Q：$archived_log中显示creator有多种，如果是FGRD，这可能是alter system archive log current，那么还有看到是RMAN，这是怎么产生的？
A：可能是这些archive之前被rman catalog过。见下面的testcase：
[oracle10g@testdb archivelog]$ cd 2014_09_28
[oracle10g@testdb 2014_09_28]$ ls
o1_mf_1_51_b2g3dm1s_.arc o1_mf_1_52_b2g3f81q_.arc o1_mf_1_53_b2g467rk_.arc o1_mf_1_54_b2g469qm_.arc o1_mf_1_55_b2g46fqr_.arc
[oracle10g@testdb 2014_09_28]$ mkdir -p /tmp/arctmp
[oracle10g@testdb 2014_09_28]$ mv *.arc /tmp/arctmp/
[oracle10g@testdb 2014_09_28]$ cd /tmp/arctmp
[oracle10g@testdb arctmp]$ ls
o1_mf_1_51_b2g3dm1s_.arc o1_mf_1_52_b2g3f81q_.arc o1_mf_1_53_b2g467rk_.arc o1_mf_1_54_b2g469qm_.arc o1_mf_1_55_b2g46fqr_.arc
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$ rman target /
Recovery Manager: Release 10.2.0.5.0 - Production on Sun Sep 28 03:34:06 2014
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: ORA10G (DBID=4148492656)
RMAN> crosscheck archivelog all;
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=142 devtype=DISK
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_17/o1_mf_1_3_9wfokdfm_.arc recid=3 stamp=853127084
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_17/o1_mf_1_4_9wfokddk_.arc recid=1 stamp=853127084
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_17/o1_mf_1_5_9wfokdds_.arc recid=2 stamp=853127084
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_18/o1_mf_1_1_9wjs3np7_.arc recid=4 stamp=853229047
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_18/o1_mf_1_2_9wjs7h24_.arc recid=5 stamp=853229167
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_24/o1_mf_1_3_9x0bpc79_.arc recid=6 stamp=853738571
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_24/o1_mf_1_4_9x0pnnfx_.arc recid=7 stamp=853750807
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_07_24/o1_mf_1_5_9x0pnt67_.arc recid=8 stamp=853750813
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_04/o1_mf_1_6_9xxrcb9z_.arc recid=9 stamp=854702835
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_12/o1_mf_1_7_9yl8c2j5_.arc recid=10 stamp=855374564
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_20/o1_mf_1_8_9z7vvndx_.arc recid=11 stamp=856082678
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_9_9zqk95rq_.arc recid=12 stamp=856596133
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_10_9zqkhdc0_.arc recid=13 stamp=856596333
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_11_9zqlbb40_.arc recid=14 stamp=856597196
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_12_9zqlbkyg_.arc recid=15 stamp=856597205
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_13_9zqlby6j_.arc recid=16 stamp=856597219
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_14_9zqlcnrt_.arc recid=17 stamp=856597236
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_15_9zqlcofb_.arc recid=18 stamp=856597237
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_16_9zqlcoyv_.arc recid=19 stamp=856597237
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_17_9zqlcpjc_.arc recid=20 stamp=856597238
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_18_9zqlcq1p_.arc recid=21 stamp=856597239
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_19_9zqlcqjb_.arc recid=22 stamp=856597239
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_20_9zqld0n4_.arc recid=23 stamp=856597250
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_21_9zqldjv8_.arc recid=24 stamp=856597266
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_22_9zqldrbl_.arc recid=25 stamp=856597272
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_23_9zqldsy9_.arc recid=26 stamp=856597274
validation succeeded for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_08_26/o1_mf_1_24_9zqldt4t_.arc recid=27 stamp=856597274
validation failed for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_51_b2g3dm1s_.arc recid=28 stamp=859432723
