RE: insert /*+APPEND*/ Unexpected result (more redo log)

From: Richard Ji <richard.ji_at_mobilespring.com>
Date: Tue, 06 May 2003 08:51:48 -0800
Message-ID: <F001.005913A4.20030506085148@fatcity.com>

try  

alter table redolog_test nologging;  

before the insert append

-----Original Message-----
Sent: Tuesday, May 06, 2003 9:52 AM
To: Multiple recipients of list ORACLE-L

Hi All,

I'm getting UNEXPECTED result in both 8i and 9iR2.

Could someone please tell me why insert /*+APPEND*/ generates more redo log.

I'm pretty sure that there is NO index involved in my test table(redolog_test).
Also the user is not a SYS and SYSTEM.
The DB is running in ARCHIVE LOG mode.

SQL> show user
USER is "MUT"

SQL> drop table redolog_test;
Table dropped.

SQL> create table redolog_test pctfree 99 pctused 1 as select * from all_objects
where 1=2;
Table created.

SQL> insert into redolog_test select * from all_objects; 19412 rows created.

Statistics

---

       2003  recursive calls 
      89992  db block gets 
     161720  consistent gets 
          0  physical reads 
   10661144  redo size  <======== 
        438  bytes sent via SQL*Net to client 
        433  bytes received via SQL*Net from client 
          4  SQL*Net roundtrips to/from client 
          2  sorts (memory) 
          0  sorts (disk) 
      19412  rows processed 

SQL> truncate table redolog_test;
Table truncated.

SQL> insert /*+APPEND*/ into redolog_test select * from all_objects; 19412 rows created.

Statistics

---

       2012  recursive calls 
        365  db block gets 
     142229  consistent gets 
          0  physical reads 
  159534376  redo size  <=======(15 Times higher) 
        430  bytes sent via SQL*Net to client 
        445  bytes received via SQL*Net from client 
          4  SQL*Net roundtrips to/from client 
          2  sorts (memory) 
          0  sorts (disk) 
      19412  rows processed 

SQL> What could be wrong?

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--

Author: Richard Ji
  INET: richard.ji_at_mobilespring.com

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