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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