Sundeep,
Major differences between AUTOALLOCATE and UNIFORM is the fact that extent
sizes in AUTOALLOCATE tablespace are not uniformly-sized.
I've been working in v9.0.1 (not 8.1.7 -- don't have one of those!) and
noticed the following pattern in non-partitioned tables and
range-partitioned tables:
first 16 extents = 64K (8 blocks of 8K apiece)
next 63 extents = 1M (128 blocks of 8K apiece)
next ? extents = 8M (1024 blocks of 8K apiece)
In my tablespaces, I haven't seen more than 16 extents of 64K for any
segment, and I haven't seen more than 63 extents of 1M for any segment. I
don't have any objects big enough (yet) to probe the upper reaches of the 8M
extent range...
These tables were loaded with conventional-path SQL*Loader, which appears to
be an important factor.
Because, for my composite-partitioned tables, I noticed that the
subpartitions do not follow this pattern at all. It could be due to the
nature of a HASH-partition or a COMPOSITE-partition, but I suspect that it
is due more to the fact that they were loaded with direct, parallel
SQL*Loader. The extent sizes follow a pattern that I, as a
non-mathematically-inclined person, cannot yet quantify. For those with the
same pattern-seeking mania exhibited by the character of John Nash in the
movie "A Beautiful Mind", here's a query of a single large subpartition:
EXTENT_ID BLOCKS
---------- ----------
0 8
1 8
2 8
3 8
4 8
5 8
6 8
7 8
8 8
9 8
10 8
11 8
12 8
13 8
14 8
15 8
16 128
17 128
18 128
19 24
20 8
21 8
22 8
23 8
24 8
25 8
26 8
27 8
28 8
29 8
30 8
31 8
32 8
33 8
34 8
35 8
36 128
37 128
38 96
39 8
40 8
41 8
42 8
43 8
44 8
45 8
46 8
47 8
48 8
49 8
50 8
51 8
52 8
53 8
54 8
55 128
56 128
57 128
58 128
59 48
60 8
61 8
62 8
63 8
64 8
65 8
66 8
67 8
68 8
69 8
70 8
71 8
72 8
73 8
74 8
75 8
76 128
77 128
78 128
79 64
80 8
81 8
82 8
83 8
84 8
85 8
86 8
87 8
88 8
89 8
90 8
91 8
92 8
93 8
94 8
95 8
96 128
97 128
98 128
99 128
100 64
101 8
Quite a few patterns leap to mind from this, but then I started seeing
trench-coated CIA operatives so I'm just going to leave it alone (a
reference to the above-mentioned movie, in case you're wondering)...
Hope this helps...
-Tim
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Tuesday, March 26, 2002 11:53 AM
> Can someone point me to good reading material on this
> subject. Is one better than the other for performance
> and manageability?
>
> Syntactically the autoallocate is shorter and seems to
> be more hands off (does that mean worry free also?).
>
>
> TIA
>
>
> =====
>
> Sundeep Maini
> Consultant
> Currently on Assignement at Marshfield Clinic WI
> [EMAIL PROTECTED]
>
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