Alias Directory
别名目录的ASM文件号为6,它对磁盘组中的所有文件提供了一种层次结构的命名系统。对每个文件创建的系统文件名是基于文件类型，数据库实例与类型特定信息，比如表空间名。当文件创建时如果指定了完整路径名将会生成用户别名。Alias Directory包含所有别名元数据以及每种系统别名，系统目录，用户目录与用户别名。通过别名号进行索引。
别名目录条目包含以下信息：
.Alias name(or directory name)
.Alias incarnation number
.File number
.File incarnation number
.Parent directory
.System flag
Alias Directory在每个磁盘组中的文件号为6(F6)。Alias incarnation number，很像file incarnation number,被用来区分可能重复使用相同别名号的别名或目录。system flag被设置给系统创建的别名与目录，但不对用户创建的别名或目录进行设置。
可以通过查询v$asm_alias视图来获得ASM别名信息。
SQL> select * from v$asm_alias where group_number=3 and file_number<>4294967295; NAME GROUP_NUMBER FILE_NUMBER FILE_INCARNATION ALIAS_INDEX ALIAS_INCARNATION PARENT_INDEX REFERENCE_INDEX ALIAS_DIRECTORY SYSTEM_CREATED ---------------------------------------- ------------ ----------- ---------------- ----------- ----------------- ------------ --------------- -------------------- -------------------- SYSAUX.258.930413055 3 258 930413055 106 1 50331754 67108863 N Y SYSTEM.259.930413057 3 259 930413057 107 1 50331754 67108863 N Y EXAMPLE.260.930413057 3 260 930413057 108 1 50331754 67108863 N Y UNDOTBS2.261.930413057 3 261 930413057 109 1 50331754 67108863 N Y UNDOTBS1.262.930413057 3 262 930413057 110 1 50331754 67108863 N Y USERS.263.930413057 3 263 930413057 111 1 50331754 67108863 N Y FILE_TRANSFER.270.930515465 3 270 930515465 112 1 50331754 67108863 N Y test01.dbf 3 270 930515465 113 1 50331754 67108863 N N CS.271.931880499 3 271 931880499 114 5 50331754 67108863 N Y CS_STRIPE_COARSE.272.931882089 3 272 931882089 115 3 50331754 67108863 N Y NOT_IMPORTANT.273.931882831 3 273 931882831 116 1 50331754 67108863 N Y current.257.930412709 3 257 930412709 159 3 50331807 67108863 N Y group_1.264.930413221 3 264 930413221 265 1 50331913 67108863 N Y group_2.265.930413225 3 265 930413225 266 1 50331913 67108863 N Y group_3.266.930413227 3 266 930413227 267 1 50331913 67108863 N Y group_4.267.930413231 3 267 930413231 268 1 50331913 67108863 N Y TEMP.268.930413239 3 268 930413239 318 1 50331966 67108863 N Y spfilejyrac.ora 3 256 930411925 60 1 50331701 67108863 N N FILE_TRANSFER_0_0.269.930515105 3 269 930515105 583 3 50332231 67108863 N Y SPFILE.256.930411925 3 256 930411925 530 1 50332178 67108863 N Y tts.dmp 3 269 930515105 2 3 50331648 67108863 N N 21 rows selected.
