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Fiona Sargeant (Unlicensed)

Fiona Sargeant (Unlicensed)

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Streams are a key model component. They represent a structured store of data within PhixFlow receiving data from one or more components, processing it then storing it.

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The tab toolbar has the following additional buttons: 

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, 
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.

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The grid contains a list of the stream attributes in the stream. This section has a toolbar with standard buttons and 

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 and 
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The grid lists the attributes (data columns) in the stream data. To edit the properties of an attribute, double-click the attribute name to open the Stream Attributes properties.

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To add an existing attribute to the list:

  1. Click 
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     to list the streams available in the repository.
  2. Expand a stream to show its attributes.
  3. Drag an attribute into this list to add it. 

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The grid contains a list of actions that use the stream. This section has a toolbar with standard buttons.

To edit the properties of an action, double-click the attribute name. To add an action to the list, click  

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. PhixFlow opens a new Action properties tab.

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The grid contains a list of stream item actions that can update the stream. This section has a toolbar with standard buttons.

To edit the properties of an action, double-click the attribute name. To add an action to the list, click  

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. PhixFlow opens a new to open the Stream Item Actions properties tab.

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The grid contains a list of the data views for this stream. This section has a toolbar with standard buttons.

o edit the properties of an stream view, double-click the attribute name to open its Stream View properties tab.

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Download Limits 
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The following options affect the number of data records a user can download from a stream view, such as a table (grid), chart or card; see Download CSV or Excel Data.

FieldDescription
Stream Download LimitThe maximum number of records that a user can download from a stream view or card view on this stream. If no value is set, PhixFlow uses the default limit set in System Configuration→ System Tuning → Default Stream View Download Limit.
Allow Unlimited Downloads

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 to restrict all users to the Stream Download Limit.

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to display a User Groups section. Specify user groups whose members can download unlimited data from a stream view or card view on this stream. For example, members of the Administrators user group may need to download all data.

User Groups

Available when Allow Unlimited Downloads is ticked.

Use this section to select the user groups whose members can download an unlimited number of records.

This section has a toolbar with standard buttons and 

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The grid contains a list of user groups that are exempt from the Stream Download Limit. To add a user group to the list:

  1. Click
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     to list all the user groups in the repository.
  2. Drag user groups into this list to add them to the role. 

To remove user groups, use the

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 in the toolbar.

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Store Stream Views

To do

Access Permissions

By default, the permissions to access stream data is set in System Configuration →  Allow access to data by default. You can add specific user groups to restrict access to the stream; see Common Properties → Access Permissions.

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FieldDescription
Advanced PropertiesOnly use this field with advice from PhixFlow support. 
Database View

Use this option if your database administrator wants to query stream data in the PhixFlow database. Enter a string in the format v_xxxx. When the stream is published to the database, PhixFlow creates a  stream view. 

By default, this field is blank and no stream view is created in the database.

If the stream is deleted, the next system task that runs will clear the associated stream view from the database.

Storage Options
Index Scheme 
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This determines how indexes on the Stream are organised. 
  • All: indexes on the Stream are optimised for selecting from all stream sets (non-historied reads).
  • Latest: indexes on the Stream are optimised for selecting from the latest stream set (i.e. for historied reads).
  • Superseded: indexes on the Stream are optimised for self-updating streams which have a mostly superseded records.
  • None: no indexes are created on the Stream.
Storage TypeSpecifies how data for the Stream should be stored:
  • Database: Store the data in a regular table within the PhixFlow database. This is the most common option
  • Database (Partitioned): Store the data in a partitioned table within the PhixFlow database. This option provides improved performance for rollback and archiving of very large Streamsets. The option is only available if "partitioning" is available within your database installation.
  • In Memory: Data for the Stream will not be written to the database. This option can be used (for example) when you want to aggregate large amounts of unsorted data which can then be written to a stored Stream.
Data Generation Options
Start DateThe date that this stream starts. Data will be populated into the stream from this date onwards.
In Memory Cache SizeThe size of the cache that will be maintained when you are using an in-memory stream. See How To: Summarise unsorted data with In Memory Streams.
Allow Partial Set ProcessingIf ticked, when analysis reaches the end of a buffer block it submits the candidate set for processing, even if the next buffer block has a different key.
Prevent Parallel Processing

This field only appears if the Period is set to Transactional. If ticked, it ensures that only a single stream set can be generated at a time even if the stream receives several concurrent requests to generate data.

This can be useful where you want to make sure that two analysis runs don't attempt to update the same records at the same time e.g. as a result of two people selecting the same records in a view and then hitting the same action button at the same time to process those records.

Run Alone

If this flag is ticked then whenever the analysis engine needs to generate data for this stream it will first wait for all running tasks to complete before it starts.

Any additional analysis tasks submitted while this stream is waiting to start, or while it is generating data, will wait until this stream has completed its analysis before they start.

Key TolerancesWhen building a candidate set, data can be grouped together using a specific key value, e.g. Account Number. If the key value is a number, setting a key tolerance will identify numbers within the given tolerance as the the same key value.
Write in Single TransactionIf this is ticked, all of the records for a Stream Set will be written to the database in a single transaction.
Maximum Records to WriteThe maximum number of records per Stream Set if Write in Single Transaction is ticked.
Default ViewThe default view selected for the stream. See help on Views for details of creating views on streams.
Last Run Date (Read only)The date and time that analysis was last run for this stream. This date is taken from the "to date" of the most recent stream set for this stream.
Last Run ByThe user that last ran this stream.

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