fast_start_parallel_rollback引數的一點測試
oracle從8i就引入的引數fast_start_parallel_rollback旨在解決由於session或者程式中斷從而縮短回滾大事務所需要的時間問題，不過透過測試發現當fast_start_parallel_rollback=low時觀察不到oracle啟動多個paralle process，當fast_start_parallel_rollback=high時oracle確實啟動了4×cpu_count個parallel process，但是幾乎觀察不到有多個process paralle來恢復事務，也許被恢復的事務還不夠大、所需的時間還不夠長，似乎不是；也許oracle認為使用smon一個程式恢復時間更快？
[@more@]C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 22:44:17 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select sid from v$mystat where rownum=1;
SID
----------
153
SQL> select sid,serial#,paddr,status from v$session where sid=153;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
153 26 6FA4BA1C ACTIVE
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 1496
SQL> select count(*) from t;
COUNT(*)
----------
11540
SQL> insert into t select * from t;
已建立11540行。
SQL> insert into t select * from t;
已建立23080行。
SQL> insert into t select * from t;
已建立46160行。
SQL> insert into t select * from t;
已建立92320行。
SQL> insert into t select * from t;
已建立184640行。
SQL> insert into t select * from t;
已建立369280行。
SQL> select xid from v$transaction;
XID
----------------
08002D000E030000
--===========================================
session 2:
SQL> alter system kill session '153,26';
系統已更改。
SQL> select sid,serial#,paddr,status from v$session where sid=153;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
153 26 6FA7F358 KILLED
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 1496
SQL> desc v$fast_start_transactions
名稱 是否為空? 型別
----------------------------------------- -------- ----------------------------
USN NUMBER
SLT NUMBER
SEQ NUMBER
STATE VARCHAR2(16)
UNDOBLOCKSDONE NUMBER
UNDOBLOCKSTOTAL NUMBER
PID NUMBER
CPUTIME NUMBER
PARENTUSN NUMBER
PARENTSLT NUMBER
PARENTSEQ NUMBER
XID RAW(8)
PXID RAW(8)
RCVSERVERS NUMBER
SQL> desc v$fast_start_servers
名稱 是否為空? 型別
----------------------------------------- -------- ----------------------------
STATE VARCHAR2(11)
UNDOBLOCKSDONE NUMBER
PID NUMBER
XID RAW(8)
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERED 08002D000E030000 1
SQL> select * from v$fast_start_servers;
未選定行
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string LOW
SQL> show parameter cpu
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cpu_count integer 1
parallel_threads_per_cpu integer 2
SQL>
--在smon的trc檔案中發現了下面的資訊：
--==========================
Windows thread id: 512, image: ORACLE.EXE (SMON)
*** 2009-11-20 22:26:47.203
*** SERVICE NAME:(SYS$BACKGROUND) 2009-11-20 22:26:47.156
*** SESSION ID:(164.1) 2009-11-20 22:26:47.156
Dead transaction 0x0008.02d.0000030e recovered by 1 server(s)
*** 2009-11-20 22:50:48.265
SMON: Parallel transaction recovery tried
--=============================
C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 22:59:38 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select sid from v$mystat where rownum=1;
SID
----------
153
SQL> select sid,serial#,paddr,status from v$session where sid=153;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
153 28 6FA4BA1C ACTIVE
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2532
SQL> select count(*) from t;
COUNT(*)
----------
11540
SQL> insert into t select * from t;
已建立11540行。
SQL> insert into t select * from t;
已建立23080行。
SQL> insert into t select * from t;
已建立46160行。
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
test
--==============================
--嘗試殺掉thread
C:>orakill test 2532
Kill of thread id 2532 in instance test successfully signalled.
--==============================
--奇怪的是居然沒有殺掉
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2532
SQL> select sid,serial#,paddr,status from v$session where sid=153;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
153 28 6FA4BA1C ACTIVE
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2532
--========================
C:>orakill test 2532
Kill of thread id 2532 in instance test successfully signalled.
