Resource consumption for increasing column size

Hello,
DB: 11.2.0.1.0
We need to increase the size of a column in the huge table (~ 400 Gb) from NUMBER(9) to NUMBER(18). Could you tell me what's the internals of the command
alter table foo modify (bar NUMBER (18))Will it change the dictionary only, or it must scan the table block by block to make changes?
Thank you in advance,
Constantine

rp0428 wrote:
>
Thats where i was pointing... existing column values from existing row(s) are checked .. isnt it ...
>
No - that is wrong for OPs use case.
A change from NUMBER(9) to NUMBER(18) is a dictionary-only change.
Existing data DOES NOT need to be checked at all since it is impossible for existing data to conform to NUMBER(9) but not conform to NUMBER(18).Thank you very much rp0428. You're right. Karan just tried to turn my attention to all possible details of problem although I've stated at the begin of discussion that I need to increase the precision.

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Method_opt = 'FOR ALL COLUMNS SIZE REPEAT'

Hi all Gurus,
We have a script to take statitics (see below), it runs every day and All the tables has de "MONITORING" option in a 9.2.0.5 database.
My question is concern to "method_opt =>'FOR ALL COLUMNS SIZE REPEAT',OPTIONS=>'GATHER EMPTY',estimate_percent =>5);
So, for a new table with columnns and indexes (with "monitoring" option), will it create statistics or histograms statistics when the script run for the first time on the table??? and then, will continue with/without histograms???
begin
DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO();
DBMS_STATS.GATHER_DATABASE_STATS(DEGREE=>4,GRANULARITY=>'ALL',CASCADE=>TRUE,method_opt =>'FOR ALL COLUMNS SIZE REPEAT',OPTIONS=>'GATHER EMPTY',estimate_percent =>5);
DBMS_STATS.GATHER_DATABASE_STATS(estimate_percent =>5,OPTIONS=>'GATHER STALE',method_opt =>'FOR ALL COLUMNS SIZE REPEAT',degree => 4, cascade=>true,STATTAB=>'TABLA_ESTADISTICAS',STATID=>to_char(sysdate,'yymmdd'),STATOWN=>'OPER');
end;
Regards,

Hi all Gurus,
We have a script to take statitics (see below), it runs every day and All the tables has de "MONITORING" option in a 9.2.0.5 database.
My question is concern to "method_opt =>'FOR ALL COLUMNS SIZE REPEAT',OPTIONS=>'GATHER EMPTY',estimate_percent =>5);
So, for a new table with columnns and indexes (with "monitoring" option), will it create statistics or histograms statistics when the script run for the first time on the table??? and then, will continue with/without histograms???
begin
DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO();
DBMS_STATS.GATHER_DATABASE_STATS(DEGREE=>4,GRANULARITY=>'ALL',CASCADE=>TRUE,method_opt =>'FOR ALL COLUMNS SIZE REPEAT',OPTIONS=>'GATHER EMPTY',estimate_percent =>5);
DBMS_STATS.GATHER_DATABASE_STATS(estimate_percent =>5,OPTIONS=>'GATHER STALE',method_opt =>'FOR ALL COLUMNS SIZE REPEAT',degree => 4, cascade=>true,STATTAB=>'TABLA_ESTADISTICAS',STATID=>to_char(sysdate,'yymmdd'),STATOWN=>'OPER');
end;
Regards,
{code}
I have taken following explanation from documentation:
{code}
METHOD_OPT - The value controls column statistics collection and histogram creation. It accepts either of the following options, or both in combination:
FOR ALL [INDEXED | HIDDEN] COLUMNS [size_clause]
FOR COLUMNS [size clause] column|attribute [size_clause] [,column|attribute [size_clause]...]
size_clause is defined as size_clause := SIZE {integer | REPEAT | AUTO | SKEWONLY}
column is defined as column := column_name | (extension)
- integer : Number of histogram buckets. Must be in the range [1,254].
- REPEAT : Collects histograms only on the columns that already have histograms.
- AUTO : Oracle determines the columns to collect histograms based on data distribution and the workload of the columns.
- SKEWONLY : Oracle determines the columns to collect histograms based on the data distribution of the columns.
- column_name : name of a column
- extension : can be either a column group in the format of (column_name, colume_name [, ...]) or an expression
The default is FOR ALL COLUMNS SIZE AUTO.
{code}
GATHER EMPTY: Gathers statistics on objects which currently have no statistics. Return a list of objects found to have no statistics.
Reference: http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28419/d_stats.htm
Please go through the link, it will give you more clear picture on DBMS_STATS.
Regards,
S.K.

