分类目录归档：数据库

使用dd复制asm中文件

发表于 2012 年 4 月 29 日由惜分飞

随着数据库新版本的推广ASM肯定会越来越被重视,最近准备系统的学习下ASM,以备突发情况需要,这是asm深入学习第一篇,参考:dd复制ASM中的datafile
查询ASM某个数据文件AU信息

SQL> SELECT GROUP_NUMBER, FILE_NUMBER, NAME 
  2      FROM v$asm_alias
  3  WHERE NAME LIKE '%USER%'
  4   GROUP BY GROUP_NUMBER, FILE_NUMBER, NAME;

GROUP_NUMBER FILE_NUMBER NAME
------------ ----------- -----------------------------
           2         259 USERS.259.776961317


SQL>  SELECT disk_kffxp, au_kffxp, xnum_kffxp
  2    FROM x$kffxp                      
  3     WHERE GROUP_KFFXP=2 
  4    AND NUMBER_KFFXP=259; 

DISK_KFFXP   AU_KFFXP XNUM_KFFXP
---------- ---------- ----------
         1        817          0
         0        507          1
         1        818          2
         0        508          3
         1        819          4
         1        820          5

SQL> select DISK_NUMBER,GROUP_NUMBER,PATH from v$asm_disk 
   2 where GROUP_NUMBER=2 and DISK_NUMBER in(1,0);

DISK_NUMBER GROUP_NUMBER PATH
----------- ------------ -----------------------------------
          1            2 /dev/oracleasm/disks/VOL4
          0            2 /dev/oracleasm/disks/VOL3

查询ASM DISK对应的磁盘或者分区

[grid@rac1 ~]$ /etc/init.d/oracleasm querydisk -d VOL3
Disk "VOL3" is a valid ASM disk on device [8,17]
[grid@rac1 ~]$ /etc/init.d/oracleasm querydisk -d VOL4
Disk "VOL4" is a valid ASM disk on device [8,18]
[grid@rac1 ~]$ cat /proc/partitions |grep "8       17"
   8       17    2409718 sdb1
[grid@rac1 ~]$ cat /proc/partitions |grep "8       18"
   8       18    3879697 sdb2

dd操作磁盘或者分区

[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=1 skip=817 of=/tmp/user_1.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.188362 seconds, 5.6 MB/s
[root@rac1 ~]# dd if=/dev/sdb1 bs=1024k count=1 skip=507 of=/tmp/user_2.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.259001 seconds, 4.0 MB/s
[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=1 skip=818 of=/tmp/user_3.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.182559 seconds, 5.7 MB/s
[root@rac1 ~]# dd if=/dev/sdb1 bs=1024k count=1 skip=508 of=/tmp/user_4.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.10011 seconds, 10.5 MB/s
[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=2 skip=819 of=/tmp/user_5.dbf
2+0 records in
2+0 records out
2097152 bytes (2.1 MB) copied, 0.22389 seconds, 9.4 MB/s
[root@rac1 ~]# ll /tmp/user_*
-rw-r--r-- 1 root root 1048576 Apr 29 18:50 /tmp/user_1.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_2.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_3.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_4.dbf
-rw-r--r-- 1 root root 2097152 Apr 29 18:51 /tmp/user_5.dbf
[root@rac1 ~]# dd if=/tmp/user_1.dbf bs=1024k count=1 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0104619 seconds, 100 MB/s
[root@rac1 ~]# dd if=/tmp/user_2.dbf bs=1024k count=1 seek=1 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0129077 seconds, 81.2 MB/s
[root@rac1 ~]# dd if=/tmp/user_3.dbf bs=1024k count=1 seek=2 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00737324 seconds, 142 MB/s
[root@rac1 ~]# dd if=/tmp/user_4.dbf bs=1024k count=1 seek=3 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0143482 seconds, 73.1 MB/s
[root@rac1 ~]# dd if=/tmp/user_5.dbf bs=1024k count=2 seek=4 of=/tmp/user_dd.dbf
2+0 records in
2+0 records out
2097152 bytes (2.1 MB) copied, 0.0809296 seconds, 25.9 MB/s
[root@rac1 ~]# ll /tmp/user_*
-rw-r--r-- 1 root root 1048576 Apr 29 18:50 /tmp/user_1.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_2.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_3.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_4.dbf
-rw-r--r-- 1 root root 2097152 Apr 29 18:51 /tmp/user_5.dbf
-rw-r--r-- 1 root root 5242880 Apr 29 18:54 /tmp/user_dd.dbf
[root@rac1 ~]# chown oracle.oinstall /tmp/user_dd.dbf 
[root@rac1 ~]# ll /tmp/user_*
-rw-r--r-- 1 root   root     1048576 Apr 29 18:50 /tmp/user_1.dbf
-rw-r--r-- 1 root   root     1048576 Apr 29 18:51 /tmp/user_2.dbf
-rw-r--r-- 1 root   root     1048576 Apr 29 18:51 /tmp/user_3.dbf
-rw-r--r-- 1 root   root     1048576 Apr 29 18:51 /tmp/user_4.dbf
-rw-r--r-- 1 root   root     2097152 Apr 29 18:51 /tmp/user_5.dbf
-rw-r--r-- 1 oracle oinstall 6291456 Apr 29 18:55 /tmp/user_dd.dbf

