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Data Pool Visualization

PreviousIdentify Issues with Legacy ProjectsNextModel Ribbon

Last updated 4 years ago

The Data Pool Visualization is a page that shows the memory usage of the "Data Pool", the in memory data storage for ADVIZOR. The visualization is launched from the "Data Pool Visualization" button on the Project Workshop view:

A new tab is created, named "Data Pool", which looks like this:

The charts on the display give:

  • The Total Size of the Data Pool in bytes (Bar Chart).

  • Size by type of data (Bar Chart).

  • Detail on Data Pool object (Data Sheet).

  • Data Pool objects by type and size (Heat Map).

Data Pool Components

The components of the Data Pool displayed are:

  • Charts: working memory used by charts. Chart memory is only allocated when the page containing the chart is visited; untouched pages take no chart memory.

  • Tables: tables storing user data being visualized in the dashboard, shared by all charts

  • MetaTables: small tables used to store distinct string values used by fields. There is 1 MetaTable for each string field.

  • Strings: the collection of all distinct strings.

  • Session: undo state

  • VzData: overhead

  • Filters: storage for Text Filters.

  • Aggregation: tables created by Aggregation Links or by Summary Sheets

  • SelectionLinks: storage used to match tables connected by Selection Links.

  • Colors: storage of overall color information.

  • DataPool: overhead.

Uses

The Data Pool visualization can be used in these ways:

  • Use the "Total Size in Bytes" bar chart to find the overall size of the Data Pool.

  • Look for charts taking excessive memory. This is often from Bar Charts with too many categories. Consider replacing with Summary Sheet or eliminating.

  • Find the number of distinct strings in the data. If strings takes a large amount of memory, consider whether they need to be loaded.

  • Find unused fields.

Data Pool Object Fields

These fields are used to describe objects in the Data Pool:

  • Type: class of data

  • Name: instance name. For charts, the name is an internal name that is not externally visible; use the “Title” field to find the chart.

  • SizeBytes: memory used in bytes. The size of Fields is omitted and included in the table size.

  • Rows: Rows in the object for tables; for Strings, the number of distinct strings.

  • Fields: Number of fields for Tables.

  • References: Times the object is referenced. Tables and Fields are referenced by charts. A Field with a reference count of 1 is unused (it is always referenced by the Table it is in).

  • Title: visible title for a chart.

  • Sources: the source table.field for charts and links.

  • Sinks: the destination table.field for links.