Informatica Interview Question and Answers

61. How does the recovery mode work in informatica?
  In case of load failure an entry is made in OPB_SERV_ENTRY(?) table from where the extent of loading can be determined.
 
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62. What is Aggregate Awareness?
  Aggregate awareness is a feature of DESIGNER that makes use of aggregate tables in a database. These are tables that contain pre-calculated data. The purpose of these tables is to enhance the performance of SQL transactions; they are thus used to speed up the execution of queries.
 
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63. What is a difference between OLTP and OLAP?
 
    OLTP
  • It focus on day to day transaction.
  • Data Stability
  • Dynamic
  • Highly normalized.
  • Access Frequency High.
    OLAP
  • It focus on future predictions and decisions
  • Static until refreshed
  • Demoralized and replicated data
  • Medium to low.
 
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64. When should you use a star schema and when a snowflake schema?
  A star schema is a simplest data warehouse schema. Snowflake schema is similar to the star schema. It normalizes dimension table to save data storage space. It can be used to represent hierarchies of information.
 
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65. What parameters can be tweaked to get better performance from a session?
  DTM shared memory, Index cache memory, Data cache memory, by indexing, using persistent cache, increasing commit interval etc.
 
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