What is use of INDEXFILE option in imp?
Will write DDLs of the objects in the dumpfile into the specified file.
What is use of IGNORE option in imp?
Will ignore the errors during import and will continue the import.
What are the differences between expdp and exp (Data Pump or normal exp/imp)?
Data Pump is server centric (files will be at server).
Data Pump has APIs, from procedures we can run Data Pump jobs.
In Data Pump, we can stop and restart the jobs.
Data Pump will do parallel execution.
Tapes & pipes are not supported in Data Pump.
Data Pump consumes more undo tablespace.
Data Pump import will create the user, if user doesn’t exist.
Why expdp is faster than exp (or) why Data Pump is faster than conventional export/import?
Data Pump is block mode, exp is byte mode.
Data Pump will do parallel execution.
Data Pump uses direct path API.
How to improve expdp performance?
Using parallel option which increases worker threads. This should be set based on the number of cpus.
How to improve impdp performance?
Using parallel option which increases worker threads. This should be set based on the number of cpus.
In Data Pump, where the jobs info will be stored (or) if you restart a job in Data Pump, how it will know from where to resume?
Whenever Data Pump export or import is running, Oracle will create a table with the JOB_NAME and will be deleted once the job is done. From this table, Oracle will find out how much job has completed and from where to continue etc.
Default export job name will be SYS_EXPORT_XXXX_01, where XXXX can be FULL or SCHEMA or TABLE.
Default import job name will be SYS_IMPORT_XXXX_01, where XXXX can be FULL or SCHEMA or TABLE.
What is the order of importing objects in impdp?
Tablespaces
Users
Roles
Database links
Sequences
Directories
Synonyms
Types
Tables/Partitions
Views
Comments
Packages/Procedures/Functions
Materialized views
How to import only metadata?
CONTENT= METADATA_ONLY
How to import into different user/tablespace/datafile/table?
REMAP_SCHEMA
REMAP_TABLESPACE
REMAP_DATAFILE
REMAP_TABLE
REMAP_DATA
