How to manualy delete histograms in 10.2.0.3 .

Hi,
I've got serious issue with my 10.2.0.3 4 node rac .
The problem is rowcache size in particular dc_histogram_defs :
CACHE#     TYPE     SUBORDINATE#     PARAMETER     COUNT     USAGE     FIXED     GETS     GETMISSES     SCANS     SCANMISSES     SCANCOMPLETES     MODIFICATIONS     FLUSHES     DLM_REQUESTS     DLM_CONFLICTS     DLM_RELEASES
16     PARENT          dc_histogram_defs     1116884     1116884     0     38680620     19580733     0     0     0     113607     113605     19847714     15495     18387433
8     PARENT          dc_objects     55757     55757     55     426334     66078     0     0     0     8796     7012     80957     2936     3444
2     PARENT          dc_segments     52442     52442     0     1923667     576468     0     0     0     477486     477444     1484668     2654     505099
16     SUBORDINATE     0     dc_histogram_data     33784     33784     0     1051801     118655     0     0     0     10468     8652     0     0     0
8     SUBORDINATE     0     dc_object_grants     903     903     0     23537     905     0     0     0     0     0     0     0     0
16     SUBORDINATE     1     dc_histogram_data     722     722     0     99115     4372     0     0     0     3026     2736     0     0     0
11     PARENT          dc_object_ids     569     569     55     986083     8803     0     0     0     2566     2409     14155     128     4728
3     PARENT          dc_rollback_segments     411     411     1     1176543     600     0     0     0     158     157     1161     190     0
10     PARENT          dc_usernames     259     259     0     128026     294     0     0     0     0     0     294     0     35
6     PARENT          dc_files     208     208     0     2912     208     0     0     0     0     0     208     0     0
17     PARENT          dc_global_oids     123     123     0     105714     158     0     0     0     0     0     158     0     35
7     PARENT          dc_users     91     91     0     3180849     238     0     0     0     23     23     288     3     144
24     PARENT          outstanding_alerts     82     82     0     14220     13120     0     0     0     44     44     26935     13009     2
7     SUBORDINATE     1     dc_users     81     81     0     1175519     169     0     0     0     0     0     0     0     0
5     PARENT          dc_tablespace_quotas     56     56     0     679614     114     0     0     0     3150     3150     192726     55     3
0     PARENT          dc_tablespaces     44     44     0     2728891     114     0     0     0     0     0     114     0     70
7     SUBORDINATE     0     dc_users     29     29     0     49971     97     0     0     0     0     0     0     0     0
12     PARENT          dc_constraints     24     24     0     9850     4050     0     0     0     9848     9828     16352     161     598
13     PARENT          dc_sequences     11     11     0     12824     273     0     0     0     12824     12824     23197     258     4
15     PARENT          dc_database_links     4     4     0     2318544     42     0     0     0     0     0     42     0     38
22     PARENT          dc_awr_control     1     1     0     1654     41     0     0     0     16     16     73     40     0
14     PARENT          dc_profiles     1     1     0     25642     5     0     0     0     0     0     5     0     4
25     PARENT          dc_hintsets     0     0     0     0     0     0     0     0     0     0     0     0     0
19     SUBORDINATE     0     dc_partition_scns     0     0     0     0     0     0     0     0     0     0     0     0     0
7     SUBORDINATE     2     dc_users     0     0     0     0     0     0     0     0     0     0     0     0     0
34     SUBORDINATE     0     realm auth     0     0     0     0     0     0     0     0     0     0     0     0     0
36     SUBORDINATE     0     Realm Subordinate Cache     0     0     0     0     0     0     0     0     0     0     0     0     0
32     PARENT          qmtmrctq_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
31     PARENT          qmtmrciq_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
30     PARENT          qmtmrctp_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
29     PARENT          qmtmrcip_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
28     PARENT          qmtmrctn_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
27     PARENT          qmtmrcin_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
23     PARENT          dc_qmc_ldap_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
9     PARENT          dc_qmc_cache_entries     0     0     0     0     0     0     0     0     0     0     0     0     0
21     PARENT          rule_or_piece     0     0     0     0     0     0     0     0     0     0     0     0     0
20     PARENT          rule_info     0     0     0     0     0     0     0     0     0     0     0     0     0
26     PARENT          global database name     0     0     0     0     0     0     0     0     0     0     0     0     0
39     PARENT          audit collector     0     0     0     0     0     0     0     0     0     0     0     0     0
38     PARENT          format     0     0     0     0     0     0     0     0     0     0     0     0     0
37     PARENT          event map     0     0     0     0     0     0     0     0     0     0     0     0     0
36     PARENT          Realm Object cache     0     0     0     0     0     0     0     0     0     0     0     0     0
35     PARENT          Command rule cache     0     0     0     0     0     0     0     0     0     0     0     0     0
34     PARENT          realm cache     0     0     0     0     0     0     0     0     0     0     0     0     0
18     PARENT          dc_outlines     0     0     0     0     0     0     0     0     0     0     0     0     0
19     PARENT          dc_table_scns     0     0     0     2170     2170     0     0     0     0     0     2170     0     0
33     PARENT          kqlsubheap_object     0     0     0     0     0     0     0     0     0     0     0     0     0
21     SUBORDINATE     0     rule_fast_operators     0     0     0     0     0     0     0     0     0     0     0     0     0
1     PARENT          dc_free_extents     0     0     0     0     0     0     0     0     0     0     0     0     0
4     PARENT          dc_used_extents     0     0     0     0     0     0     0     0     0     0     0     0     0We are getting row cache locks (rac node hangs for 30 min or so) them we got 04031 error (space problem in shared pool which is 5GB, with 15% reserver for reserved size) .
This is data warehouse with hundreds of tousands of object.
I came to idea that we should delete majority of histograms, but usual delete via delete_table_Stats makes us
to recalculate statistics on whole table (with size 1) and thats is huge impact and time consuming task.
So is there any way I can 'update' dictionary via dbms_Stats.set_column_stats, and make histograms to disapear ?
Regards.
Greg

regather the statistics on the table with method_opt=>for all columns or for all indexed columns or whatever size 1
The 'size 1' directive will remove the histogram statistics.
Sorry, didn't read ur post in a hurry. Below article (http://www.freelists.org/post/oracle-l/Any-quick-way-to-remove-histograms,13) removes histogram without re-analyzing the table. Hope that helps!!!
On 3/16/07, Wolfgang Breitling <breitliw@xxxxxxxxxxxxx> wrote:
I also did a quick check and just using
exec
dbms_stats.set_column_stats(user,'table_name',colname=>'column_name',d
istcnt=>
<num_distinct>);
will remove the histogram without removing the low_value andhigh_value.
At 01:40 PM 3/16/2007, Alberto Dell'Era wrote:
On 3/16/07, Allen, Brandon <Brandon.Allen@xxxxxxxxxxx> wrote:
Is there any faster way to remove histograms other than
re-analyzing
>
the table? I want to keep the existing table, index & columnstats,
>
but with only 1 bucket (i.e. no histograms).You might try the attached script, that reads the stats using
dbms_stats.get_column_stats and re-sets them, minus the histogram,
using dbms_stats.set_column_stats.
I haven't fully tested it - it's only 10 minutes old, even if Ihave
slightly modified for you another script I've used for quite some
time - and the spool on 10.2.0.3 seems to confirmthat the histogram
is, indeed, removed, while all the other statistics are preserved.I
have also reset density to 1/num_distinct, that is the value youget
if no histogram is collected.regards,
naren
Edited by: fuzzydba on Oct 25, 2010 10:52 AM

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