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What is Export Import in Oracle?
Export and Import are the Oracle utilities that allow us to make exports & imports of the data objects, and transfer the data across databases that reside on different hardware platforms on different Oracle versions. Export (exp) and import (imp) utilities are used to perform logical database backup and recovery.
Which modes are valid while exporting data using export and import utility?
The Export utility provides three modes of export. All users can export in table mode and user mode. A user with the EXP_FULL_DATABASE role (a privileged user) can export in table mode, user mode, and full database mode. The database objects that are exported depend on the mode you choose.
What is difference between Expdp and EXP?
What is the difference between normal exp/imp and datapump expdp/impdp? Datapump is a server side utility whereas export/import is a user process. datapump processes running on the server have direct access to the datafiles and the SGA. They don’t have to go via session.
Why does import take so long in Oracle?
You shutdown, change the parameter, start up and PRAY your database doesn’t shutdown abnormally. If it does, database is DEAD. If you are lucky and that doesn’t happen, you just import – and it will take *just as long* as if you didn’t set this parameter.
When to use Export / Import feature in Oracle?
You seem to follow your team’s advice blindly than the advice of a senior technical architect of Oracle Corporation. You can use the old export/import feature in release 10.2.0.4, and assuming you are importing data into a dev/qa environment it should be ok to put those databases in no archive log mode during the import.
How to parallelize export and import in Oracle?
You would export into MANY files (you would run export MANY times against the source data – perhaps at the schema level, creating a separate file per schema) so that you can import in parallel – yourself – and maximize the use of the machine. Or, just go to data pump which can parallelize the operations for you out of the box.
Why does data pump import take so long?
If the timezone version used by the export database is older than the version used by the import database, then loading columns with data type TIMESTAMP WITH TIMEZONE takes longer than it would otherwise. This additional time is required because the database must check to determine if the new timezone rules change the values being loaded.