Maximum no of tables allowed ...

How many Tables we can use in a join in Oracle 9i
thanx in advance
George Bose

I don't know ... At least it is not documented as a logical database limit.
The Reference document only says about SQL subqueries:
Maximum levels of subqueries in a SQL statement:
- Unlimited in the FROM clause of the top-level query
- 255 subqueries in the WHERE clause
and
The limit on how long a SQL statement can be depends on many factors, including database configuration, disk space, and memory

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Maximum Number of Columns Allowed in OBIEE Answers Table View?

Was wondering if anyone knew the maximum number of columns allowed in OBIEE Answers Table View? I could not find it in documentation.
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Hi,
You can increase the maximum columns in a view by add some tags to instanceconfig.xml file.
check this...http://obiee101.blogspot.com/2008/02/obiee-controling-pivot-view-behavior.html
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Edited by: Srikanth Mandadi on Oct 15, 2010 10:04 AM

Maximum number of columns allowed in a table (in oracle 9i)

Maximum number of columns allowed in a table (in oracle 9i)

Assuming you are referring to 9iR2,
http://download.oracle.com/docs/cd/B10501_01/server.920/a96536/ch44.htm#288033

Maximum number of partitions allowed per table.

Interesting findings with interval partitioning:
SQL> SELECT *
2    FROM v$version
3 /
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> DROP TABLE tbl PURGE
2 /
Table dropped.
SQL> CREATE TABLE tbl(
2                   id number(6),
3                   dt date
4                  )
5    PARTITION BY RANGE(dt)
6      INTERVAL (INTERVAL '1' DAY)
7      (
8       PARTITION p1 VALUES LESS THAN (date '-857-12-31')
9      )
10 /
Table created.
SQL> select partition_name,
2          high_value
3    from user_tab_partitions
4    where table_name = 'TBL'
5 /
PARTITION_NAME HIGH_VALUE
P1             TO_DATE('-0857-12-31 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'N
               LS_CALENDAR=GREGORIAN')
SQL> INSERT
2    INTO tbl
3    VALUES(
4           1,
5           sysdate
6          )
7 /
1 row created.
SQL> DROP TABLE tbl PURGE
2 /
Table dropped.
SQL> CREATE TABLE tbl(
2                   id number(6),
3                   dt date
4                  )
5    PARTITION BY RANGE(dt)
6      INTERVAL (INTERVAL '1' DAY)
7      (
8       PARTITION p1 VALUES LESS THAN (date '-858-01-01')
9      )
10 /
Table created.
SQL> select partition_name,
2          high_value
3    from user_tab_partitions
4    where table_name = 'TBL'
5 /
PARTITION_NAME HIGH_VALUE
P1             TO_DATE('-0858-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'N
               LS_CALENDAR=GREGORIAN')
SQL> INSERT
2    INTO tbl
3    VALUES(
4           1,
5           sysdate
6          )
7 /
INTO tbl
ERROR at line 2:
ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions
SQL> From Logical Database Limits:
Maximum number of partitions allowed per table or index: 1024K - 1
I always thought limit implies to number of actual, not potential partitions, however it looks like I was wrong, although it makes not much sense to limit potential and not actual partitions:
SQL> select trunc(sysdate) - date '-858-01-01',
2          1024 * 1024 - 1
3    from dual
4 /
TRUNC(SYSDATE)-DATE'-858-01-01' 1024*1024-1
                        1048661     1048575
SQL> select to_char(DATE'-858-01-01' + 1048575,'MM/DD/YYYY')
2    from dual
3 /
TO_CHAR(DA
11/17/2012
SQL> So tomorrow "magic" date should increase by one day. I'll test it. But more interesting if tomorrow I will be able to insert a row that forms a new partition into table TBL.
SY.

