Temporary Tablespace and transactions

Question

Hi.
I have a query regarding temp tablespace ,
I am on 10gR2 version. with ONE TEMP tablespace and having one tempfiles.
temp Tablespace TEMP1 = temp01.dbf (1 GB)
+ Let say I have executed a query-1 from Scott user , its runs for 30 min and let assume its consumed 900MB of tempspace during its completion .
+ And another query -2 from scott or another user fired ( let say Query 1 started earlier than Query 2 ) . and it needs around 500MB of tempspace
== MY Question is
Q .1 ) Will the Second Query waits until Query 1 completion ? As we have only one Temp file over here . IF both started executing both Queries will hit unable o extend temp space error .
- Please provide your inputs and corrections.
-Thanks.

Answer 1

TEMP Tablespace size : 1GB NO AutoExtend
First Query uses 900MB
Second Query starts using space and will eventually need 500MB space
Both queries will concurrently be allowed to use Temp Space
If the first query completes before the second query usage hits 100MB, it will release all 900MB for usage by the second query.
If the first query hasn't completed and is at 900MB, the second query will error out when it attempts to go beyond 100MB.
If the first query needs more than 900MB and the second query has used 100MB -- i.e. both are growing in usage -- any one of the two queries wil fail.
NOTE : If Resumable Space Allocation has been enabled either by setting RESUMABLE_TIMEOUT or by ALTER SESSION ENABLE RESUMABLE, the queries will not fail if the TEMP Tablespace is resized within the timeout period. Else, beyond the timeout, either of the queries will fail.
Hemant K Chitale
Edited by: Hemant K Chitale on Feb 13, 2013 4:17 PM
Added Note on Resumable Space Allocation