What is the size of table extraction

Hello

I saw it in the help online (integrated CREATE_GROUP_FROM_QUERY)

"array_fetch_size specifies the fetch array size.  The default table size is 20. »

-What is ' array_fetch_size '?

I did some tests in sql * more to refer to some points:

SQL> create table all_obj as select * from all_objects;

A "TEST CASE".

SQL> set autotrace traceonly statistics;
SQL> set arraysize 1;
SQL> select * from all_obj;

Statistics

----------------------------------------------

0 recursive calls

0 db block Gets

28524 consistent gets

0 physical reads

0 redo size

5641932 bytes sent via SQL * Net to client

309351 bytes received via SQL * Net from client

28090 SQL * Net back and forth to and from the client

0 sorts (memory)

0 sorts (disk)

56178 rows processed

B TEST CASE '

SQL> set arraysize 100;
SQL> select * from all_obj;

Statistics

----------------------------------------------------------

0 recursive calls

0 db block Gets

1364 gets coherent

0 physical reads

0 redo size

2256142 bytes sent via SQL * Net to client

6678 bytes received via SQL * Net from client

563 SQL * Net back and forth to and from the client

0 sorts (memory)

0 sorts (disk)

56178 rows processed

C "TEST CASE".

SQL> set arraysize 5000;  /*the maximum val set in sql*plus*/
SQL> select * from all_obj;

Statistics

----------------------------------------------------------

4 recursive calls

0 db block Gets

889 consistent gets

0 physical reads

0 redo size

2188492 bytes sent via SQL * Net to client

628 bytes received via SQL * Net from client

13 SQL * Net back and forth to and from the client

0 sorts (memory)

0 sorts (disk)

56178 rows processed

Notes: I've run the queries above several times that each of them and I noticed the same results.

Tags: Oracle Development

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