Temporary LOBs - bad performance when nocache is used

Hello.
Please, advise me what could be the reason of bad performance row 8 from the next anonymous block:
declare
    i integer;
    c clob := 'c';
    procedure LTrimSys(InCLOB in clob ) is
        OutCLOB clob;
    begin
        DBMS_LOB.CREATETEMPORARY(OutCLOB, false, DBMS_LOB.call);
        dbms_lob.Copy(OutCLOB, InCLOB, dbms_lob.getlength(InCLOB));
        DBMS_LOB.freetemporary(OutCLOB);
    end;
begin
    for j in 1 .. 1000 loop
        LTrimSys(c);
    end loop;
end;
I have two practically identical databases 10.2.0.4.0 EE 64-bit on Windows
On first DB I have elapsed time: 4 sec, on second - 0.2 sec
I didn't find important difference between init parameters (hidden parameters too).
First DB has more memory (PGA) then second.
Main time events in time of executing anonymous block on first DB are
PL/SQL execution elapsed time
DB CPU
sql execute elapsed time
DB time
In second DB - the same but much less
If I use caching of temporary LOBs then both DBs work fine, but I can not understand why first DB works slowly when I use nocache temporary LOBs.
What can be the reason?

I don't think that is the problem. See next outputs:
select * from V$PGASTAT order by name
NAME
VALUE
UNIT
PGA memory freed back to OS
49016834031616
bytes
aggregate PGA auto target
170893312
bytes
aggregate PGA target parameter
1073741824
bytes
bytes processed
95760297282560
bytes
cache hit percentage
93,43
percent
extra bytes read/written
6724614496256
bytes
global memory bound
107366400
bytes
max processes count
115
maximum PGA allocated
2431493120
bytes
maximum PGA used for auto workareas
372516864
bytes
maximum PGA used for manual workareas
531456
bytes
over allocation count
102639421
process count
57
recompute count (total)
117197176
total PGA allocated
1042407424
bytes
total PGA inuse
879794176
bytes
total PGA used for auto workareas
757760
bytes
total PGA used for manual workareas
0
bytes
total freeable PGA memory
75694080
bytes
select * from V$PGA_TARGET_ADVICE_HISTOGRAM where PGA_TARGET_FACTOR = 1
PGA_TARGET_FOR_ESTIMATE
PGA_TARGET_FACTOR
ADVICE_STATUS
LOW_OPTIMAL_SIZE
HIGH_OPTIMAL_SIZE
ESTD_OPTIMAL_EXECUTIONS
ESTD_ONEPASS_EXECUTIONS
ESTD_MULTIPASSES_EXECUTIONS
ESTD_TOTAL_EXECUTIONS
IGNORED_WORKAREAS_COUNT
1073741824
1
ON
2199023255552
4398046510079
0
0
0
0
0
1073741824
1
ON
1099511627776
2199023255551
0
0
0
0
0
1073741824
1
ON
549755813888
1099511627775
0
0
0
0
0
1073741824
1
ON
274877906944
549755813887
0
0
0
0
0
1073741824
1
ON
137438953472
274877906943
0
0
0
0
0
1073741824
1
ON
68719476736
137438953471
0
0
0
0
0
1073741824
1
ON
34359738368
68719476735
0
0
0
0
0
1073741824
1
ON
17179869184
34359738367
0
0
0
0
0
1073741824
1
ON
8589934592
17179869183
0
0
0
0
0
1073741824
1
ON
4294967296
8589934591
0
0
0
0
0
1073741824
1
ON
2147483648
4294967295
0
0
0
0
0
1073741824
1
ON
1073741824
2147483647
0
0
0
0
0
1073741824
1
ON
536870912
1073741823
0
0
0
0
0
1073741824
1
ON
268435456
536870911
0
0
0
0
0
1073741824
1
ON
134217728
268435455
0
376
0
376
0
1073741824
1
ON
67108864
134217727
0
0
0
0
0
1073741824
1
ON
33554432
67108863
0
0
0
0
0
1073741824
1
ON
16777216
33554431
1
0
0
1
0
1073741824
1
ON
8388608
16777215
10145
45
0
10190
0
1073741824
1
ON
4194304
8388607
20518
21
0
20539
0
1073741824
1
ON
2097152
4194303
832
1
0
833
0
1073741824
1
ON
1048576
2097151
42440
0
0
42440
0
1073741824
1
ON
524288
1048575
393113
7
0
393120
0
1073741824
1
ON
262144
524287
10122
2
0
10124
0
1073741824
1
ON
131072
262143
22712
0
0
22712
0
1073741824
1
ON
65536
131071
110215
0
0
110215
0
1073741824
1
ON
32768
65535
0
0
0
0
0
1073741824
1
ON
16384
32767
0
0
0
0
0
1073741824
1
ON
8192
16383
0
0
0
0
0
1073741824
1
ON
4096
8191
0
0
0
0
0
1073741824
1
ON
2048
4095
83409618
0
0
83409618
0
1073741824
1
ON
1024
2047
0
0
0
0
0
1073741824
1
ON
0
1023
0
0
0
0
0
SELECT optimal_count, round(optimal_count*100/total, 2) optimal_perc,
       onepass_count, round(onepass_count*100/total, 2) onepass_perc,
       multipass_count, round(multipass_count*100/total, 2) multipass_perc
FROM
       (SELECT decode(sum(total_executions), 0, 1, sum(total_executions)) total,
               sum(OPTIMAL_EXECUTIONS) optimal_count,
               sum(ONEPASS_EXECUTIONS) onepass_count,
               sum(MULTIPASSES_EXECUTIONS) multipass_count
        FROM   v$sql_workarea_histogram);
OPTIMAL_COUNT
OPTIMAL_PERC
ONEPASS_COUNT
ONEPASS_PERC
MULTIPASS_COUNT
MULTIPASS_PERC
12181507016
100
146042
0
0
0