下面查询的输出将包含目录列表，接下来文件的完整路径名列表。并且假设所有文件是使用ASM文件命名规则所创建，在特定情况下，将假设在别名中(full_path列)将会存在指定的数据库名。查询中的full_path变量引用别名。DIR列指示目录，SYS列指示是否由系统创建。
SQL> col full_path format a64
SQL> col dir format a3
SQL> col sys format a3
SQL> set pagesize 1000
SQL> set linesize 200
SQL> select concat ('+'|| gname, sys_connect_by_path (aname,'/')) full_path, dir, sys
2 from (
3 select g.name gname,
4 a.parent_index pindex,
5 a.name aname,
6 a.reference_index rindex,
7 a.alias_directory dir,
8 a.system_created sys
9 from v$asm_alias a, v$asm_diskgroup g
10 where a.group_number = g.group_number and a.group_number=3)
11 start with (mod(pindex, power(2, 24))) = 0
12 connect by prior rindex = pindex
13 order by dir desc, full_path asc;
FULL_PATH DIR SYS
---------------------------------------------------------------- --- ---
+DATADG/DB_UNKNOWN Y Y
+DATADG/DB_UNKNOWN/PARAMETERFILE Y Y
+DATADG/JYRAC Y N
+DATADG/JYRAC/CONTROLFILE Y N
+DATADG/JYRAC/DATAFILE Y N
+DATADG/JYRAC/DUMPSET Y Y
+DATADG/JYRAC/ONLINELOG Y N
+DATADG/JYRAC/PARAMETERFILE Y N
+DATADG/JYRAC/TEMPFILE Y N
+DATADG/JYRAC/oradata Y N
+DATADG/JYRAC/temp_files Y N
+DATADG/DB_UNKNOWN/PARAMETERFILE/SPFILE.256.930411925 N Y
+DATADG/JYRAC/CONTROLFILE/current.257.930412709 N Y
+DATADG/JYRAC/DATAFILE/CS.271.931880499 N Y
+DATADG/JYRAC/DATAFILE/CS_STRIPE_COARSE.272.931882089 N Y
+DATADG/JYRAC/DATAFILE/EXAMPLE.260.930413057 N Y
+DATADG/JYRAC/DATAFILE/FILE_TRANSFER.270.930515465 N Y
+DATADG/JYRAC/DATAFILE/NOT_IMPORTANT.273.931882831 N Y
+DATADG/JYRAC/DATAFILE/SYSAUX.258.930413055 N Y
+DATADG/JYRAC/DATAFILE/SYSTEM.259.930413057 N Y
+DATADG/JYRAC/DATAFILE/UNDOTBS1.262.930413057 N Y
+DATADG/JYRAC/DATAFILE/UNDOTBS2.261.930413057 N Y
+DATADG/JYRAC/DATAFILE/USERS.263.930413057 N Y
+DATADG/JYRAC/DATAFILE/test01.dbf N N
+DATADG/JYRAC/DUMPSET/FILE_TRANSFER_0_0.269.930515105 N Y
+DATADG/JYRAC/ONLINELOG/group_1.264.930413221 N Y
+DATADG/JYRAC/ONLINELOG/group_2.265.930413225 N Y
+DATADG/JYRAC/ONLINELOG/group_3.266.930413227 N Y
+DATADG/JYRAC/ONLINELOG/group_4.267.930413231 N Y
+DATADG/JYRAC/TEMPFILE/TEMP.268.930413239 N Y
+DATADG/JYRAC/spfilejyrac.ora N N
+DATADG/tts.dmp N N
32 rows selected.
