Reasons to use separate temp tablespace for user tablespace

Hi,
I know that guideline says is not use system tablespace for user tables. But need i create for user tablespace separate TEMP teblespace or i can use same TEMP tablespace for all tablespaces?

Hi,
>>But need i create for user tablespace separate TEMP tablespace or i can use same TEMP tablespace for all tablespaces?
You can use one temp tablespace for a database , Temp tablespace usage are for sorting the data.
for more detail you can go with  :Creating Tablespaces
HTH

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    It might be an uncommited, not rolled back statement, but what session is it ?
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    | Id  | Operation                                      | Name                        | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT                          |                             |    79 | 23384 |  1404   (1)| 00:00:17 |
    |   1 |  HASH UNIQUE                                   |                             |    79 | 23384 |  1404   (1)| 00:00:17 |
    |*  2 |   TABLE ACCESS BY INDEX ROWID        | ODS_TRANS_ITEM       |     1 |    53 |     4   (0)| 00:00:01 |
    |   3 |    NESTED LOOPS                                |                             |    79 | 23384 |  1403   (1)| 00:00:17 |
    |   4 |     NESTED LOOPS OUTER                    |                             |    73 | 17739 |  1144   (1)| 00:00:14 |
    |   5 |      NESTED LOOPS                              |                             |    73 | 16717 |   965   (0)| 00:00:12 |
    |   6 |       NESTED LOOPS                             |                             |    73 | 15476 |   819   (0)| 00:00:10 |
    |   7 |        NESTED LOOPS                            |                             |    73 | 14089 |   673   (0)| 00:00:09 |
    |   8 |         NESTED LOOPS                           |                             |    73 | 10439 |   672   (0)| 00:00:09 |
    |   9 |          NESTED LOOPS                          |                             |    90 |  9810 |   312   (0)| 00:00:04 |
    |* 10 |           TABLE ACCESS BY INDEX ROWID| ODS_TRANS_ALT_ID            |    92 |  3680 |    52   (0)| 00:00:01 |
    |* 11 |            INDEX RANGE SCAN               | ODS_TRANS_ALT_ID_X1         |   119 |       |     5   (0)| 00:00:01 |
    |  12 |           TABLE ACCESS BY INDEX ROWID| ODS_TRANS                   |     1 |    69 |     3   (0)| 00:00:01 |
    |* 13 |            INDEX UNIQUE SCAN              | ODS_TRANS_PK                |     1 |       |     2   (0)| 00:00:01 |
    |  14 |          TABLE ACCESS BY INDEX ROWID | ODS_TRANS_EVENT             |     1 |    34 |     4   (0)| 00:00:01 |
    |* 15 |           INDEX RANGE SCAN                | ODS_TRANS_EVENT_PK          |     1 |       |     3   (0)| 00:00:01 |
    |  16 |         TABLE ACCESS BY INDEX ROWID  | ODS_TRANS_EVENT_TYPE_REF    |     1 |    50 |     1   (0)| 00:00:01 |
    |* 17 |          INDEX UNIQUE SCAN                | ODS_TRANS_EVENT_TYPE_REF_PK |     1 |       |     0   (0)| 00:00:01 |
    |  18 |        TABLE ACCESS BY INDEX ROWID   | ODS_PRODUCT_ALT_ID          |     1 |    19 |     2   (0)| 00:00:01 |
    |* 19 |         INDEX RANGE SCAN                  | ODS_PRODUCT_ALT_ID_PK       |     1 |       |     1   (0)| 00:00:01 |
    |* 20 |       TABLE ACCESS BY INDEX ROWID    | ODS_CUST_ACCT_ALT_ID        |     1 |    17 |     2   (0)| 00:00:01 |
    |* 21 |        INDEX RANGE SCAN                   | ODS_CUST_ACCT_ALT_ID_PK     |     1 |       |     1   (0)| 00:00:01 |
    |  22 |      TABLE ACCESS BY INDEX ROWID     | ODS_TRANS_EXTNN             |     1 |    14 |     3   (0)| 00:00:01 |
    |* 23 |       INDEX UNIQUE SCAN                   | SYS_C0026927                |     1 |       |     2   (0)| 00:00:01 |
    |* 24 |     INDEX RANGE SCAN                      | ODS_TRANS_ITEM_PK           |     1 |       |     3   (0)| 00:00:01 |
    --------------------------------------------------------------------------------------------------------------------Cant avoid the order by and distinct clauses. Cant avoid Outer joins. Indexes are used properly.

    Just to add on to Mark's excellent points--
    1) The Oracle optimizer is estimating that your query is only going to return 79 rows. If it is using a great deal of TEMP space, that estimate would seem to be wildly incorrect which implies that you have a problem with your statistics.
    2) Are you certain that you need the DISTINCT? Lots of people either throw DISTINCT clauses into their queries "just in case" or throw in a distinct when they are unexpectedly getting duplicate rows because they are missing a join condition. If that's the case here, removing the DISTINCT and figuring out which join condition is missing (if applicable) would cause much less TEMP space to be used.
    Justin

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  • TEMP tablespace increasing

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