Redshift - Delete

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Snap Type:

Write

Description:

This Snap executes a SQL delete with the given properties.

ETL Transformations & Data Flow

This Snap enables the following ETL operations/flows:

Snap will delete all the records from the input table when there is no WHERE clause in the Delete condition provided or it will delete only the specific records matching with the WHERE clause provided in the properties.

Input & Output

  • InputThis Snap can have an upstream Snap that can pass a document output view. Such as Structure or JSON Generator.
  • Output: The Snap outputs one document specifying the status as success, along with the count of records that are being deleted from the table. Any error occuring during the process is routed to the error view.


Prerequisites:

None.

Limitations and Known Issues:

Works in Ultra Task Pipelines.

If you use the PostgreSQL driver (org.postgresql.Driver) with the Redshift Snap Pack, it could result in errors if the data type provided to the Snap does not match the data type in the Redshift table schema. Either use the Redshift driver (com.amazon.redshift.jdbc42.Driver) or use the correct data type in the input document to resolve these errors.

Configurations:

Account and Access

This Snap uses account references created on the Accounts page of SnapLogic Manager to handle access to this endpoint. See Redshift Account for information on setting up this type of account.

Views

InputThis Snap has exactly one input view. 
OutputThis Snap has no output views.
Error

This Snap has at most one error view and produces zero or more documents in the view.

Troubleshooting:None at this moment

Settings

Label


Required. The name for the Snap. You can modify this to be more specific, especially if you have more than one of the same Snap in your pipeline.

Schema name

The database schema name. Selecting a schema filters the Table name list to show only those tables within the selected schema. The property is suggestible and will retrieve available database schemas during suggest values.

The values can be passed using the pipeline parameters but not the upstream parameter.

Table name


Required. Table name to execute the delete on,

The values can be passed using the pipeline parameters but not the upstream parameter.


Example: people

Delete Condition (Truncates Table if empty)

This is an expression property to specify the SQL WHERE clause of the delete statement. The delete condition may also be passed via an upstream Snap or through the pipeline parameters.

Specify a valid WHERE clause for the delete condition. If you leave this field blank, the Snap truncates the table.

Examples

Without using expressions

Using expressions

  • "EMPNO=$EMPNO and ENAME=$EMPNAME"

  • email = $email 

  • emp=$emp

  • "emp='" + $emp + "'"

  • "EMPNO=" + $EMPNO + " and ENAME='" + $EMPNAME+ "'"

Caution

Using expressions that join strings together to create SQL queries or conditions has a potential SQL injection risk and is hence unsafe. Ensure that you understand all implications and risks involved before using concatenation of strings with '=' Expression enabled.


Default value:  [None]

Number of retries

Specifies the maximum number of attempts to be made to receive a response. The request is terminated if the attempts do not result in a response.

Example: 3

Default value: 0

  • If the value is larger than 0, the Snap first downloads the target file into a temporary local file. If any error occurs during the download, the Snap waits for the time specified in the Retry interval and attempts to download the file again from the beginning. When the download is successful, the Snap streams the data from the temporary file to the downstream Pipeline. All temporary local files are deleted when they are no longer needed.
  • Ensure that the local drive has sufficient free disk space to store the temporary local file.

Retry interval (seconds)

Specifies the time interval between two successive retry requests. A retry happens only when the previous attempt resulted in an exception. 

Example:  10

Default value: 1

Snap execution

Select one of the three modes in which the Snap executes. Available options are:

  • Validate & Execute: Performs limited execution of the Snap, and generates a data preview during Pipeline validation. Subsequently, performs full execution of the Snap (unlimited records) during Pipeline runtime.
  • Execute only: Performs full execution of the Snap during Pipeline execution without generating preview data.
  • Disabled: Disables the Snap and all Snaps that are downstream from it.

Troubleshooting

Error

Reason

Resolution

type "e" does not exist

This issue occurs due to incompatibilities with the recent upgrade in the Postgres JDBC drivers.

Download the latest 4.1 Amazon Redshift driver here and use this driver in your Redshift Account configuration and retry running the Pipeline.

Examples

Basic Use Case



The following pipeline describes how the Snap functions as a standalone Snap in a pipeline:

In the pipeline below, the Redshift Delete Snap deletes all the records in the demo_rs_teja1 table belonging to the prasanna schema. All the records are deleted since there is no WHERE clause specified in the Delete condition


In the image below a "success" message can be seen denoting the successful execution of the Snap.


