Base table deletion suggestion of the rqd questioned

Hai

I have 10 million record in the table.

table has no index.

When I run the command "Select * from table" takes a lot of time.

My question is when to delete all records except a record and committed. now when I run the same command "" select * from table ' "

Now, as it takes a long time... ?

Why?

Please give more suggestions

S

Because Oracle scans all the blocks in this table / segment.
Many of these blocks are empty, but Oracle still to be scanned.

If you truncate the table (without the RE-USE of STORAGE clause), then Oracle have reset the high water mark for this table / segment, and not need to analyze all those empty blocks more.

Tags: Database

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