CacheMetadata
Determines whether the provider caches table metadata to a file-based cache database.
Data Type
bool
Default Value
false
Remarks
When this connection property is set to True, as you execute queries, table metadata in the Tableau CRM catalog is cached to the cache database specified by CacheConnection and CacheDriver, or, if those connection properties are not set, to the user's home directory.
The location of your home directory varies by platform:
Platform | Home Directory |
Windows | %APPDATA%\\CData\\TableauCRM Data Provider |
Mac | ~/Library/Application Support/CData/TableauCRM Data Provider |
Unix | ~/.config/CData/TableauCRM Data Provider |
When to Use CacheMetadata
When there are a large number of Tableau CRM tables and columns for the connector to retrieve during metadata discovery, the connector may take a while to list all table metadata.
You may experience slow metadata retrieval when:
- Your Tableau CRM instance naturally has a large table count.
- The connector has been configured, via its connection properties, to discover more tables than it would under its default configuration.
- You make many short-lived connections to the connector.
When Not to Use CacheMetadata
The connector automatically persists metadata in memory for up to an hour when you first discover the metadata for a table or view, so CacheMetadata is generally not necessary.
CacheMetadata is not ideal in scenarios where you are working with volatile metadata. The first time you query a table, the connector caches its metadata to the cache database file. This cache is not dynamically updated to reflect updates to the table schema, so you must delete and rebuild the cache database file to pick up new, changed, or deleted columns.