# tSnowflakeRollback
Cancels the transaction commit in the Snowflake database to avoid committing part of a transaction involuntarily.
This component is not shipped with your Talend Studio by default. You need to install it using the Feature Manager. For more information, see [Installing features using the Feature Manager](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/install-features-to-talend-studio).
## tSnowflakeRollback Standard properties
These properties are used to configure tSnowflakeRollback running in the Standard Job framework.
The Standard tSnowflakeRollback component belongs to the Cloud family.
The component in this framework is available in all Talend products.
Information noteNote: This component is a specific version of a dynamic database connector. The properties related to database settings vary depending on your database type selection. For more information about dynamic database connectors, see [DB Generic components](https://help.qlik.com/talend/r/en-US/8.0/components/db-generic/db-generic-component).
## Basic settings
| Properties | Description |
| --- | --- |
| Database | Select the desired database type from the list and click
Apply. |
| Connection Component | Select the component in the list if more than one connection are planned for
the current Job. |
| Close Connection | Clear this check box to continue to close the selected connection once the
component has performed its task. |
## Advanced settings
| Properties | Description |
| --- | --- |
| tStatCatcher Statistics | Select this check box to collect log data at the component level. |
## Global variables
| Variables | Description |
| --- | --- |
| ERROR\_MESSAGE | The error message generated by the component when an error occurs. This
is an After variable and it returns a string. |
## Usage
| Usage guidance | Description |
| --- | --- |
| **Usage rule** | This component is designed to work with tSnowflakeRow, tSnowflakeBulkExec,
and tSnowflakeOutputBulkExec components.
When this component works with a
tSnowflakeRow component with no input or output row, changes made to the
database are rolled back by the tSnowflakeRollback component.
When this
component works with a tSnowflakeRow component with an input row, the
tSnowflakeRollback component takes the charge of rolling back changes made to
the database if the Commit every option of the
tSnowflakeRow component is set to 0 or
1; the tSnowflakeRollback component will be ignored
if the value of the Commit every option of the
tSnowflakeRow component is larger than 1. |
| Dynamic settings | Click the [+] button to add a row in the table
and fill the Code field with a context
variable to choose your database connection dynamically from multiple
connections planned in your Job. This feature is useful when you need to
access database tables having the same data structure but in different
databases, especially when you are working in an environment where you
cannot change your Job settings, for example, when your Job has to be
deployed and executed independent of Talend Studio.
Once a dynamic parameter is defined, the Component List box in the Basic
settings view becomes unusable.
For examples on using dynamic parameters, see [Reading data from databases through
context-based dynamic connections](https://help.qlik.com/talend/r/en-US/8.0/components/defining-context-groups/reading-data-from-databases-through-context-based-dynamic-connections) and [Reading data from different MySQL databases
using dynamically loaded connection parameters](https://help.qlik.com/talend/r/en-US/8.0/components/context/reading-data-from-different-mysql-databases-using-dynamically-loaded-connection-parameters). For more information on
Dynamic settings and context variables, see
[Dynamic schema](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/dynamic-schema) and [Creating a context group and define context
variables in it](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/creating-context-group-and-define-context-variables-in-it). |