Typical Snap Configurations



The key configuration of the Snap lies in how you pass the SQL statements to delete Redshift records. SQL statements can be passed:

  • Without Expression

The pipeline below shows a configuration where a Mapper Snap is used to pass Key-Value pair to the Redshift Delete Snap. 

The image below shows the configuration of the Mapper Snap, here the $id parameter is assigned the value 1.

The image below shows the configuration of the Redshift Delete Snap. Note the Delete condition id>$id. When executed all the records in the table kzhou2 within the prasanna schema where the id is more than 1 will be deleted.



The successful execution of the pipeline displays the below output preview:



  • With Expression
    • Pipeline Parameter: Pipeline parameters set to pass the required Schema name and Table name to the Redshift Delete Snap.


   


Upon execution, the table belonging to the schema, both passed as pipeline parameters Test Schema and Test Table, will be deleted by the Redshift Delete Snap.  

Advanced Use Case


The following describes a pipeline, with a broader business logic involving multiple ETL transformations, that shows how typically in an enterprise environment, Redshift Delete functionality is used. Pipeline download link below (Downloads Section).  

The below pipeline extracts the records from the MySQL database and transfers them to the Redshift database. The Mapper Snap then maps the input and the Target schemas from the Redshift tables for the records to be deleted. The Redshift Select Snap displays the remaining records.

    

  1. Extract: The MySQL Select Snap retrieves the records from a table on the MySQL database.

  2. Transform: The Mapper Snap maps the input schema to the target schema for the records to be deleted.

  3. Load: The Redshift Bulk Load Snap loads the records into a table on the Redshift database.

  4. Extract: The Redshift Select Snap retrieves the remaining records.


Downloads 

Important steps to successfully reuse Pipelines

  1. Download and import the Pipeline into SnapLogic.
  2. Configure Snap accounts as applicable.
  3. Provide Pipeline parameters as applicable.

  File Modified

File redshift-advanced-usecase.slp

Feb 14, 2024 by Kalpana Malladi

File redshift-delete-doc-enhancement-snap.slp

Feb 14, 2024 by Kalpana Malladi


See Also

https://community.snaplogic.com/t/error-on-redshift-delete/10075

Snap Pack History

 Click to view/expand
Release Snap Pack VersionDateType  Updates
February 2024main25112 StableUpdated and certified against the current SnapLogic Platform release.
November 2023main23721

 

StableUpdated and certified against the current SnapLogic Platform release.
August 2023main22460 Stable
  • The Redshift-Bulk Load and Redshift-Bulk Upsert Snaps now support expression enablers for the Additional options field that enables you to use parameters.
  • The Redshift - Execute Snap now includes a new Query type field. When Auto is selected, the Snap tries to determine the query type automatically.


Behavior Change

Starting with version main22460, in the Redshift Select Snap:

  • When you create a table in Redshift, by default, all column names are displayed in lowercase in the output.
  • When you enter column names in uppercase in the Output Field property, the column names are displayed in lowercase in the output.

May 2023

main21015 

Stable

Upgraded with the latest SnapLogic Platform release.

February 2023

432patches20500

 Latest

The Redshift Account no longer fails when a URL is entered in the JDBC URL field and no driver is specified.

February 2023432patches20166 Latest

Updated the description for S3 Security Token field as follows:

Specify the S3 security token part of AWS Security Token Service (STS) authentication. It is not required unless a particular S3 credential is configured to require it.

February 2023432patches20101

  

Latest
  • The JDBC driver class for Redshift accounts is bundled with the com.amazon.redshift.jdbc42.Driver as the default driver. This upgrade is backward-compatible. The existing pipelines will continue to work as expected and the new pipelines will use the Redshift Driver as the default driver. SnapLogic will support providing fixes for the issues you might encounter with accounts that use the PostgreSQL driver only until November 2023.
    After November 2023, SnapLogic will not provide support for the issues with the PostgreSQL driver. Therefore, we recommend you to migrate from the PostgreSQL JDBC driver to the Redshift JDBC driver. Learn more about migrating from the PostgreSQL JDBC Driver to the Amazon Redshift Driver. (432patches20101)

  • The Instance type option in the Redshift Bulk Load Snap enables you to use the Amazon EC2 R6a instance. This property appears only when the parallelism value is greater than one.

February 2023432patches20035

 

Latest

The Redshift Snaps that earlier supported only Redshift Cluster now support Redshift Serverless as well. With Redshift Serverless, you can avoid setting up and managing data warehouse infrastructure when you run or scale analytics.

