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# Feed Simulation Overview

You can test your StreamBase application by running it, then sending it a collection of test data in the exact format expected by your application's input streams. A collection of such test data is called a feed simulation.

## Feed Simulation Characteristics

Feed simulations have the following characteristics:

- Feed data can be generated automatically from random data, each field according to its expected data type.

- You can customize your feed data to contain actual sample data, or realistic data of the exact format expected by your input streams.

- Your feed data can be formed from a mix of automatically generated and customized data.

- You can have feed data read from a comma-separated or tab-delimited file, or from a table in a JDBC database.

- You can provide Java code for a custom file reader for non-standard, proprietary, or binary files to serve as the source of your feed data.

- You can ramp up the data rate of your simulated feed to stress-test your application.

- You can save feed simulations as disk files to be shared among developers or used in different projects.

- You can edit saved feed simulation files.

You can run feed simulations in several ways:

- In StreamBase Studio, you can send data manually, one tuple at a time.

- In Studio and on the command line, you can run a generic feed simulation that generates random data.

- In Studio and on the command line, you can run a saved feed simulation file.

## Feed Simulation Topics

The following topics provide the details of creating, maintaining, and running feed simulations for StreamBase applications.

- See Running Feed Simulations to learn how to run saved simulations in StreamBase Studio's Feed Simulation view.

- See Manual Input of Data to learn how to send data to a running application one tuple at a time.

- See Using the Feed Simulation Editor to learn how to define and save feed simulation files.

- See Feed Simulation with a JDBC Data Source to learn the details of using a SQL query to a JDBC database as the source of input tuples for a feed simulation.

- See Feed Simulation Timestamp Options to learn the details of using the Timestamp from column and Include in synchronized timestamp group options of the Feed Simulation Editor.

- See Feed Simulation with Custom File Reader to learn about writing and specifying custom Java code for reading non-standard, proprietary, or binary files as the source of a stream of input tuples for feed simulations.

- See Map to Sub-Fields Option to learn about mapping hierarchical data in CSV files.

- See Command Line Feed Simulations to learn about the command-line utility that runs saved feed simulations at the Windows or UNIX command prompt.

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