Effects of the size of the Collection

Hi all

We can specify the initial capacity for the types of list, maps and Collection Set.

Generally, if you look at the hardware level, there is quick access to lots of bits of power of 2. (2 ^ I) For example. 8 bytes, 64 bytes...

So, if we maintain the size of the power Collection of 2 then it increase my performance of the Application that uses the number of collection types.

# Java manages internal memory alignment, you shouldn't worry about that yourself. Everything you think you can make Java better. Much better. Write stupid code instead of help optimize the JVM.

http://Java.Sun.com/developer/technicalarticles/interviews/devinsight_1/

Tags: Java

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      FROM APEX_COLLECTIONS
      WHERE (COLLECTION_NAME     = :P_NAS_RCOLLECTION_NAME)
      AND C001               = 'REMOTE'
    
    UNION ALL
    
    SELECT ROW_NUMBER() OVER (ORDER BY C001) rw_nm,
        APEX_ITEM.SELECT_LIST_FROM_QUERY_XL(42, C001, 'SELECT DISPLAY_VAL d, RETURN_VAL r FROM SORD.APX_NAS_LOC_REM_SNAP_DEF OUTER'
        , 'style="width:100px" ', 'NO', '', '-Select Type-', 'f42_'
        || LPAD(9000 + ROWNUM, 4, '0'), '', 'NO' ) SITE_TYPE_1 ,
        C001  SITE_TYPE ,
    APEX_ITEM.SELECT_LIST_FROM_QUERY_XL(23, C003, 'SELECT NULL d, NULL r FROM DUAL', 'onchange="javascript:setFILER(this,''f25'');"', 'YES', '-1', '-Select Filer-', 'f23_'
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      FROM APEX_COLLECTIONS
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                        P_SEQ          => APEX_APPLICATION.G_f20 (i)
                   );
              l_cnt := l_cnt + 1;
              l_stepid := 40;
    --END IF;
    
    END LOOP;
    IF l_cnt = 0 THEN
         apex_application.g_print_success_message := apex_application.g_print_success_message || 'No Change has been made.' ;
    ELSE
         apex_application.g_print_success_message := apex_application.g_print_success_message ||  'Successfully Deleted ' || l_cnt || ' row(s).' ;
    
    END IF;
    EXCEPTION 
         WHEN OTHERS THEN
              ROLLBACK;
              RAISE_APPLICATION_ERROR(-20010, 'Failed to Delete Collections' || l_stepid || ' with error message ' || REGEXP_REPLACE(SQLERRM,'[('')(<)(>)(,)(;)(:)(")('')]{1,}', '') ) ;
    END;
    {code}
    
    Item 'F02' is a Select List which has values ( Local / Remote / Snapvault). 
    
    Thanks!
    Chandu                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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       i_subject_id_list             T_ID_ARRAY;
       v_index  number;
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       into i_subject_id_list
       from (select 1 ID from dual
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