validation failed for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_52_b2g3f81q_.arc recid=29 stamp=859432744
validation failed for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_53_b2g467rk_.arc recid=30 stamp=859433543
validation failed for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_54_b2g469qm_.arc recid=31 stamp=859433545
validation failed for archived log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_55_b2g46fqr_.arc recid=32 stamp=859433549
Crosschecked 32 objects
RMAN> delete expired archivelog all;
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=142 devtype=DISK
List of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - --------- ----
28 1 51 X 28-SEP-14 /u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_51_b2g3dm1s_.arc
29 1 52 X 28-SEP-14 /u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_52_b2g3f81q_.arc
30 1 53 X 28-SEP-14 /u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_53_b2g467rk_.arc
31 1 54 X 28-SEP-14 /u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_54_b2g469qm_.arc
32 1 55 X 28-SEP-14 /u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_55_b2g46fqr_.arc
Do you really want to delete the above objects (enter YES or NO)? Y
deleted archive log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_51_b2g3dm1s_.arc recid=28 stamp=859432723
deleted archive log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_52_b2g3f81q_.arc recid=29 stamp=859432744
deleted archive log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_53_b2g467rk_.arc recid=30 stamp=859433543
deleted archive log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_54_b2g469qm_.arc recid=31 stamp=859433545
deleted archive log
archive log filename=/u01/ora10g/app/oracle/flash_recovery_area/ORA10G/archivelog/2014_09_28/o1_mf_1_55_b2g46fqr_.arc recid=32 stamp=859433549
Deleted 5 EXPIRED objects
RMAN>
RMAN>
RMAN>
RMAN> exit
Recovery Manager complete.
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$ rman target /
Recovery Manager: Release 10.2.0.5.0 - Production on Sun Sep 28 03:35:11 2014
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: ORA10G (DBID=4148492656)
RMAN> catalog start with '/tmp/arctmp';
using target database control file instead of recovery catalog
searching for all files that match the pattern /tmp/arctmp
List of Files Unknown to the Database
=====================================
File Name: /tmp/arctmp/o1_mf_1_55_b2g46fqr_.arc
File Name: /tmp/arctmp/o1_mf_1_53_b2g467rk_.arc
File Name: /tmp/arctmp/o1_mf_1_54_b2g469qm_.arc
File Name: /tmp/arctmp/o1_mf_1_52_b2g3f81q_.arc
File Name: /tmp/arctmp/o1_mf_1_51_b2g3dm1s_.arc
Do you really want to catalog the above files (enter YES or NO)? Y
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: /tmp/arctmp/o1_mf_1_55_b2g46fqr_.arc
File Name: /tmp/arctmp/o1_mf_1_53_b2g467rk_.arc
File Name: /tmp/arctmp/o1_mf_1_54_b2g469qm_.arc
File Name: /tmp/arctmp/o1_mf_1_52_b2g3f81q_.arc
File Name: /tmp/arctmp/o1_mf_1_51_b2g3dm1s_.arc
RMAN>
RMAN> exit
Recovery Manager complete.
[oracle10g@testdb arctmp]$
[oracle10g@testdb arctmp]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.5.0 - Production on Sun Sep 28 03:35:48 2014
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining Scoring Engine
and Real Application Testing options
SQL> select SEQUENCE#,CREATOR from v$archived_log order by SEQUENCE# desc;
SEQUENCE# CREATOR
---------- -------
55 RMAN
55 ARCH
54 RMAN
54 ARCH
53 RMAN
53 ARCH
52 RMAN
52 ARCH
51 RMAN
51 ARCH
24 ARCH
SEQUENCE# CREATOR
---------- -------
23 ARCH
22 ARCH
21 ARCH
20 ARCH
19 ARCH
18 ARCH
17 ARCH
16 ARCH
15 ARCH
14 ARCH
13 ARCH
SEQUENCE# CREATOR
---------- -------
12 ARCH
11 ARCH
10 ARCH
9 ARCH
8 ARCH
7 ARCH
6 ARCH
5 FGRD
5 ARCH
4 ARCH
4 FGRD
SEQUENCE# CREATOR
---------- -------
3 ARCH
3 FGRD
2 ARCH
1 ARCH
37 rows selected.
SQL>