验证dd拷贝数据文件

[oracle@rac1 ~]$ dbv file='/tmp/user_dd.dbf' 

DBVERIFY: Release 11.2.0.3.0 - Production on Sun Apr 29 18:56:31 2012

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /tmp/user_dd.dbf


DBVERIFY - Verification complete

Total Pages Examined         : 640
Total Pages Processed (Data) : 15
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 2
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 590
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 33
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 782778 (0.782778)
[oracle@rac1 ~]$ dbv userid=sys/xifenfei file='+XIFENFEI/xff/datafile/users.259.776961317' 
> blocksize=8192

DBVERIFY: Release 11.2.0.3.0 - Production on Sun Apr 29 18:58:13 2012

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = +XIFENFEI/xff/datafile/users.259.776961317


DBVERIFY - Verification complete

Total Pages Examined         : 640
Total Pages Processed (Data) : 15
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 2
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 590
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 33
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 0 (0.0)

发表在 Oracle ASM | 评论关闭

DB2 主要表级锁模拟

发表于 2012 年 4 月 29 日由惜分飞

模拟X锁

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326
T_03XFF                         DB2INST1        T     2012-04-11-21.33.12.479480

  3 record(s) selected.

[db2inst1@xifenfei ~]$ db2 +c "lock table t_01xff in exclusive mode"
DB20000I  The SQL command completed successfully.

[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:28:32 -- Date 2012-04-29-01.08.18.056347

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg
0x99B43210 7          53514C4332473137315992A241 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B42F30 7          00000500076D0D0010FB3F9F43 CatCache   ..S  G   7          1   0          0x00 0x40000000 
0x99B43240 7          53514C4445464C5428DD630641 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B430F0 7          02000400000000000000000054 Table      ..X  G   7          255 0          0x00 0x40000000 
--还有db2内部P锁和CatCache锁

[db2inst1@xifenfei ~]$ db2 commit
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:28:44 -- Date 2012-04-29-01.08.30.152903

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg

模拟S锁

[db2inst1@xifenfei ~]$ db2 +c "lock table t_01xff in share mode"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:29:23 -- Date 2012-04-29-01.09.09.610865

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg
0x99B43240 7          53514C4332473137315992A241 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B43030 7          00000500076D0D0010FB3F9F43 CatCache   ..S  G   7          1   0          0x00 0x40000000 
0x99B431B0 7          02000400000000000000000054 Table      ..S  G   7          255 0          0x00 0x40000000 
[db2inst1@xifenfei ~]$ db2 commit
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:29:41 -- Date 2012-04-29-01.09.27.402678

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg

模拟Z锁

[db2inst1@xifenfei ~]$ db2 +c drop table t_02xff
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:31:14 -- Date 2012-04-29-01.11.00.399066

