Why should we the HWM?

Jin

Why should we the HWM? He used the CBO? I mean, if we do a FTS, then the first block not formatted, we achieved a MSSM tells us above all blocks are not formatted, so we read more, then what is the use of the HWM?

Thank you

OracleGuy777 wrote:
Jin

Why should we the HWM? He used the CBO? I mean, if we do a FTS, then the first block not formatted, we achieved a MSSM tells us above all blocks are not formatted, so we read more, then what is the use of the HWM?

(1) why you assume that HWM is there FOR FTS? (implied by the question) I think that FTS use HWM because it exists.

(2) are all 'unused blocks' not formatted? This means that something unformats 'blocks' when you drop a table?

(3) what happens when you truncate a table?

(4) my thought is that HWM is more to provide a starting position for Direct Path insert what else.

Tags: Database

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