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06-Aug-2016 17:24

Lookups are a concept in Druid where dimension values are (optionally) replaced with new values. For the purpose of these documents, a "key" refers to a dimension value to match, and a "value" refers to its replacement. It is worth noting that lookups support use cases where keys map to unique values (injective) such as a country code and a country name, and also supports use cases where multiple IDs map to the same value, e.g. This means that if the chief account manager for a particular app-id changes, and you issue a query with a lookup to store the app-id to account manager relationship, it will return the current account manager for that app-id REGARDLESS of the time range over which you query.

multiple app-ids belonging to a single account manager. If you require data time range sensitive lookups, such a use case is not currently supported dynamically at query time, and such data belongs in the raw denormalized data for use in Druid.

Power Center 8 is Informatica's enterprise data integration platform that serves as the foundation for all data integration projects.

Power Center 8 is a scalable, platform independent product, capable of reading from and writing to virtually any data source.

Metadata is stored in a global metadata repository, enabling data lineage functionality.

This output port GET_SK can be connected to the target surrogate key column.

Dynamic partitioning allows for data to load in concurrent data streams.

Power Center 8 supports high availability, grid-computing and has extensive failover options.

The Lookup transformation returns the result of the lookup to the target or another transformation. We can configure the Lookup transformation to one of the following types of lookups: 1. a) We can override the default SQL statement if we want to add a WHERE clause or query multiple tables. When you create a Lookup transformation, you can create the lookup source from the following locations: - Relational source or target definition in the repository - Flat file source or target definition in the repository - Table or file that the Integration Service and Power Center Client machine can connect to - Source qualifier definition in a mapping 2. Lookup Properties Configure the lookup properties such as caching and multiple matches on the Lookup Properties tab. Lookup Condition The Integration Service finds data in the lookup source with a lookup condition.

You can configure the Lookup transformation to return a single row or multiple rows. Get a related value : Retrieve a value from the lookup table based on a value in the source. b) We can use a dynamic lookup cache with relational lookups. Flat File Lookup: When we use a flat file for a lookup source, we can use any flat file definition in the repository, or we can import it. Pipeline Lookup : When we use SAP application as lookup source in that case we use pipeline lookup. Configure the lookup condition or the SQL statements to query the lookup table. The lookup condition is similar to the WHERE clause in an SQL query.

This output port GET_SK can be connected to the target surrogate key column.

Dynamic partitioning allows for data to load in concurrent data streams.

Power Center 8 supports high availability, grid-computing and has extensive failover options.

The Lookup transformation returns the result of the lookup to the target or another transformation. We can configure the Lookup transformation to one of the following types of lookups: 1. a) We can override the default SQL statement if we want to add a WHERE clause or query multiple tables. When you create a Lookup transformation, you can create the lookup source from the following locations: - Relational source or target definition in the repository - Flat file source or target definition in the repository - Table or file that the Integration Service and Power Center Client machine can connect to - Source qualifier definition in a mapping 2. Lookup Properties Configure the lookup properties such as caching and multiple matches on the Lookup Properties tab. Lookup Condition The Integration Service finds data in the lookup source with a lookup condition.

You can configure the Lookup transformation to return a single row or multiple rows. Get a related value : Retrieve a value from the lookup table based on a value in the source. b) We can use a dynamic lookup cache with relational lookups. Flat File Lookup: When we use a flat file for a lookup source, we can use any flat file definition in the repository, or we can import it. Pipeline Lookup : When we use SAP application as lookup source in that case we use pipeline lookup. Configure the lookup condition or the SQL statements to query the lookup table. The lookup condition is similar to the WHERE clause in an SQL query.

The lookup source table contains employee_ID,first_name, and last_name.