Possible PL/SQL Script ?

Posted on 2014-04-08
Last Modified: 2014-04-08
I've got a table with about 600 partitions.  Somebody here wants this get_compression_ratio run on databases.  If i understand this correct i need to run once for each of these partitions.  
Can I get a script that will look at dba_-tab_partitions and select partition_name
where user will always be 'auser' , scratchtbsname will always be scratch, tablename will always be tablea and partition name will come from dba_tab_partitions.

set serveroutput on
v_blkcnt_cmp pls_integer;
v_blkcnt_uncmp pls_integer;
v_row_cmp pls_integer;
v_row_uncmp pls_integer;
v_cmp_ratio number;
v_comptype_str varchar2(60);
scratchtbsname => upper('&ScratchTBS'),
ownname => user,
tabname => upper('&TableName'),
partname => NULL,
comptype => dbms_compression.comp_for_query_high,
blkcnt_cmp => v_blkcnt_cmp,
blkcnt_uncmp => v_blkcnt_uncmp,
row_cmp => v_row_cmp,
row_uncmp => v_row_uncmp,
cmp_ratio => v_cmp_ratio,
comptype_str => v_comptype_str, subset_numrows=>&num_rows );
dbms_output.put_line('Estimated Compression Ratio: '||to_char(v_cmp_ratio));
dbms_output.put_line('Blocks used by compressed sample: '||to_char(v_blkcnt_cmp));
dbms_output.put_line('Blocks used by uncompressed sample: '||to_char(v_blkcnt_uncmp));
Question by:xoxomos
  • 2
LVL 16

Accepted Solution

Wasim Akram Shaik earned 500 total points
ID: 39985461
this will generate the script  based on your script,  placed some values by using dba_Tab_partitions,
also you can modify the user name and comment out the part select user from dual if not needed and can hard code the table name if you want..

if you place the values v_blkcnt_cmp,v_row_cmp those will get subsituted below, else it will place null there

set serveroutput on;

   v_blkcnt_cmp     PLS_INTEGER;
   v_blkcnt_uncmp   PLS_INTEGER;
   v_row_cmp        PLS_INTEGER;
   v_row_uncmp      PLS_INTEGER;
   v_cmp_ratio      NUMBER;
   v_comptype_str   VARCHAR2 (60);
   var_sql          VARCHAR2 (10000);

   CURSOR c1
      SELECT *
        FROM dba_tab_partitions
       WHERE table_name = 'COSTS';

   v_user           VARCHAR2 (100);
     INTO v_user

   FOR l1 IN c1
      var_sql := 'dbms_compression.get_compression_ratio(scratchtbsname => ';
      var_sql :=
            var_sql || CHR (39) || UPPER (l1.tablespace_name) || CHR (39)
            || ',';
      var_sql :=
               var_sql || 'ownname =>' || CHR (39) || v_user || CHR (39)
               || ',';
      var_sql :=
         || 'tabname => '
         || CHR (39)
         || UPPER (l1.table_name)
         || CHR (39)
         || ',';
      var_sql :=
         || 'partname => NULL,comptype => dbms_compression.comp_for_query_high,';
      var_sql := var_sql || 'blkcnt_cmp => ' || v_blkcnt_cmp || ',';
      var_sql := var_sql || 'blkcnt_uncmp =>' || v_blkcnt_uncmp || ',';
      var_sql := var_sql || 'row_cmp => ' || v_row_cmp || ',';
      var_sql := var_sql || 'row_uncmp =>' || v_row_uncmp || ',';
      var_sql := var_sql || ' cmp_ratio => ' || v_cmp_ratio || ',';
      var_sql := var_sql || 'comptype_str => ' ||chr(39)|| v_comptype_str ||chr(39)|| ',';
      var_sql := var_sql || 'subset_numrows=>' || l1.num_rows || ' );';
--dbms_output.put_line('Estimated Compression Ratio: '||to_char(v_cmp_ratio));
--dbms_output.put_line('Blocks used by compressed sample: '||to_char(v_blkcnt_cmp));
--dbms_output.put_line('Blocks used by uncompressed sample: '||to_char(v_blkcnt_uncmp));
      DBMS_OUTPUT.put_line ('exec ' || var_sql);
      DBMS_OUTPUT.put_line ('   ');
LVL 16

Expert Comment

by:Wasim Akram Shaik
ID: 39986347
If you want to execute this then add a line
Execute immediate var_sql;
Before end loop; statement

Author Closing Comment

ID: 39986503
Thanks Wizard, will let you know how i fare :-)

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