February 2023main19844 StableUpgraded with the latest SnapLogic Platform release.
November 2022main18944 Stable

The Redshift - Insert Snap now creates the target table only from the table metadata of the second input view when the following conditions are met:

  • The Create table if not present checkbox is selected.

  • The target table does not exist.

  • The table metadata is provided in the second input view.

August 2022430patches17189 Latest
August 2022main17386 Stable

The Redshift accounts support:

  • Expression enabler to pass values from Pipeline parameters.

  • Security Token for S3 bucket external staging.

4.29 Patch429patches16908 Latest
  • Enhanced the Redshift accounts with the following:

    • Expression enabler to pass values from Pipeline parameters.

    • Support for Security Token for S3 bucket external staging.

  • Fixed an issue with Redshift - Execute Snap where the Snap failed when the query contained comments with single or double quotes in it. Now the Pipeline executes without any error if the query contains a comment.

4.29 Patch

429patches15806

 Latest

Fixed an issue with Redshift Account and Redshift SSL Account where the Redshift Snaps failed when the S3 Secret key or S3 Access-key ID contained special characters, such as +.

4.29

main15993

 

Stable

Upgraded with the latest SnapLogic Platform release.

4.28main14627 StableUpdated the label for Delete Condition to Delete Condition (Truncates Table if empty) in the Redshift Delete Snap.
4.27 Patch427patches12999 LatestFixed an issue with the Redshift Bulk Load Snap, where the temporary files in S3 were not deleted for aborted or interrupted Pipelines.
4.27 Patch427patches12999 Latest
4.27main12833 Stable

Enhanced the Redshift - Execute Snap to invoke stored procedures.

4.26main11181 StableUpgraded with the latest SnapLogic Platform release.
4.25 Patch425patches11008 Latest

Updated the AWS SDK from version 1.11.688 to 1.11.1010 in the Redshift Snap Pack and added a custom SnapLogic User Agent header value.

4.25main9554
 
StableUpgraded with the latest SnapLogic Platform release.
4.24main8556
Stable
4.23main7430
 
Stable

Fixed an issue with the Redshift Bulk Load Snap that fails while displaying a Failed to commit transaction error.

4.22main6403
 
StableUpgraded with the latest SnapLogic Platform release.
4.21 Patch421patches6144 Latest

Fixed the following issues with DB Snaps:

  • The connection thread waits indefinitely causing the subsequent connection requests to become unresponsive.
  • Connection leaks occur during Pipeline execution.
4.21 PatchMULTIPLE8841 Latest

Fixed the connection issue in Database Snaps by detecting and closing open connections after the Snap execution ends. 

4.21snapsmrc542

 

StableUpgraded with the latest SnapLogic Platform release.
4.20 Patch db/redshift8774
Latest

Fixed the Redshift - Execute Snap that hangs if the SQL statement field contains only a comment ("-- comment"). 

4.20snapsmrc535
 
StableUpgraded with the latest SnapLogic Platform release.
4.19 Patch db/redshift8410 Latest

Fixed an issue with the Redshift - Update Snap wherein the Snap is unable to perform operations when:

  • An expression is used in the Update condition property.
  • Input data contain the character '?'.
4.19snaprsmrc528
 
StableUpgraded with the latest SnapLogic Platform release.
4.18 Patch db/redshift8043 Latest

Enhanced the Snap Pack to support AWS SDK 1.11.634 to fix the NullPointerException issue in the AWS SDK. This issue occurred in AWS-related Snaps that had HTTP or HTTPS proxy configured without a username and/or password. 

4.18 PatchMULTIPLE7884 Latest

Fixed an issue with the PostgreSQL grammar to better handle the single quote characters.

4.18 PatchMULTIPLE7778 Latest

Updated the AWS SDK library version to default to Signature Version 4 Signing process for API requests across all regions.

4.18snapsmrc523
 
StableUpgraded with the latest SnapLogic Platform release.
4.17 Patchdb/redshift7433 Latest

Fixed an issue with the Redshift Bulk Load Snap wherein the Snap fails to copy the entire data from source to the Redshift table without any statements being aborted.

4.17ALL7402
 
Latest

Pushed automatic rebuild of the latest version of each Snap Pack to SnapLogic UAT and Elastic servers.

4.17snapsmrc515
 
Latest
  • Fixed an issue with the Redshift Execute Snap wherein the Snap would send the input document to the output view even if the Pass through field is not selected in the Snap configuration. With this fix, the Snap sends the input document to the output view, under the key original, only if you select the Pass through field.
  • Added the Snap Execution field to all Standard-mode Snaps. In some Snaps, this field replaces the existing Execute during preview checkbox.
4.16 Patch db/redshift6821 Latest

Fixed an issue with the Lookup Snap passing data simultaneously to output and error views when some values contained spaces at the end.