别名目录内容其实很重要，因为如果说你需要从asm中抽取数据文件，你起码要知道数据库里面的文件名信息吧？知道了以后，你使用amdu来进行数据文件的抽取，将事半功倍。那么asm alias元数据到底在什么地方呢，如下我们来查询磁盘组3的别名AU分布情况。
SQL> select group_number,name,type from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE
------------ ---------------------------------------- ------------
1 ARCHDG NORMAL
2 CRSDG EXTERN
3 DATADG NORMAL
4 TESTDG NORMAL
SQL> select group_number, disk_number, state, name,failgroup,path from v$asm_disk where group_number=3;
GROUP_NUMBER DISK_NUMBER STATE NAME FAILGROUP PATH
------------ ----------- ------------------------------ ---------------------------------------- ------------------------------ ------------------------------
3 0 NORMAL DATADG_0001 DATADG_0001 /dev/raw/raw11
3 3 NORMAL DATADG_0000 DATADG_0000 /dev/raw/raw10
3 1 NORMAL DATADG_0003 DATADG_0003 /dev/raw/raw4
3 2 NORMAL DATADG_0002 DATADG_0002 /dev/raw/raw3
SQL> select number_kffxp file#, disk_kffxp disk#, count(disk_kffxp) extents
2 from x$kffxp
3 where group_kffxp=3
4 and disk_kffxp <> 65534
5 and number_kffxp=6
6 group by number_kffxp, disk_kffxp
7 order by 1;
FILE# DISK# EXTENTS
---------- ---------- ----------
6 1 1
6 2 1
6 3 1
上面的查询显示别名目录分布在1,2,3号磁盘中，因为磁盘组DATADG是normal冗余，并且故障磁盘组有4个，所以别名目录有3份镜像，下面的查询将会返回别名目录分别存储在1,2,3号磁盘（/dev/raw/raw4,/dev/raw/raw3,/dev/raw/raw10)中的36,38,37号AU中。
SQL> select x.xnum_kffxp "virtual extent",pxn_kffxp "physical extent",x.au_kffxp "au",x.disk_kffxp "disk #",d.name "disk name"
2 from x$kffxp x, v$asm_disk_stat d
3 where x.group_kffxp=d.group_number
4 and x.disk_kffxp=d.disk_number
5 and x.group_kffxp=3
6 and x.number_kffxp=6
7 order by 1,2,3;
virtual extent physical extent au disk # disk name
-------------- --------------- ---------- ---------- ------------------------------------------------------------
0 0 38 2 DATADG_0002
0 1 37 3 DATADG_0000
0 2 36 1 DATADG_0003
通过kfed工具来查询别名目录的分布情况
由于1号文件总是开始在0号磁盘2号AU，记住这个位置：0号盘2号AU。这是ASM中定位文件的起点，它的作用，有点相当于磁盘上的引导区，在电脑开机后负责将OS启动起来。1号文件在最少情况下，至少有两个AU。在1号文件中，每个文件占用一个元数据块，存放自身的空间分布信息。每个元数据块大小是4K，一个AU是1M，哪么，每个AU中，可以存储256个文件的空间分布信息。这其中，0号盘2号AU中，全是元文件的信息。再具体一点，0号盘2号AU，第一个元数据块被系统占用，从第二个块开始，到255为止，共255个元数据块，对应索引号1至255的文件。其实，也就是全部的元文件了。也就是说0号盘2号AU，保存了全部元文件的空间分布信息。1号文件的第二个AU，从第一个块开始，保存256号文件。第二个块对应257号文件，等等。每次从ASM中读数据时，Oracle都要先读到1号文件，从中找出要读的目标文件在磁盘上的分布位置，然后再去读取相应的文件的数据。由于别名目录是6号文件，所以要读取0号磁盘(/dev/raw/raw11)的2号AU的6号块