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg
0x99B41270 7          000006000E006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42870 7          00000600010071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42CF0 7          0100000000000000B0FA119F43 CatCache   ..X  G   7          255 0          0x00 0x40000000 
0x99B43240 7          53514C4332473137315992A241 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B418D0 7          00000600000070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B424B0 7          00000600060071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B415D0 7          00000600050070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42090 7          000006000B0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41AB0 7          0000060004006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B412D0 7          000006000A0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42930 7          00000600100071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42ED0 7          00000C0107004C030000000052 Row        ..S  G   7          2   0          0x10 0x40000000 
0x99B41A50 7          0000060003006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B425D0 7          0000060009006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B420C0 7          000006000F0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42750 7          0000060008006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42630 7          000006000E006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B425A0 7          00000600010072360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41F30 7          000006000D006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41B70 7          00000600000071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B40CF0 7          0200000000000000000000004F ObjTab     .IN  G   7          255 0          0x00 0x40000000 
0x99B41C60 7          00000600050071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41630 7          00000600040070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42390 7          000006000A0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42030 7          0000060003006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B416F0 7          00000600090070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41690 7          000006000F0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41990 7          0000060008006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B429F0 7          000006000E0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B426F0 7          0000060007006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41E10 7          000006000D006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B428D0 7          00000600000072360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42E40 7          000006000C006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42B10 7          00001101100057120000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41CC0 7          00000600040071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B417B0 7          000006000F00CE1A0000000052 Row        ..X  G   7          1   0          0x00 0x40000000 
0x99B42960 7          00000600030070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B422D0 7          00000600090071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41570 7          000006000F0072360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41B10 7          0000060002006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41510 7          00000600080070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B413F0 7          000006000E0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B40E70 7          00000E006E003B010000000052 Row        ..S  G   7          1   0          0x10 0x40000000 
0x99B41150 7          0000060001006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41BD0 7          0000060007006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42540 7          000006000D0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41210 7          0000060006006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41E70 7          000006000C006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B43090 7          00000500076E0D00B0FA119F43 CatCache   ..X  G   7          255 0          0x00 0x40000000 
0x99B421B0 7          000006000B006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42C30 7          000013000A00C81A0000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B427B0 7          00000600030071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42D50 7          00000A00080063000000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41870 7          00000600020070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B423F0 7          00000600080071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42690 7          0000060001006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B40F30 7          00000600070070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41DB0 7          000006000D0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B410F0 7          0000060000006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41F90 7          0000060006006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42A50 7          000006000C0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B40F90 7          0000060005006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41ED0 7          000006000B006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41750 7          00000600110070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B414B0 7          000006000A006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B411B0 7          0000060010006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42450 7          000006000F006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B40DB0 7          02000000000000000000000070 Pool       .IX  G   7          255 0          0x00 0x40000000 
0x99B42810 7          00000600020071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42F90 7          0000050007006E0D0000000052 Row        ..X  G   7          7   0          0x20 0x40000000 
0x99B41CF0 7          00000600010070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42330 7          00000600070071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41030 7          0000060000006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41D50 7          00000600060070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41810 7          000006000C0071360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41090 7          0000060005006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42270 7          000006000B0070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B419F0 7          0000060004006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41330 7          000006000A006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42210 7          00000600100070360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B41450 7          0000060009006E360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42150 7          000006000F006F360000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B42C90 7          00001300000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
0x99B43210 7          00000C01000000000000000054 Table      .IS  G   7          2   0          0x10 0x40000000 
0x99B42BD0 7          00000E01000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
0x99B430F0 7          00000500000000000000000054 Table      .IX  G   7          7   0          0x00 0x40000000 
0x99B42AB0 7          00000600000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
0x99B42B70 7          00001101000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
0x99B42E70 7          00000800000000000000000054 Table      .IX  G   7          2   0          0x00 0x40000000 
0x99B42DE0 7          00000A00000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
0x99B40D50 7          02000500000000000000000054 Table      ..Z  G   7          255 0          0x00 0x40000000 
0x99B40E10 7          00000C00000000000000000054 Table      .IS  G   7          1   0          0x00 0x40000000 
0x99B40ED0 7          00000E00000000000000000054 Table      .IS  G   7          1   0          0x10 0x40000000 
0x99B413C0 7          00000801000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 
--除了Z锁之外,因为DDL操作会修改系统表,因此还出现很多在系统表上表锁和行锁

[db2inst1@xifenfei ~]$ db2 rollback
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:31:41 -- Date 2012-04-29-01.11.27.194147

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg

模拟IX锁

[db2inst1@xifenfei ~]$ db2 +c "DELETE FROM T_02XFF where tabname LIKE 'T_%XFF'"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:43:47 -- Date 2012-04-29-01.23.33.163605