--========================
--這次是殺掉了
SQL> select pid,spid from v$process where addr='6FA4BA1C';
select pid,spid from v$process where addr='6FA4BA1C'
*
第 1 行出現錯誤:
ORA-03113: 通訊通道的檔案結束
SQL> exit
從 Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options 斷開
C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 23:04:21 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select count(*) from t;
COUNT(*)
----------
11540
SQL>
--重新連線發現事務rollback了，插入而沒有提及的資料不見了，在smon對應
的trace檔案中發現了rollback資訊：
--============================
Dead transaction 0x0006.02a.0000031c recovered by 1 server(s)
*** 2009-11-20 23:03:37.843
SMON: Parallel transaction recovery tried
--============================
--再次嘗試恢復時間長一些的事務看看是否啟動parallel事務恢復：
C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 23:04:21 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select count(*) from t;
COUNT(*)
----------
11540
SQL> select sid from v$mystat where rownum=1;
SID
----------
159
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 22 6FA4D7CC ACTIVE
SQL> select pid,spid from v$process where addr='6FA4D7CC';
PID SPID
---------- ------------
18 3044
SQL> select count(*) from t;
COUNT(*)
----------
11540
SQL> insert into t select * from t;
已建立11540行。
SQL> insert into t select * from t;
已建立23080行。
SQL> insert into t select * from t;
已建立46160行。
SQL> insert into t select * from t;
已建立92320行。
SQL> insert into t select * from t;
已建立184640行。
SQL> insert into t select * from t;
已建立369280行。
SQL> commit;
提交完成。
SQL> delete from t;
已刪除738560行。
SQL>
--==============================
session 2:
SQL> alter system kill session '159,22';
系統已更改。
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 16 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 1030 16 02002F001B030000
SQL> select pid,spid from v$process where addr='6FA4D7CC';
PID SPID
---------- ------------
18 3044
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 22 6FA7F358 KILLED
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 3877 16 02002F001B030000
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 16 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 16 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 7549 16 02002F001B030000
--smon的trace資訊：
--======================
Dead transaction 0x0002.02f.0000031b recovered by 1 server(s)
*** 2009-11-20 23:16:14.421
SMON: Parallel transaction recovery tried
--=======================
--修改fast_start_parallel_rollback=high
C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 23:27:30 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select sid from v$mystat where rownum=1;
SID
----------
159
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 24 6FA4CBEC ACTIVE
SQL> select pid,spid from v$process where addr='6FA4CBEC';
PID SPID
---------- ------------
16 2332
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string LOW
SQL> alter system set fast_start_parallel_rollback=high;
系統已更改。
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string HIGH
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 24 6FA4CBEC ACTIVE
SQL> select pid,spid from v$process where addr='6FA4CBEC';
PID SPID
---------- ------------
16 2332
SQL> select count(*) from t;
COUNT(*)
----------
738560
SQL> delete from t;
已刪除738560行。
SQL>
--====================
session 2:
SQL> alter system kill session '159,24';
系統已更改。
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 18 0400170019030000 4
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 1204 18 0400170019030000
RECOVERING 0 19 0400170019030000
RECOVERING 0 20 0400170019030000
RECOVERING 0 21 0400170019030000
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 2908 18 0400170019030000
RECOVERING 0 19 0400170019030000
RECOVERING 0 20 0400170019030000
RECOVERING 0 21 0400170019030000
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 3444 18 0400170019030000
RECOVERING 0 19 0400170019030000
RECOVERING 0 20 0400170019030000
RECOVERING 0 21 0400170019030000
SQL> select pid,spid from v$process where addr='6FA4CBEC';
PID SPID
---------- ------------
16 2332
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 24 6FA7F358 KILLED
SQL> select program from v$process where program like '%P00%';
PROGRAM
----------------------------------------------------------------
ORACLE.EXE (P000)
ORACLE.EXE (P001)
ORACLE.EXE (P002)
ORACLE.EXE (P003)
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 12358 18 0400170019030000
RECOVERING 0 19 0400170019030000
RECOVERING 0 20 0400170019030000
RECOVERING 0 21 0400170019030000
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 18 0400170019030000 4
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select pid,program from v$process where program like '%P00%';
PID PROGRAM
---------- ----------------------------------------------------------------
18 ORACLE.EXE (P000)
19 ORACLE.EXE (P001)
20 ORACLE.EXE (P002)
21 ORACLE.EXE (P003)
--恢復完成了，終於看到了oracle啟動了多個praralle process，但是儘管啟動了
多個程式，事實上還算一個process來恢復，其實這樣恢復時間可能會更長...