[grid@jyrac1 ~]$ kfed read /dev/raw/raw11 aun=2 blkn=6 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 4 ; 0x002: KFBTYP_FILEDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 6 ; 0x004: blk=6 kfbh.block.obj: 1 ; 0x008: file=1 kfbh.check: 893084381 ; 0x00c: 0x353b62dd kfbh.fcn.base: 0 ; 0x010: 0x00000000 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kfffdb.node.incarn: 1 ; 0x000: A=1 NUMM=0x0 kfffdb.node.frlist.number: 4294967295 ; 0x004: 0xffffffff kfffdb.node.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kfffdb.hibytes: 0 ; 0x00c: 0x00000000 kfffdb.lobytes: 1048576 ; 0x010: 0x00100000 kfffdb.xtntcnt: 3 ; 0x014: 0x00000003 kfffdb.xtnteof: 3 ; 0x018: 0x00000003 kfffdb.blkSize: 4096 ; 0x01c: 0x00001000 kfffdb.flags: 1 ; 0x020: O=1 S=0 S=0 D=0 C=0 I=0 R=0 A=0 kfffdb.fileType: 15 ; 0x021: 0x0f kfffdb.dXrs: 19 ; 0x022: SCHE=0x1 NUMB=0x3 kfffdb.iXrs: 19 ; 0x023: SCHE=0x1 NUMB=0x3 kfffdb.dXsiz[0]: 4294967295 ; 0x024: 0xffffffff kfffdb.dXsiz[1]: 0 ; 0x028: 0x00000000 kfffdb.dXsiz[2]: 0 ; 0x02c: 0x00000000 kfffdb.iXsiz[0]: 4294967295 ; 0x030: 0xffffffff kfffdb.iXsiz[1]: 0 ; 0x034: 0x00000000 kfffdb.iXsiz[2]: 0 ; 0x038: 0x00000000 kfffdb.xtntblk: 3 ; 0x03c: 0x0003 kfffdb.break: 60 ; 0x03e: 0x003c kfffdb.priZn: 0 ; 0x040: KFDZN_COLD kfffdb.secZn: 0 ; 0x041: KFDZN_COLD kfffdb.ub2spare: 0 ; 0x042: 0x0000 kfffdb.alias[0]: 4294967295 ; 0x044: 0xffffffff kfffdb.alias[1]: 4294967295 ; 0x048: 0xffffffff kfffdb.strpwdth: 0 ; 0x04c: 0x00 kfffdb.strpsz: 0 ; 0x04d: 0x00 kfffdb.usmsz: 0 ; 0x04e: 0x0000 kfffdb.crets.hi: 33042831 ; 0x050: HOUR=0xf DAYS=0xc MNTH=0xc YEAR=0x7e0 kfffdb.crets.lo: 2457465856 ; 0x054: USEC=0x0 MSEC=0x27d SECS=0x27 MINS=0x24 kfffdb.modts.hi: 33042831 ; 0x058: HOUR=0xf DAYS=0xc MNTH=0xc YEAR=0x7e0 kfffdb.modts.lo: 2457465856 ; 0x05c: USEC=0x0 MSEC=0x27d SECS=0x27 MINS=0x24 kfffdb.dasz[0]: 0 ; 0x060: 0x00 kfffdb.dasz[1]: 0 ; 0x061: 0x00 kfffdb.dasz[2]: 0 ; 0x062: 0x00 kfffdb.dasz[3]: 0 ; 0x063: 0x00 kfffdb.permissn: 0 ; 0x064: 0x00 kfffdb.ub1spar1: 0 ; 0x065: 0x00 kfffdb.ub2spar2: 0 ; 0x066: 0x0000 kfffdb.user.entnum: 0 ; 0x068: 0x0000 kfffdb.user.entinc: 0 ; 0x06a: 0x0000 kfffdb.group.entnum: 0 ; 0x06c: 0x0000 kfffdb.group.entinc: 0 ; 0x06e: 0x0000 kfffdb.spare[0]: 0 ; 0x070: 0x00000000 kfffdb.spare[1]: 0 ; 0x074: 0x00000000 kfffdb.spare[2]: 0 ; 0x078: 0x00000000 kfffdb.spare[3]: 0 ; 0x07c: 0x00000000 kfffdb.spare[4]: 0 ; 0x080: 0x00000000 kfffdb.spare[5]: 0 ; 0x084: 0x00000000 kfffdb.spare[6]: 0 ; 0x088: 0x00000000 kfffdb.spare[7]: 0 ; 0x08c: 0x00000000 kfffdb.spare[8]: 0 ; 0x090: 0x00000000 kfffdb.spare[9]: 0 ; 0x094: 0x00000000 kfffdb.spare[10]: 0 ; 0x098: 0x00000000 kfffdb.spare[11]: 0 ; 0x09c: 0x00000000 kfffdb.usm: ; 0x0a0: length=0 kfffde[0].xptr.au: 38 ; 0x4a0: 0x00000026 