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg
0x99B3A510 7          53514C4332473137315992A241 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B40C30 7          0200050008006F010000000052 Row        ..X  G   7          1   0          0x20 0x40000000 
0x99B3A4B0 7          02000500000000000000000054 Table      .IX  G   7          1   0          0x00 0x40000000 

[db2inst1@xifenfei ~]$ db2 rollback
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:45:06 -- Date 2012-04-29-01.24.52.429166

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg

模拟SIX锁

[db2inst1@xifenfei ~]$ db2 +c "lock table t_01xff in share mode"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 +c "DELETE FROM T_01XFF"
SQL0100W  No row was found for FETCH, UPDATE or DELETE; or the result of a 
query is an empty table.  SQLSTATE=02000
[db2inst1@xifenfei ~]$ db2pd -d xifenfei -locks

Database Partition 0 -- Database XIFENFEI -- Active -- Up 0 days 01:39:47 -- Date 2012-04-29-01.19.33.620920

Locks:
Address    TranHdl    Lockname                   Type       Mode Sts Owner      Dur HoldCount  Att  ReleaseFlg
0x99B40E10 7          53514C4332473137315992A241 Internal P ..S  G   7          1   0          0x00 0x40000000 
0x99B40C30 7          00000500076D0D0010FB3F9F43 CatCache   ..S  G   7          5   0          0x00 0x40000000 
0x99B40D50 7          02000400FFFF01000000000052 Row        ..S  G   7          1   0          0x10 0x00000001 
0x99B431B0 7          02000400000000000000000054 Table      SIX  G   7          255 0          0x10 0x40000001

因为IS锁不太好模拟,在本实验中没有体现出来,其本质就是数据库在select查询数据库时给表加的一个表级锁.

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DB2 runstats和reorg操作

发表于 2012 年 4 月 29 日由惜分飞

db2收集统计信息(runstats)

[db2inst1@xifenfei ~]$ db2 connect to xff

   Database Connection Information

 Database server        = DB2/LINUX 9.5.9
 SQL authorization ID   = DB2INST1
 Local database alias   = XFF

[db2inst1@xifenfei ~]$ db2 list tables

Table/View                      Schema          Type  Creation time             
------------------------------- --------------- ----- --------------------------
T_01XFF                         DB2INST1        T     2012-04-11-18.23.05.723478
T_02XFF                         DB2INST1        T     2012-04-11-18.30.26.639326
T_03XFF                         DB2INST1        T     2012-04-11-21.33.12.479480

  3 record(s) selected.

[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF','T_03XFF')"

STATS_TIME                
--------------------------
2012-04-12-04.35.07.539790
2012-04-11-19.55.12.023748
2012-04-11-22.20.07.016905

  3 record(s) selected.

--收集表和索引统计信息,包括数据分布
[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_01xff on all columns
with distribution and detailed indexes all"
DB20000I  The RUNSTATS command completed successfully.
[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF')"

STATS_TIME                
--------------------------
2012-04-28-23.43.23.904759

  1 record(s) selected.

--收集索引统计信息,如果表没有被收集,也会同时对表收集统计信息,对不会收集数据分布信息
[db2inst1@xifenfei ~]$ db2 "runstats on table db2inst1.t_02xff for  indexes all"
DB20000I  The RUNSTATS command completed successfully.


[db2inst1@xifenfei ~]$ db2 "select STATS_TIME from syscat.tables where tabname in('T_01XFF','T_02XFF')"

STATS_TIME                
--------------------------
2012-04-28-23.43.23.904759
2012-04-28-23.44.39.762858

  2 record(s) selected.

db2 reorg操作

--删除部分表数据
[db2inst1@xifenfei ~]$ db2 "delete from t_01xff"
DB20000I  The SQL command completed successfully.
[db2inst1@xifenfei ~]$ db2 "delete from t_03xff"
DB20000I  The SQL command completed successfully.

--reorgchk检查是否需要进行reorg
[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1

Doing RUNSTATS ....


