[20170217]歸檔收集器.txt

--//朋友的系統資料庫很大,已經建立一臺dg,安全起見本來需要想再建一個dg,受限磁碟空間,我建議採用dg的方式建立一個僅僅接收歸檔
--//日誌的系統.

--//實際上很簡單,整個流程就是建立dg的過程,僅僅備庫上沒有資料檔案罷了.我以前做過,我檢查我的工作筆記居然發現當時沒有記錄,
--//自己在重複並做記錄:

1.環境:
SYS@book> @ &r/ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

--//我的測試環境dg已經搭建好,現在僅僅保留控制檔案,standby redo file 在主庫上已經建立,這樣備庫的控制檔案裡面已經有記錄,不
--//需要在備庫建立.

2.檢查備庫現在的情況:
SYS@bookdg> @ &r/dg/dg
PROCESS       PID STATUS       CLIENT_P GROUP# THREAD# SEQUENCE#     BLOCK#     BLOCKS DELAY_MINS
--------- ------- ------------ -------- ------ ------- ---------- ---------- ---------- ----------
RFS         23910 IDLE         UNKNOWN N/A          0          0          0          0          0
RFS         23912 IDLE         LGWR     2            1        639      16565          1          0
ARCH        23883 CLOSING      ARCH     5            1        638      73728       1842          0
MRP0        23888 APPLYING_LOG N/A      N/A          1        639      16565     102400          0

--//當前seq=639,並且不斷從主庫傳輸過來並應用.現在停止傳輸並應用.
SYS@bookdg> alter database recover managed standby database cancel ;
Database altered.

SYS@bookdg> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

--//移除全部資料檔案以及redo檔案,保留控制檔案.
$ ls -l /mnt/ramdisk/book/
total 19904
-rw-r----- 1 oracle oinstall 10174464 2017-02-17 08:45:20 control01.ctl
-rw-r----- 1 oracle oinstall 10174464 2017-02-17 08:45:20 control02.ctl

3.啟動備庫到mount:
SYS@bookdg> startup mount
ORACLE instance started.
Total System Global Area 634732544 bytes
Fixed Size                  2255792 bytes
Variable Size             197133392 bytes
Database Buffers          427819008 bytes
Redo Buffers                7524352 bytes
Database mounted.

--//在主庫執行或者切換歸檔日誌也可以.
SYS@book> alter system set log_archive_dest_state_2=defer scope=memory;
System altered.

SYS@book> alter system set log_archive_dest_state_2=enable scope=memory;
System altered.

--//在備庫觀察:
SYS@bookdg> @ &r/dg/dg
PROCESS       PID STATUS       CLIENT_P GROUP# THREAD# SEQUENCE#     BLOCK#     BLOCKS DELAY_MINS
--------- ------- ------------ -------- -------------- ---------- ---------- ---------- ----------
RFS         25620 IDLE         ARCH     N/A          0          0          0          0          0
RFS         25617 IDLE         LGWR     2            1        642         64          1          0
ARCH        25587 CLOSING      ARCH     5            1        641          1         25          0

$ ls -l /mnt/ramdisk/book/
total 173684
-rw-r----- 1 oracle oinstall 10174464 2017-02-17 08:55:23 control01.ctl
-rw-r----- 1 oracle oinstall 10174464 2017-02-17 08:55:23 control02.ctl
-rw-r----- 1 oracle oinstall 52429312 2017-02-17 08:55:24 redostb02.log
-rw-r----- 1 oracle oinstall 52429312 2017-02-17 08:53:09 redostb03.log
-rw-r----- 1 oracle oinstall 52429312 2017-02-17 08:53:09 redostb04.log

--//可以發現歸檔已經傳輸過來.在主庫執行日誌切換:
SYS@book> alter system archive log current ;
System altered.

SYS@book> alter system archive log current ;
System altered.

--//在備庫觀察:
SYS@bookdg> @ &r/dg/dg
PROCESS       PID STATUS       CLIENT_P GROUP# THREAD# SEQUENCE#     BLOCK#     BLOCKS DELAY_MINS
--------- ------- ------------ -------- ------ ------- ---------- ---------- ---------- ----------
RFS         25620 IDLE         ARCH     N/A          0          0          0          0          0
RFS         25617 IDLE         LGWR     2            1        645         43          1          0
ARCH        25587 CLOSING      ARCH     5            1        644          1          1          0

--//檢查歸檔目錄,可以發現日誌已經產生過來.
$ ls -l /u01/app/oracle/archivelog/book
total 92240
-rw-r----- 1 oracle oinstall 46585344 2017-02-16 22:00:17 1_637_896605872.dbf
-rw-r----- 1 oracle oinstall 38691840 2017-02-17 06:03:40 1_638_896605872.dbf
-rw-r----- 1 oracle oinstall 8673280 2017-02-17 08:53:03 1_639_896605872.dbf
-rw-r----- 1 oracle oinstall   197632 2017-02-17 08:53:10 1_640_896605872.dbf
-rw-r----- 1 oracle oinstall    13312 2017-02-17 08:53:29 1_641_896605872.dbf
-rw-r----- 1 oracle oinstall    79360 2017-02-17 08:56:04 1_642_896605872.dbf
-rw-r----- 1 oracle oinstall     1536 2017-02-17 08:56:05 1_643_896605872.dbf
-rw-r----- 1 oracle oinstall     1024 2017-02-17 08:56:05 1_644_896605872.dbf
-rw-r----- 1 oracle oinstall    50176 2017-02-17 08:57:35 1_645_896605872.dbf
-rw-r----- 1 oracle oinstall     1536 2017-02-17 08:57:35 1_646_896605872.dbf
-rw-r----- 1 oracle oinstall     2048 2017-02-17 08:57:37 1_647_896605872.dbf

--//實際上很簡單.就是省略了在備庫建立資料檔案的過程.

[20170217]歸檔收集器.txt

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