Problem with SQL to create a temp table to evaluate sort merge join

Can anyone help me with the below sql to enable the performance of the use merge join to be evaluated. This sql is placed in a file and ran from the prompt.
timing start
CREATE table testsql as
SELECT /*+ USE_MERGE(t1000 t8000)*/ t1000, t8000
FROM t1000, t8000
WHERE t1000.ONEPERCENT=1 AND t1000.unique1 = t8000.fk;
timing stop
drop table testsql;
Current error message:
SQL> start h:\exe1.sql
SELECT /*+ USE_MERGE(t1000 t8000)*/ t1000, t8000
ERROR at line 2:
ORA-00904: "T8000": invalid identifier
Elapsed: 00:00:00.01
drop table testsql
ERROR at line 1:
ORA-00942: table or view does not exist
Thanks for your help,
Regards, Chris.

SELECT /*+ USE_MERGE(t1000 t8000)*/ t1000, t8000
Are you sure you have columns t1000 and t8000 in one of your tables used in the from clause?
What is the idea of this exercise? what is it that you are trying to evaluate?

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PL/SQL to create a temp table that will be dropped after session ends

Is it possible in PL/SQL to create a temp table that will be dropped after the session ends? Please provide example if possible. I can create a global temp table in PL/SQL but I am not sure how (if possible) to have it 'drop' once the session ends.
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:-)

As others have mentioned (but probably not clearly explained), Oracle treats temporary tables differently to SQL Server.
In SQL Server you create a temporary table and it gets dropped (automatically I assume, I dont do SQL Server) after the session finishes. This will obviously allow each session to "request" a temporary table to use, then use it, and not have to worry about cleaning up the database after the session has finished.
Oracle takes a different approach...
On the assumption that each session is likely to be creating a temporary table for the same purposes, with the same structure, Oracle let's you create a Global Temporary Table a.k.a. GTT (which you've already come across). You only have to create this table once and you leave it on the database. This then means that any code written to use that table doesn't have to be dynamic code and can be verified and checked at compile time, just like code written for any other table. The difference of a GTT from a regular table is that any data you put into that table can only be seen by that session and will not interfere with any data of other sessions and, when you either commit, or end the session (depending on the "on commit delete rows" or "on commit preserve rows" option used when creating the GTT), that data from your own session will automatically be removed and hence the table is cleaned up that way, whilst the actual table itself remains.
Some people from SQL Server backgrounds try and create and drop tables dynamically in their PL/SQL code, but this leads to problems...
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Wrote file afiedt.buf
1 begin
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3    insert into my_temp values (1);
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insert into my_temp values (1);
ERROR at line 3:
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ORA-06550: line 3, column 3:
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They then try and get around this issue by making their DML statements dynamic too...
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure my_proc is
2 begin
3    execute immediate 'create table my_temp (x number)';
4    execute immediate 'insert into my_temp values (''A'')';
5    execute immediate 'drop table my_temp';
6* end;
SQL> /
Procedure created.... which looks great and it compiles ok... but... when they try and run it...
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BEGIN my_proc; END;
ERROR at line 1:
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ORA-06512: at "SCOTT.MY_PROC", line 4
ORA-06512: at line 1... oops the code has a bug in it. Our DML statement was invalid.
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How to create a temp table in the memory, not in disk?

in sql server, you can create a temp table in the memory instead of disk,
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Thanks for rectifying me Howard.
I just read your full article on this too and its very well explained here:
http://www.dizwell.com/prod/node/357
Few lines from your article
It is true, of course, that since Version 8.0 Oracle has provided the ability to create a Keep Pool in the Buffer Cache, which certainly sounds like it can do the job... especially since that word 'keep' is used again. But a keep pool is merely a segregated part of the buffer cache, into which you direct blocks from particular tables (by creating them, or altering them, with the BUFFER POOL KEEP clause). So you can tuck the blocks from such tables out of the way, into their own part of the buffer cache... but that is not the same thing as guaranteeing they'll stay there. If you over-populate the Keep Pool, then its LRU mechanism will kick in and age its contents out just as efficiently as an unsegregated buffer cache would.
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Hi,
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