kfffde[0].xptr.disk: 2 ; 0x4a4: 0x0002 kfffde[0].xptr.flags: 0 ; 0x4a6: L=0 E=0 D=0 S=0 kfffde[0].xptr.chk: 14 ; 0x4a7: 0x0e kfffde[1].xptr.au: 37 ; 0x4a8: 0x00000025 kfffde[1].xptr.disk: 3 ; 0x4ac: 0x0003 kfffde[1].xptr.flags: 0 ; 0x4ae: L=0 E=0 D=0 S=0 kfffde[1].xptr.chk: 12 ; 0x4af: 0x0c kfffde[2].xptr.au: 36 ; 0x4b0: 0x00000024 kfffde[2].xptr.disk: 1 ; 0x4b4: 0x0001 kfffde[2].xptr.flags: 0 ; 0x4b6: L=0 E=0 D=0 S=0 kfffde[2].xptr.chk: 15 ; 0x4b7: 0x0f kfffde[3].xptr.au: 4294967295 ; 0x4b8: 0xffffffff kfffde[3].xptr.disk: 65535 ; 0x4bc: 0xffff kfffde[3].xptr.flags: 0 ; 0x4be: L=0 E=0 D=0 S=0
从kfffde[0].xptr.au=38,kfffde[0].xptr.disk=2,kfffde[1].xptr.au=37,kfffde[1].xptr.disk=3,kfffde[2].xptr.au=36,kfffde[2].xptr.disk=1，可知别名目录存储在1,2,3号磁盘（/dev/raw/raw4,/dev/raw/raw3,/dev/raw/raw10)中的36,38,37号AU中，而且这三个AU存储的内容相同，与之前用查询语句所获得的分布情况完全一致。
下面使用kfed工具来读取别名目录的元数据
[grid@jyrac1 ~]$ kfed read /dev/raw/raw4 aun=36 blkn=0 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 11 ; 0x002: KFBTYP_ALIASDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 0 ; 0x004: blk=0 kfbh.block.obj: 6 ; 0x008: file=6 kfbh.check: 2235498606 ; 0x00c: 0x853f006e kfbh.fcn.base: 3565 ; 0x010: 0x00000ded kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0 kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kffdnd.overfl.number: 4294967295 ; 0x00c: 0xffffffff kffdnd.overfl.incarn: 0 ; 0x010: A=0 NUMM=0x0 kffdnd.parent.number: 0 ; 0x014: 0x00000000 kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0 kffdnd.fstblk.number: 0 ; 0x01c: 0x00000000 kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0 kfade[0].entry.incarn: 1 ; 0x024: A=1 NUMM=0x0 kfade[0].entry.hash: 2990280982 ; 0x028: 0xb23c1116 kfade[0].entry.refer.number: 1 ; 0x02c: 0x00000001 --指向下一层的block号 kfade[0].entry.refer.incarn: 1 ; 0x030: A=1 NUMM=0x0 --entry部分内容，表示分支号，hash值和指向下一层block的指针等信息，这部分不需要过多关注 kfade[0].name: JYRAC ; 0x034: length=5 --表示对应的alias元数据名称 kfade[0].fnum: 4294967295 ; 0x064: 0xffffffff --对应文件号，这里为最大值，表示无意义 kfade[0].finc: 4294967295 ; 0x068: 0xffffffff --文件分支号 kfade[0].flags: 8 ; 0x06c: U=0 S=0 S=0 U=1 F=0 --标志信息 --标志信息有以下内容 O - File is original, not snapshot S - File is striped S - Strict allocation policy D - File is damaged C - File creation is committed I - File has empty indirect block R - File has known at-risk value A - The at-risk value itsefl kfade[0].ub1spare: 0 ; 0x06d: 0x00 kfade[0].ub2spare: 0 ; 0x06e: 0x0000 kfade[1].entry.incarn: 1 ; 0x070: A=1 NUMM=0x0 kfade[1].entry.hash: 3585957073 ; 0x074: 0xd5bd5cd1 kfade[1].entry.refer.number: 