 Related Questions Data Modelling is Broadly classified into 2 types. a) E-R Diagrams (Entity - Relatioships). b) Dimensional Modelling. Latest Answer : Dimension modelling means to define a datawarehouse architecture using any one of the availabale schemadimensionl modelling are 3 types 1. conceptual model 2. logical model3.physical modelconceptual model: gathering of all the requirementslogical ... a)Star Schema - Simple & Much Faster. Denormalized form. b)Snowflake Schema - Complex with more Granularity. More normalized form. Latest Answer : Is not star schema better performance wise (querying) as it has less no of join due to denormalized structure? Please clarify ... Surrogate Key is a Primary Key for a Dimension table. Most importance of using it is it is independent of underlying database. i.e Surrogate Key is not affected by the changes going on with a database. Latest Answer : Primary Key does not allow data duplications for actual source data. We cannot maintain historical data of each record using PK.SID acts as a primary key in target WH systems, that allows data duplications and maintains complete historical data along ... Data in a Database is a) Detailed or Transactional b) Both Readable and Writable. c) Current. Latest Answer : Database data is in the form of OLTP and Data warehouse data will be in the form of OLAP. OLTP is for transactional process and OLAP is for Analysis purpose. ... Fact table - Table with Collection of Foreign Keys corresponding to the Primary Keys in Dimensional table. Consists of fields with numeric values. Dimension table - Table with Unique Primary Key. Load Latest Answer : __________________ _______________ ________________|_________________| |______________ ... Orchestrate itself is an ETL tool with extensive parallel processing capabilities and running on UNIX platform. Datastage used Orchestrate with Datastage XE (Beta version of 6.0) to incorporate the parallel Primary Key is a combination of unique and not null. It can be a collection of key values called as composite primary key. Partition Key is a just a part of Primary Key. There are several methods of partition Latest Answer : Hi:Primary key is the key we define on the table column or set of columns(composite pk) to make sure all the rows in a table are unique.Partition key is the key that we use while partition the table(in database), process the source records in ETL(in the ... Using "dsjob" command as follows. dsjob -run -jobstatus projectname jobname Latest Answer : u can use dsjob executable command from unix or command line.The previous post was correct.Hanu. ... Stage Variable - An intermediate processing variable that retains value during read and doesnt pass the value into target column. Derivation - Expression that specifies value to be passed on to the target Latest Answer : all r correct one only ... Default cache size is 256 MB. We can incraese it by going into Datastage Administrator and selecting the Tunable Tab and specify the cache size over there. Latest Answer : The default cache size is 128 MB. This is primarily used for hash file data cache in the server. This setting is only can be done in Administrator not in job level. Job level tuning is available only for Buffer Size. ...
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