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Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Thank you for any help.

Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "DefaultRefresh" # [<bool>]
#Option "ModeSetClearScreen" # [<bool>]
Identifier "Card0"
Driver "vesa"
VendorName "ATI Technologies Inc"
BoardName "RV770 [Radeon HD 4850]"
BusID "PCI:8:0:0"
EndSection
and
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
I see no reason for those to be there.
make a backup of your xorg.conf and remove / comment those lines.

2.1 RC1 - Pure performance when Preferences.Worksheet."script path" is used

When I fill out the "Select default path to look for scripts" text box on the Worksheet page in Preferences, I expirience very bad performance when I type in sql statements.
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Bug already logged from duplicate posts from other users.
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Bad performance in web intelligence reports

Hi,
We use Business Objects with Web Intelligence documents and Crystal Reports.
We are supporting bad performance when we use the reports specilly when we need to change the drill options
Can someone telling me if exists some best practices to improve performance? What features should i look to?
                  Best Regards
                        João Fernandes

Hi,
Thank you for your interest. I know that this a issue with many variables because that i need information about anything that could cause bad performance.
For bad performance i mean the time that we take running and refreshing reports data.
We have reports with many lines but the performance is bad even when a few users are in the system
                             Best Regards
                                     João Fernandes

Help: Bad performance in marketing documents!

Hello,
When creating an AR delivery note which has about 10 lines, we have really noticed that the creation of lines becomes slower and slower. This especially happens when making tab in the system field "Quantity". In fact, before going to the next field quickly, it stays in Quantity field for about 5 seconds!
The number of formatted searches in AR delivery note is only 5. And only one is automatic. The number of user fields is about 5.
We have heard about the bad performance when the number of lines increases in the documents when having formatted searches, but it is odd to happen this with about 10 lines in the document.
We are using PL16 and this issue seems to have been solved already at PL10.
Could you throw some light on this?
Thanks in advance,

It is solved now.
It had to be with the automatic formated search in 2 head fields.
If the automatic search is removed, the performance is OK.
Hope it helps you,

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