#Database deadlock resilience feature in informatica update
For this, we need to define the key in the target table in Informatica level and then we need to connect the key and the field we want to update in the mapping Target. How can we update a record in target table without using Update strategy?Ī target table can be updated without using 'Update Strategy'. By default, Informatica cache is static cache.Ī lookup cache can also be divided as persistent or non-persistent based on whether Informatica retains the cache even after the completion of session run or deletes it On the other hand, A dynamic cache is refreshed during the session run by inserting or updating the records in cache based on the incoming source data. A static cache is one which does not modify the cache once it is built and it remains same during the session run. And Cached lookup can be either static or dynamic. Informatica Lookups can be cached or un-cached (No cache).
inside a source qualifier transformation, unless there is a chance that already sorted records from source qualifier can again become unsorted before reaching aggregator. It is often a good idea to sort the record set in database level e.g. The record set should be sorted on those columns that are used in Group By operation. What can we do to improve the performance of Informatica Aggregator Transformation?Īggregator performance improves dramatically if records are sorted before passing to the aggregator and "sorted input" option under aggregator properties is checked. If one record does not match filter condition, the record is blocked
If a certain record does not match any of the routing conditions, the record is routed to default groupįilter transformation does not have a default group. Router transformation itself does not block any record. Such groups can be mutually inclusive (Different groups may contain same record)įilter transformation restricts or blocks the incoming record set based on one given condition. Router transformation divides the incoming records into multiple groups based on some condition. What is the difference between Router and Filter? On the other hand a passive transformation is the one which does not change the number of rows that pass through it. Example: Filter transformation.Ģ) Change the transaction boundary by defining commit or rollback points., example transaction control transformation.ģ) Change the row type, example Update strategy is active because it flags the rows for insert, delete, update or reject. What is meant by active and passive transformation? An active transformation is the one that performs any of the following actions:ġ) Change the number of rows between transformation input and output. value to return when lookup conditions are not satisfied)ĭoes not support user defined default values Supports user-defined default values (i.e. Unconnected lookup caches only the lookup output ports in the lookup conditions and the return port output portĬonnected lookup caches all lookup columns Unconnected Lookup can return only one column value i.e. Unconnected Lookup cache can NOT be dynamicĬonnected lookup can return more than one column value ( output port )
Unconnected lookup receives input values from the result of a LKP: expression in another transformationĬonnected lookup can use both dynamic and static cache The differences are illustrated in the below tableĬonnected lookup participates in dataflow and receives input directly from the pipeline What are the differences between Connected and Unconnected Lookup?
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