SQL> select * from v$fast_start_servers;
未選定行
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 0400170019030000 4
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
SQL> select pid,program from v$process where program like '%P00%';
PID PROGRAM
---------- ----------------------------------------------------------------
18 ORACLE.EXE (P000)
19 ORACLE.EXE (P001)
20 ORACLE.EXE (P002)
21 ORACLE.EXE (P003)
SQL>
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string HIGH
SQL>
在smon的trace檔案中也看到了4個server(s)的提示資訊：
--=============================
Dead transaction 0x0004.017.00000319 recovered by 4 server(s)
*** 2009-11-20 23:34:11.718
SMON: Parallel transaction recovery tried
--==========================
--嘗試在事務恢復的過程中殺掉process：
session 1：
C:>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on 星期五 11月 20 23:43:03 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
連線到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> select sid from v$mystat where rownum=1;
SID
----------
159
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 26 6FA4BA1C ACTIVE
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2072
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string HIGH
SQL> select count(*) from t;
COUNT(*)
----------
738560
SQL> delete from t;
已刪除738560行。
SQL>
--============================
session 2：
SQL> alter system kill session '159,26';
系統已更改。
SQL> select pid,program from v$process where program like '%P00%';
PID PROGRAM
---------- ----------------------------------------------------------------
18 ORACLE.EXE (P000)
19 ORACLE.EXE (P001)
20 ORACLE.EXE (P002)
21 ORACLE.EXE (P003)
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 18 0A0011001E030000 4
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 0400170019030000 4
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
已選擇6行。
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 2451 18 0A0011001E030000
RECOVERING 0 19 0A0011001E030000
RECOVERING 0 20 0A0011001E030000
RECOVERING 0 21 0A0011001E030000
--=========================
--連續多次執行下面語句，保證一定要殺掉thread：2072
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>orakill test 2072
Kill of thread id 2072 in instance test successfully signalled.
C:>
--=========================
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 26 6FA7F358 KILLED
--kill 程式之後很顯然session對應的程式的地址由6FA4BA1C變成了6FA7F358，
而地址6FA7F358所對應的程式其實並不存在，真真存在的程式是6FA4BA1C，但是6FA4BA1C
不在能為session 159服務了...
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 5533 18 0A0011001E030000
RECOVERING 0 19 0A0011001E030000
RECOVERING 0 20 0A0011001E030000
RECOVERING 0 21 0A0011001E030000
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 18 0A0011001E030000 1
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 0400170019030000 4
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
已選擇6行。
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 26 6FA7F358 KILLED
SQL> select pid,spid from v$process where addr='6FA7F358';
未選定行
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2072
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERING 18 0A0011001E030000 4
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 0400170019030000 4
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
已選擇6行。
SQL> select * from v$fast_start_servers;
STATE UNDOBLOCKSDONE PID XID
----------- -------------- ---------- ----------------
RECOVERING 14144 18 0A0011001E030000
RECOVERING 0 19 0A0011001E030000
RECOVERING 0 20 0A0011001E030000
RECOVERING 0 21 0A0011001E030000
SQL> select * from v$fast_start_servers;
未選定行
SQL> select state,pid,xid,rcvservers from v$fast_start_transactions;
STATE PID XID RCVSERVERS
---------------- ---------- ---------------- ----------
RECOVERED 02002F001B030000 1
RECOVERED 0300100012030000 1
RECOVERED 0400170019030000 4
RECOVERED 06002A001C030000 1
RECOVERED 08002D000E030000 1
RECOVERED 0A0011001E030000 4
已選擇6行。
SQL> select sid,serial#,paddr,status from v$session where sid=159;
SID SERIAL# PADDR STATUS
---------- ---------- -------- --------
159 26 6FA7F358 KILLED
SQL> select pid,spid from v$process where addr='6FA7F358';
未選定行
--儘管我們kill掉了session也嘗試kill thread：2072，但是事實上
這個thread一直存在，直到我們用exit退出session 1所在的sqlplus程式
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2072
session 1：
SQL> select count(*) from t;
select count(*) from t
*
第 1 行出現錯誤:
ORA-00028: 您的會話己被終止
--==============
session 2:
SQL> select pid,spid from v$process where addr='6FA4BA1C';
PID SPID
---------- ------------
13 2072
session 1：
SQL> exit
從 Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options 斷開
C:>
--================
session 2:
SQL> select pid,spid from v$process where addr='6FA4BA1C';
未選定行
SQL>
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