Gather_table_stats with a method opt of "for all indexed columns size 0"

I have 9 databases I support that contain the same structure, and very similar data concentrations. We are seeing inconsistent performance in the different databases due to bind variable peeking.. I have tracked it down to the Min and Max values that are gathered during the analyze. I analyze from one cluster, and export/import those statistics into the other clusters.. I then go about locking down the stats gathered. Some of the statistics are on tables that contain transient data (the older data is purged, and new data gets a new PK sequence number).
Since I am gathering statistics with a 'FOR ALL INDEXED COLUMNS SIZE 1', a min and max value are grabbed. This value is only appropriate for a short period of time, and only for a specific database. I do want oracle to know the density to help calculate, but I don't want cardinality based on whether the current bind values fall in this range..
Example
COLUMN PK
When I analyze the min is 1 and max is 5. I then let the database run, and the new min is 100 and max is 105.. same number of rows, but different min/max. At first a select * from table where pk>=1 and pk <=5 would return a cardinality of 5.. Later, a seelct * from tables where pk>=100 and pk<=105 would return a cardinaility 1.
Any ideas how to avoid this other than trying set min and max to something myself (like min =1 max = 99999999). ??

MarkDPowell wrote:
The Oracle documentation on bind variable peeking said it did not peek without histograms and I cannot remember ever seeing on 9.2 where the trace showed otherwise. Mark,
see this simple test case run on 9.2.0.8. No histograms, but bind variable peeking, as you can see that the EXPLAIN PLAN output generated by AUTOTRACE differs from the estimated cardinality of the actual plan used at runtime.
Which documentation do you refer to?
SQL>
SQL> alter session set nls_language = 'AMERICAN';
Session altered.
SQL>
SQL> drop table bind_peek_test;
Table dropped.
SQL>
SQL> create table bind_peek_test
2 as
3 select
4            100 as n1
5          , cast(dbms_random.string('a', 20) as varchar2(20)) as filler
6 from
7            dual
8 connect by
9            level <= 1000;
Table created.
SQL>
SQL> exec dbms_stats.gather_table_stats(null, 'bind_peek_test', method_opt=>'FOR ALL COLUMNS SIZE 1')
PL/SQL procedure successfully completed.
SQL>
SQL> variable n number
SQL>
SQL> variable n2 number
SQL>
SQL> alter system flush shared_pool;
System altered.
SQL>
SQL> exec :n := 1; :n2 := 50;
PL/SQL procedure successfully completed.
SQL>
SQL> set autotrace traceonly
SQL>
SQL> select * from bind_peek_test where n1 >= :n and n1 <= :n2;
no rows selected
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1000 Bytes=24
          000)
   1    0   FILTER
   2    1     TABLE ACCESS (FULL) OF 'BIND_PEEK_TEST' (Cost=2 Card=100
          0 Bytes=24000)
Statistics
        236 recursive calls
          0 db block gets
         35 consistent gets
          0 physical reads
          0 redo size
        299 bytes sent via SQL*Net to client
        372 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          4 sorts (memory)
          0 sorts (disk)
          0 rows processed
SQL>
SQL> set autotrace off
SQL>
SQL> select
2            cardinality
3 from
4            v$sql_plan
5 where
6            cardinality is not null
7 and      hash_value in (
8    select
9           hash_value
10    from
11           v$sql
12    where
13           sql_text like 'select * from bind_peek_test%'
14    );
CARDINALITY
          1
SQL>
SQL> alter system flush shared_pool;
System altered.
SQL>
SQL> exec :n := 100; :n2 := 100;
PL/SQL procedure successfully completed.
SQL>
SQL> set autotrace traceonly
SQL>
SQL> select * from bind_peek_test where n1 >= :n and n1 <= :n2;
1000 rows selected.
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1000 Bytes=24
          000)
   1    0   FILTER
   2    1     TABLE ACCESS (FULL) OF 'BIND_PEEK_TEST' (Cost=2 Card=100
          0 Bytes=24000)
Statistics
        236 recursive calls
          0 db block gets
        102 consistent gets
          0 physical reads
          0 redo size
      34435 bytes sent via SQL*Net to client
       1109 bytes received via SQL*Net from client
         68 SQL*Net roundtrips to/from client
          4 sorts (memory)
          0 sorts (disk)
       1000 rows processed
SQL>
SQL> set autotrace off
SQL>
SQL> select
2            cardinality
3 from
4            v$sql_plan
5 where
6            cardinality is not null
7 and      hash_value = (
8    select
9           hash_value
10    from
11           v$sql
12    where
13           sql_text like 'select * from bind_peek_test%'
14    );
CARDINALITY
       1000
SQL>
SQL> spool offRegards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

How to increase the column size of Alv tbale

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How to Increase the Rows and Columns Size of Bex Query in Enterprise Portal of SAP 7.3

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Dear All,
Please find the attached screen shot.
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Parse        1      0.00       0.00          0          0          0           0
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----------------------------------------   Waited ---------- ------------
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db file sequential read                         4        0.00          0.00
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DBVersion: 9.2.0.8
Regards,
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Sreekanth Munagala wrote:
For each rowsource operation, resource consumption details (cr,pr,pw,time) are not shown in the TKPROF output.
How can i get these details as well?
DBVersion: 9.2.0.8You can get those details by setting values for following parameters (at session level, preferably) before generating the 10046 trace.
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ALTER SESSION SET timed_statistics = TRUE ;

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Resource consumption for increasing column size

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