INSERT INTO ... SELECT is Slow Using 4K Block Size When Maximum Row Length Exceeds the Block Size
Last updated on SEPTEMBER 19, 2016
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Information in this document applies to any platform.
INSERT INTO ... SELECT command is slow with a 4K block size when compared to an 8K block size.
Elapsed time is longer with increased db block gets , redo size and CPU usage
For example :
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