The target-snowflake Singer target sends data into Snowflake after it was pulled from a source using a Singer tap.

Alternative variants

Multiple variants of target-snowflake are available. This document describes the transferwise variant.

Alternative variants are:

Standalone usage

Install the package using pip:

pip install pipelinewise-target-snowflake

For additional instructions, refer to the README in the repository.

Usage with Meltano

Install Meltano, create your Meltano project, and add the target to your project as a loader:

meltano add loader target-snowflake --variant transferwise

For additional instructions, refer to the Meltano-specific documentation for target-snowflake.

Capabilities

Settings

account

Snowflake account name (i.e. rtXXXXX.eu-central-1)

dbname

Snowflake Database name

user

Snowflake User

password

Snowflake Password

warehouse

Snowflake virtual warehouse name

s3_bucket

S3 Bucket name

stage

Named external stage name created at pre-requirements section. Has to be a fully qualified name including the schema name

file_format

Named file format name created at pre-requirements section. Has to be a fully qualified name including the schema name.

default_target_schema

Name of the schema where the tables will be created, without database prefix. If schema_mapping is not defined then every stream sent by the tap is loaded into this schema.

aws_access_key_id

S3 Access Key Id. If not provided, AWS_ACCESS_KEY_ID environment variable or IAM role will be used

aws_secret_access_key

S3 Secret Access Key. If not provided, AWS_SECRET_ACCESS_KEY environment variable or IAM role will be used

aws_session_token

AWS Session token. If not provided, AWS_SESSION_TOKEN environment variable will be used

aws_profile

AWS profile name for profile based authentication. If not provided, AWS_PROFILE environment variable will be used.

s3_key_prefix

A static prefix before the generated S3 key names. Using prefixes you can upload files into specific directories in the S3 bucket.

s3_endpoint_url

The complete URL to use for the constructed client. This is allowing to use non-native s3 account.

s3_region_name

Default region when creating new connections

s3_acl

S3 ACL name to set on the uploaded files

batch_size_rows

Maximum number of rows in each batch. At the end of each batch, the rows in the batch are loaded into Snowflake.

flush_all_streams

Flush and load every stream into Snowflake when one batch is full. Warning: This may trigger the COPY command to use files with low number of records, and may cause performance problems.

parallelism

The number of threads used to flush tables. 0 will create a thread for each stream, up to parallelism_max. -1 will create a thread for each CPU core. Any other positive number will create that number of threads, up to parallelism_max.

parallelism_max

Max number of parallel threads to use when flushing tables.

default_target_schema_select_permission

Grant USAGE privilege on newly created schemas and grant SELECT privilege on newly created tables to a specific role or a list of roles. If schema_mapping is not defined then every stream sent by the tap is granted accordingly.

schema_mapping

Useful if you want to load multiple streams from one tap to multiple Snowflake schemas. If the tap sends the stream_id in <schema_name>-<table_name> format then this option overwrites the default_target_schema value. Note, that using schema_mapping you can overwrite the default_target_schema_select_permission value to grant SELECT permissions to different groups per schemas or optionally you can create indices automatically for the replicated tables.

disable_table_cache

By default the connector caches the available table structures in Snowflake at startup. In this way it doesn’t need to run additional queries when ingesting data to check if altering the target tables is required. With disable_table_cache option you can turn off this caching. You will always see the most recent table structures but will cause an extra query runtime.

client_side_encryption_master_key

When this is defined, Client-Side Encryption is enabled. The data in S3 will be encrypted, No third parties, including Amazon AWS and any ISPs, can see data in the clear. Snowflake COPY command will decrypt the data once it’s in Snowflake. The master key must be 256-bit length and must be encoded as base64 string.

client_side_encryption_stage_object

Required when client_side_encryption_master_key is defined. The name of the encrypted stage object in Snowflake that created separately and using the same encryption master key.

add_metadata_columns

Metadata columns add extra row level information about data ingestions, (i.e. when was the row read in source, when was inserted or deleted in snowflake etc.) Metadata columns are creating automatically by adding extra columns to the tables with a column prefix _SDC_. The column names are following the stitch naming conventions documented at https://www.stitchdata.com/docs/data-structure/integration-schemas#sdc-columns. Enabling metadata columns will flag the deleted rows by setting the _SDC_DELETED_AT metadata column. Without the add_metadata_columns option the deleted rows from singer taps will not be recongisable in Snowflake.

hard_delete

When hard_delete option is true then DELETE SQL commands will be performed in Snowflake to delete rows in tables. It’s achieved by continuously checking the _SDC_DELETED_AT metadata column sent by the singer tap. Due to deleting rows requires metadata columns, hard_delete option automatically enables the add_metadata_columns option as well.

data_flattening_max_level

Object type RECORD items from taps can be loaded into VARIANT columns as JSON (default) or we can flatten the schema by creating columns automatically. When value is 0 (default) then flattening functionality is turned off.

primary_key_required

Log based and Incremental replications on tables with no Primary Key cause duplicates when merging UPDATE events. When set to true, stop loading data if no Primary Key is defined.

validate_records

Validate every single record message to the corresponding JSON schema. This option is disabled by default and invalid RECORD messages will fail only at load time by Snowflake. Enabling this option will detect invalid records earlier but could cause performance degradation.

temp_dir

(Default: platform-dependent) Directory of temporary CSV files with RECORD messages.

no_compression

Generate uncompressed CSV files when loading to Snowflake. Normally, by default GZIP compressed files are generated.

query_tag

Optional string to tag executed queries in Snowflake. Replaces tokens schema and table with the appropriate values. The tags are displayed in the output of the Snowflake QUERY_HISTORY, QUERY_HISTORY_BY_* functions.

Looking for help?

If you're having trouble getting target-snowflake to work by itself or with Meltano, look for an existing issue in its repository, file a new issue, or join the Meltano Slack community and ask for help in the #plugins-general channel.

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