when load type is selected as bulk or normal in session level ?let me know the internal process and give me an example?
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Answer / sandeep desai
when session scheduled then load type is bulk mode at that time integration service bypass the database log file..it not create it and you cannot rollback the data
but in normal mode integration service create database log file and u can rollback the data
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For History Load, generally the data is bulk loaded because the cost of indexes on the table is skipped when bulk loading is done as indexes on the target table are not allowed for bulk load.Once the data is loaded then the indexes are created. This way we could load the data into the target much faster.Also bulk load would not write the rows in the roll back segment.The time taken to write into roll back segment is also saved.Hence performance improved.
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A:when you run a session with Normal load IS commits data into the target table as well as commits rowid into a log table.
For Example: you have 10000 records in your source,while loading data if your session fails at any point of time then there is a scope of recovery.After you fetch the issue when you rerun the job you need to ensure that your session is running with Normal load and instead of loading from the scratch,IS connect to the Repository service then Repo service connect to the Repo Database and check what is the last rowid commited in the log table and start loading from the max rowid+1 on wards.
checkpoint at session level: Resume From Last save heckpoint
BulkLoad: when you run a session with Bulk load the IS loads the data into target table and it won't commit any rowid into the log table. so performance will be good because only one operation is happing here but if session is failed at any point of time then there is no scope of recovery.
Note: when you work with Bulk load you need to ensure that there is no indexes on target table.if it has indexes your session get fails.
Q: I want to use bulk load and i have indexes on target table can't i access?
A: Yes you can achieve this by ensuring the option
Pre-SQL as :Drop Index index_Name;
Post-SQL as:create Index index_Name on table_Name(col_Name);
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