4.16snapsmrc508
 
StableUpgraded with the latest SnapLogic Platform release.
4.15 Patch db/redshift6286 Latest

Fixed an issue with the Bulk Upsert Snap wherein there was no output for any input schema.

4.15 Patch db/redshift6334 Latest

Replaced Max idle time and Idle connection test period properties with Max life time and Idle Timeout properties, respectively, in the Account configuration. The new properties fix the connection release issues that were occurring due to default/restricted DB Account settings.

4.15snapsmrc500
 
StableUpgraded with the latest SnapLogic Platform release.
4.14 Patch db/redshift5786 Latest

Fixed an issue wherein the Redshift Upload snap logged the access and secret keys without encryption in the error logs. The keys are now masked.

4.14 Patch db/redshift5667 Latest
  • Added "Validate input data" property in the Redshift Bulk Load Snap to enable users to troubleshoot input data schema.
  • Enhanced a check to identify whether the Provided Query in the Redshift Execute Snap is of read or write type.
4.14snapsmrc490
 
StableUpgraded with the latest SnapLogic Platform release.
4.13 Patch db/redshift/5303 Latest

Added a new property "Validate input data" in the Redshift Bulk Load Snap to help users troubleshoot the input data schema.

4.13 Patch db/redshift5186 Latest

Fixed the Bulk Load and Unload Snaps wherein the KMS encryption type property is failing with validation error.

4.13

snapsmrc486

 
Stable

Added KMS encryption support to these Snaps: Redshift Unload, Redshift Bulk Load, Redshift Bulk Upsert, and Redshift S3 Upsert.

4.12 Patch db/redshift5027 Latest

Fixed an issue wherein the Redshift Snaps timeout and fail to retrieve a database connection.

4.12 Patch

MULTIPLE4967 Latest

Provided an interim fix for an issue with the Redshift accounts by re-registering the driver for each account validation. The final fix is being shipped in a separate build.

4.12 Patch

MULTIPLE4744 Latest

Added support for Redshift grammar to recognize window functions as being part of the query statement.

4.12

snapsmrc480

 
StableUpgraded with the latest SnapLogic Platform release.
4.11 Patch db/redshift4589 Latest

Fixed an issue when creating a Redshift table via the second/metadata input view for the Redshift Bulk Load Snap.

4.11snapsmrc465
 
Stable

Added SSL support to the Configuring Redshift Accounts.

4.10 Patch db/redshift4115 Latest

The Upsert or BulkUpdate/BulkLoad shall not execute and produce output when no inputView has been provided.

4.10 Patchredshift3936 Latest

Addressed an issue in Redshift Execute with a Select that hangs after extracting 13 million in the morning or 30 million in the evening 

4.10

snapsmrc414

 
Stable

Added Auto commit property to the Select and Execute Snaps at the Snap level to support overriding of the Auto commit property at the Account level.

4.9.0 Patch

redshift3229 Latest

Addressed an issue in Redshift Multiple Execute where INSERT INTO SELECT statement generated a 'transaction, commit and rollback statements are not supported' exception.

4.9.0 Patch

redshift3073 Latest

Fixed an issue regarding connection not closed after login failure; Expose autocommit for "Select into" statement in PostgreSQL Execute Snap and Redshift Execute Snap

4.9snapsmrc405
 
Stable
  • Updated the Bulk Load, Bulk Upsert and S3 Upsert Snaps with the properties Vacuum type & Vacuum threshold (%) (replaced the original Vacuum property).

  • Update the S3 Upsert Snap with the properties, IAM role and Server-side encryption to support data upsert across two VPCs.

  • Added support for the Redshift driver under the account setting for JDBC jars.

4.8.0 Patchredshift2852 Latest
  • Addressed an issue with Redshift Insert failing with 'casts smallint as varchar'

  • Addressed an issue with Redshift Bulk Upsert fails to drop temp table

4.8.0 Patchredshift2799 Latest
  • Addressed an issue with Redshift Snaps with the default driver failing with could not load JDBC driver for url file.

  • Added the properties, JDBC Driver Class, JDBC jars and JDBC Url to enable the users to upload the Redshift JDBC drivers that can override the default driver.
4.8.0 Patchredshift2758 Latest

Potential fix for JDBC deadlock issue.

