc04721