The fastest way to load data

Option 1:

Insert the statement with:

table view: NOLOGGING

insert mode: APPEND

in ARCHIVELOG mode: noarchive log mode

Option 2:

DEC in NOLOGGING mode

The two options above would generate no redo log. What is the best for performance? I'm loading large or lines (a few million) on a daily basis and it is an intermediate table, so there is no problem when the reprocessing failure.

The answer may depend on the availability of memory and index.

ETG requires you to create indexes subsequently - but each index requires an analysis of the table.

Insert / * + append * / can optimize for indexes by capturing the values of the columns needed as data is loaded, and then creating the index without having to re-read the table.

Concerning

Jonathan Lewis

Tags: Database

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