4.8.0 Patch

redshift2713 Latest

Fixed Redshift Snap Pack rendering dates that are one hour off from the date returned by database query for non-UTC Snaplexes

4.8.0 Patch

redshift2697 Latest

Addresses an issue where some changes made in the platform patch MRC294 to improve performance caused Snaps in the listed Snap Packs to fail.

4.8

snapsmrc398

 
Stable
  • Redshift MultiExecute Snap introduced in this release.

  • Redshift Account: Info tab added to accounts.

  • Database accounts now invalidate connection pools if account properties are modified and login attempts fail.

  • Info tab added to accounts.
  • Database accounts now invalidate connection pools if account properties are modified and login attempts fail.
4.7.0 Patchredshift2434 Latest

Replaced newSingleThreadExecutor() with a fixed thread pool.

4.7.0 Patch

redshift2387 Latest

Addressed an issue in Redshift Bulk Load Snap where Load Empty String was setting not working after release.

4.7.0 Patch

redshift2223 Latest

Auto-commit is turned off automatically for SELECT

4.7.0 Patch

redshift2201

 

Latest

Fixed an issue for database Select Snaps regarding Limit rows not supporting an empty string from a pipeline parameter.

4.7

snapsmrc382

 
Stable
  • Updated the Redshift Snap Account Settings with the IAM properties that include AWS account ID , IAM role name, and Region name.

  • Redshift Bulk Load Snap updated with the properties IAM Role & Server-side encryption.

  • Redshift Bulk Upsert Snap updated with the properties Load empty stringsIAM Role & Server-side encryption.

  • Updated the Redshift Upsert Snap with Load empty strings property.

  • Updated the Redshift Unload Snap with the property IAM role.

4.6snapsmrc362
 
Stable
  • Redshift Execute Snap enhanced to fully support SQL statements with/without expressions & SQL bind variables.

  • Resolved an issue in Redshift Execute Snap that caused errors when executing a command Select current_schemas(true).

  • Resolved an issues in Redshift Execute Snap that caused errors when a Select * from <table_name> into statement was executed.

  • Enhanced error reporting in Redshift Bulk Load Snap to provided appropriate resolution messages.

4.5.1

redshift1621

 
Latest
  • Redshift S3 Upsert Snap introduced in this release.

  • Resolved an issue that occurred while inserting mismatched data type values in Redshift Insert Snap.

4.5

snapsmrc344

 Stable
  • Resolved an issue in Redshift Bulk Upsert Snap that occurred when purging temp tables.

  • Resolved an issue in Redshift Upload/Upsert Snap that occurred when using IAM credentials in an EC2 instance with an S3 bucket.

4.4.1NA Latest

Resolved an issue with numeric precision when trying to use create table if not present in Redshift Insert Snap.

4.4NA StableUpgraded with the latest SnapLogic Platform release.
4.3.2NA Stable
  • Redshift Select Where clause property now has expression support.

  • Redshift Update Update condition property now has expression support.

  • Resolved an issue with Redshift Select Table metadata being empty if the casing is different from the suggested one for table name

4.3NA Stable
  • Table List Snap: A new option, Compute table graph, now lets you determine whether or not to generate dependents data into the output.

  • Redshift Unload Snap Parallel property now explicitly adds 'PARALLEL [OFF|FALSE]' to the UNLOAD query.

4.2NA Latest
  • Resolved an issue where Redshift SCD2 Snap historized the current row when no Cause-historization fields had changed.

  • Ignore empty result added to Execute and Select Snaps. The option will not any document to the output view for select statements.

  • Resolved an issue with Redshift Select Snap returning a Date object for DATE column data type instead of a LocalDate object.

  • Resolved an issue in RedShift SCD2 failing to close database cursor connection.

  • Resolved an issue with Redshift Lookup Snap not handling values with spaces in the prefix.

  • Updated driver not distributed with the Redshift Snap Pack.

  • Output fields table property added to Select Snap.

  • Resolved an issue with Redshift - Bulk Loader incorrectly writing to wrong location on S3 and disable data compression not working

  • Resolved an issue in Execute and Select Snaps where the output document was the same as the input document if the query produces no data. When there is no result from the SELECT query, the input document will be passed through to the output view as a value to the 'original' key. The new property Pass through with true default.

NANA NA
  • Redshift Account: Enhanced error messaging

  • Redshift SCD2: Bug fixes with compound keys

  • RedShift Lookup: Bug fixes on lookup failures; Pass-though on no lookup match property added to allow you to pass the input document through to the output view when there is no lookup matching.