- ETL SAS INTERVIEW QUESTIONS UPDATE
- ETL SAS INTERVIEW QUESTIONS FULL
It comes with a conformed dimension along with a standardized definition of informationĪ data source view defines the relational schema which will be used in the analysis services databases. For flat files Static cache is usedįor the various business processes to identify the common dimensions, BUS schema is used.
ETL SAS INTERVIEW QUESTIONS UPDATE
In what case do you use dynamic cache and static cache in connected and unconnected transformations?ĭynamic cache is used when you have to update master table and slowly changing dimensions (SCD). In case if you have non-OLEBD source for the lookup then you have to use Cache to load data and use it as source In case you have non-OLEDB (Object Linking and Embedding Database) source for the lookup what would you do?. ETL SAS INTERVIEW QUESTIONS FULL
Use full database name for updating if MSSQL is used.To update table using SSIS the possible ways are:
Using SSIS (SQL Server Integration Service) what are the possible ways to update table?. The advantage of using the Data Reader Destination Adapter is that it populates an ADO record set in memory and exposes the data from the Data Flow task by implementing the Data Reader interface, so that other application can consume the data. Mention what is the advantage of using Data Reader Destination Adapter?. Verify whether records already exist in the table. Getting a related value from a table using a column value. Explain the use of Lookup Transformation?. The numeric data is based on columns in a fact table is called as MeasuresĪ transformation is a repository object which produces, modifies or passes data. For example, it is used to record an event such as employee count in a company. It can view the number of occurring events. Explain what fact less fact schema is and what is Measures?Ī fact table without measures is known as Fact less fact table. 
Normal level describes the tracing level in a comprehensive manner while verbose explains the tracing levels at each and every row. Tracing level can be classified in two types Normal and Verbose. Tracing level is the amount of data placed in the log files. Explain what is tracing level and what are the types?.It consists of facts called as measures categorized by dimensions. OLAP stands for Online Analytics Processing, and OLAP cube stores large data in multi-dimensional form for reporting purposes. Facts are related to dimensions.Ĭubes are data handling units included of fact tables and dimensions from the data warehouse. What is fact? What are the types of facts?įact is a central component of a multi-dimensional model which contains the measures to be examined.
Data warehousing is the way of aggregating data from multiple sources into one common repository. The types of data warehouse applications are:ĭata mining can be define as the process of extracting hidden predictive information from huge databases and interpret the data while data warehousing may make use of a data mine for analytical processing of the data in a faster way.
Mention what are the types of data warehouse applications and what is the difference between data mining and data warehousing?. The data is extracted from the source database in the extraction process which is then transformed into the required format and then loaded to the sink data warehouse. In this process, there are 3 different processes like E for Extract the data, T for Transform the data and L for Load the data. ETL is the process of transferring data from source database to the sink data warehouse.
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