Answer / sreemanth reddy

hi
You can not specify a tablespace with global temporary
tables. GTT's are built in the TEMP tablespace.
Global temporary tables have three major benefits:

1. Non-interference between private sets of data.

2. Ease of getting rid of 'scratch' data. In a heap table
you either rollback, or delete it. But in a GTT, you can
truncate explicitly, without affecting anyone else (or allow
the implicit "truncate on commit / exit" effect to do
the same thing).

3. Decreased redo generation as, by definition, they are
non-logging.

However:

Mixing temporary tables (GTTs) with permanent tables usually
causes some grief to the CBO. It has no information
about the number of rows in the GTT, and therefore guesses
(badly).

Even if you analyze table .. or
dbms_stats.gather_table_stats() you don't get stats on the
temporary table.

Set the init parameter dynamic_sampling to at least 2 for
GTTs to be sampled at run-time.

Note: All DDL includes two implicit commits so any rows in a
GTT specified with ON COMMIT DELETE ROWS will empty the
table.

What is the difference between UNIQUE KEY and UNIQUE INDEX?

3 Answers   TCS,

---

How does postgresql compare to "nosql"?

0 Answers  

---

What sql database should I use?

0 Answers  

---

What are the different ddl commands in sql?

0 Answers  

---

How many levels can subqueries be nested in a FROM clause?

7 Answers  

---

what are date and time data types? : Sql dba

0 Answers  

---

Which one of the following join types will always create a Cartesian Product? 1. CROSS JOIN 2. LEFT OUTER JOIN 3. RIGHT OUTER JOIN 4. FULL OUTER JOIN 5. INNER JOIN

2 Answers  

---

How do you delete duplicates in sql query using rowid?

0 Answers  

---

Is t sql a programming language?

0 Answers  

---

what are the different type of normalization? : Sql dba

0 Answers  

---

What are the benefits of pl/sql packages?

0 Answers  

---

What does count (*) do in sql?

0 Answers  

---