rp0428 wrote:
The other argument is that Oracle has to be able to automatically create any partition required and it can only create 1024k - 1. So if you create yours with sysdate how could it create all of the others?Not sure I follow. What is the purpose of counting potential partitions? Partition part# iin sys.tabpart$ is not assigned based on potential partition position. If I issue a DDL to create new partition regardless of interval/non-interval partitioning Oracle has to check how many partitions table has so far or po and raise same/similar exception if partition I am asking to create is over the limit. And, in any case, knowing we can create all potential partitions at table create time doesn't mean I will not try to insert data outside the range. So there is absolutely no guarantee Oracle can automatically create any partition requested. Again, I don't understand why creating non-interval partitioned table with a single initial partition has partition count of 1:
SQL> DROP TABLE tbl1 PURGE
2 /
Table dropped.
SQL> CREATE TABLE tbl1(
2                    id number(6),
3                    dt date
4                   )
5    PARTITION BY RANGE(dt)
6      (
7       PARTITION p1 VALUES LESS THAN (date '-857-12-31')
8      )
9 /
Table created.
SQL> SELECT partition_count
2    FROM user_part_tables
3    WHERE table_name = 'TBL1'
4 /
PARTITION_COUNT
              1
SQL>And interval partitioned table with same single initial partition has partition count of 1048575:
SQL> CREATE TABLE tbl1(
2                    id number(6),
3                    dt date
4                   )
5    PARTITION BY RANGE(dt)
6      INTERVAL (INTERVAL '1' DAY)
7      (
8       PARTITION p1 VALUES LESS THAN (date '-857-12-31')
9      )
10 /
Table created.
SQL> SELECT partition_count
2    FROM user_part_tables
3    WHERE table_name = 'TBL1'
4 /
PARTITION_COUNT
        1048575
SQL> Would be interesting to find out what forces Oracle to go into potential partition mode for interval partitioning.
SY.

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Hi,
I am constructing SQL query dynamically in a stored proc. based on user inputs. I am getting following error when I have around 400 columns in my SELECT clause. FROM, WHERE, GROUP BY clauses are same eventhough I have 30 columns and I don't have any problems here. Can anyone please let me know what is maximum no. of columns allowed in a query. I am working on Oracle 9i Release2.
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Cheers, APC
Message was edited by:
APC

Maximum number of tables that can be outer joined with one table in a query

Hi All,
Iam new to sql, so can you please let me know What is the maximum number of tables that can be outer joined with one table in a query?
Thanks,
Srini

srinu2 wrote:
Iam new to sql, so can you please let me know What is the maximum number of tables that can be outer joined with one table in a query?
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SQL> with a as
2      (
3      select 1 id, 2 b_key, 3 c_key from dual union all
4      select 2 id, 1 b_key, 4 c_key from dual union all
5      select 3 id, 3 b_key, 1 c_key from dual union all
6      select 4 id, 4 b_key, 2 c_key from dual
7      ),
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9      (
10      select 1 id, 1 c_key2 from dual union all
11      select 2 id, 5 c_key2 from dual union all
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13      select 4 id, 2 c_key2 from dual
14      ),
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16      (
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24      select 2 key1, 4 key2, '2-4' dta from dual union all
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27      select 3 key1, 3 key2, '3-3' dta from dual union all
28      select 3 key1, 4 key2, '3-4' dta from dual union all
29      select 4 key1, 1 key2, '4-1' dta from dual union all
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31      select 4 key1, 3 key2, '4-3' dta from dual union all
32      select 4 key1, 4 key2, '4-4' dta from dual
33      )
34 select d.a_id, d.b_id, c.key1 as c_key1, c.key2 as c_key3, c.dta
35 from
36      c,
37      (
38      select
39          a.id as a_id, b.id as b_id, a.c_key, b.c_key2
40      from a, b
41      where a.b_key = b.id
42      ) d
43 where d.c_key = c.key1 (+)
44 and   d.c_key2 = c.key2 (+);
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         4          4          2          2 2-2
         2          1          4          1 4-1
         1          2
SQL>

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Anne
Message was edited by:
anne

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Maximum no of tables allowed ...

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