Table statistics:

F1: 100 * OVERFLOW / CARD < 5
F2: 100 * (Effective Space Utilization of Data Pages) > 70
F3: 100 * (Required Pages / Total Pages) > 80

SCHEMA.NAME                     CARD     OV     NP     FP ACTBLK    TSIZE  F1  F2  F3 REORG
----------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
                                   0      0      0     42      -        0   0   0   0 -** 
Table: DB2INST1.T_02XFF
                                 371      0     42     42      -   152110   0 100 100 --- 
Table: DB2INST1.T_03XFF
                                   0      0      0     83      -        0   0   0   0 -** 
----------------------------------------------------------------------------------------

Index statistics:

F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80
F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))
F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100
F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20
F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20

SCHEMA.NAME                 INDCARD  LEAF ELEAF LVLS  NDEL    KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD  F4  F5  F6  F7  F8 REORG  
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
Index: DB2INST1.I_T_01XFF
                                  0     3     3    2     0       0            2             2                822                 822 100   0   -   0 100 ----* 
--------------------------------------------------------------------------------------------------------------------------------------------------------------

CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary 
for indexes that are not in the same sequence as the base table. When multiple 
indexes are defined on a table, one or more indexes may be flagged as needing 
REORG.  Specify the most important index for REORG sequencing.

Tables defined using the ORGANIZE BY clause and the corresponding dimension 
indexes have a '*' suffix to their names. The cardinality of a dimension index 
is equal to the Active blocks statistic of the table.

--离线reorg index
[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff index DB2INST1.I_T_01XFF allow read access
DB20000I  The REORG command completed successfully.

--在线reorg table
[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_01xff inplace allow write access
DB20000I  The REORG command completed successfully.
DB21024I  This command is asynchronous and may not be effective immediately.

[db2inst1@xifenfei ~]$ db2 reorg table db2inst1.t_03xff inplace allow write access
DB20000I  The REORG command completed successfully.
DB21024I  This command is asynchronous and may not be effective immediately.

--证明异步操作完成
[db2inst1@xifenfei ~]$ ps -ef|grep db2reo
db2inst1  1496  1311  0 00:24 pts/1    00:00:00 grep db2reo

--检查reorg操作结果
[db2inst1@xifenfei ~]$ db2 reorgchk on schema db2inst1

Doing RUNSTATS ....


Table statistics:

F1: 100 * OVERFLOW / CARD < 5
F2: 100 * (Effective Space Utilization of Data Pages) > 70
F3: 100 * (Required Pages / Total Pages) > 80

SCHEMA.NAME                     CARD     OV     NP     FP ACTBLK    TSIZE  F1  F2  F3 REORG
----------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
                                   0      0      0      1      -        0   0   -   0 --- 
Table: DB2INST1.T_02XFF
                                 371      0     42     42      -   152110   0 100 100 --- 
Table: DB2INST1.T_03XFF
                                   0      0      0      1      -        0   0   -   0 --- 
----------------------------------------------------------------------------------------

Index statistics:

F4: CLUSTERRATIO or normalized CLUSTERFACTOR > 80
F5: 100 * (Space used on leaf pages / Space available on non-empty leaf pages) > MIN(50, (100 - PCTFREE))
F6: (100 - PCTFREE) * (Amount of space available in an index with one less level / Amount of space required for all keys) < 100
F7: 100 * (Number of pseudo-deleted RIDs / Total number of RIDs) < 20
F8: 100 * (Number of pseudo-empty leaf pages / Total number of leaf pages) < 20

SCHEMA.NAME                 INDCARD  LEAF ELEAF LVLS  NDEL    KEYS LEAF_RECSIZE NLEAF_RECSIZE LEAF_PAGE_OVERHEAD NLEAF_PAGE_OVERHEAD  F4  F5  F6  F7  F8 REORG  
--------------------------------------------------------------------------------------------------------------------------------------------------------------
Table: DB2INST1.T_01XFF
Index: DB2INST1.I_T_01XFF
                                  0     1     0    1     0       0            2             2                822                 822 100   -   -   0   0 ----- 
--------------------------------------------------------------------------------------------------------------------------------------------------------------

CLUSTERRATIO or normalized CLUSTERFACTOR (F4) will indicate REORG is necessary 
for indexes that are not in the same sequence as the base table. When multiple 
indexes are defined on a table, one or more indexes may be flagged as needing 
REORG.  Specify the most important index for REORG sequencing.

Tables defined using the ORGANIZE BY clause and the corresponding dimension 
indexes have a '*' suffix to their names. The cardinality of a dimension index 
is equal to the Active blocks statistic of the table.

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