9 ; 0x078: 0x00000009 kfade[1].entry.refer.incarn: 1 ; 0x07c: A=1 NUMM=0x0 kfade[1].name: DB_UNKNOWN ; 0x080: length=10 kfade[1].fnum: 4294967295 ; 0x0b0: 0xffffffff kfade[1].finc: 4294967295 ; 0x0b4: 0xffffffff kfade[1].flags: 4 ; 0x0b8: U=0 S=0 S=1 U=0 F=0 kfade[1].ub1spare: 0 ; 0x0b9: 0x00 kfade[1].ub2spare: 0 ; 0x0ba: 0x0000 kfade[2].entry.incarn: 3 ; 0x0bc: A=1 NUMM=0x1 kfade[2].entry.hash: 1585230659 ; 0x0c0: 0x5e7cb343 kfade[2].entry.refer.number: 4294967295 ; 0x0c4: 0xffffffff kfade[2].entry.refer.incarn: 0 ; 0x0c8: A=0 NUMM=0x0 kfade[2].name: tts.dmp ; 0x0cc: length=7 kfade[2].fnum: 269 ; 0x0fc: 0x0000010d kfade[2].finc: 930515105 ; 0x100: 0x377688a1 kfade[2].flags: 17 ; 0x104: U=1 S=0 S=0 U=0 F=1 kfade[2].ub1spare: 0 ; 0x105: 0x00 kfade[2].ub2spare: 0 ; 0x106: 0x0000
从kfade[0].entry.refer.number=1，说明我们需要读取1号块来查看其它文件的别名目录
[grid@jyrac1 ~]$ kfed read /dev/raw/raw4 aun=36 blkn=1 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 11 ; 0x002: KFBTYP_ALIASDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 1 ; 0x004: blk=1 kfbh.block.obj: 6 ; 0x008: file=6 kfbh.check: 3120935190 ; 0x00c: 0xba05b116 kfbh.fcn.base: 3558 ; 0x010: 0x00000de6 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0 kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kffdnd.overfl.number: 4294967295 ; 0x00c: 0xffffffff kffdnd.overfl.incarn: 0 ; 0x010: A=0 NUMM=0x0 kffdnd.parent.number: 0 ; 0x014: 0x00000000 kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0 kffdnd.fstblk.number: 1 ; 0x01c: 0x00000001 kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0 kfade[0].entry.incarn: 1 ; 0x024: A=1 NUMM=0x0 kfade[0].entry.hash: 710518681 ; 0x028: 0x2a59a799 kfade[0].entry.refer.number: 2 ; 0x02c: 0x00000002 --指向下一层的block号 kfade[0].entry.refer.incarn: 1 ; 0x030: A=1 NUMM=0x0 kfade[0].name: DATAFILE ; 0x034: length=8 --表示对应的alias元数据名称，datafile指数据文件 kfade[0].fnum: 4294967295 ; 0x064: 0xffffffff kfade[0].finc: 4294967295 ; 0x068: 0xffffffff kfade[0].flags: 8 ; 0x06c: U=0 S=0 S=0 U=1 F=0 kfade[0].ub1spare: 0 ; 0x06d: 0x00 kfade[0].ub2spare: 0 ; 0x06e: 0x0000 kfade[1].entry.incarn: 1 ; 0x070: A=1 NUMM=0x0 kfade[1].entry.hash: 4053320104 ; 0x074: 0xf198c1a8 kfade[1].entry.refer.number: 3 ; 0x078: 0x00000003 --指向下一层的block号 kfade[1].entry.refer.incarn: 1 ; 0x07c: A=1 NUMM=0x0 kfade[1].name: CONTROLFILE ; 0x080: length=11 --表示对应的alias元数据名称，controlfile指控制文件 kfade[1].fnum: 4294967295 ; 0x0b0: 0xffffffff kfade[1].finc: 4294967295 ; 0x0b4: 0xffffffff kfade[1].flags: 8 ; 0x0b8: U=0 S=0 S=0 U=1 F=0 kfade[1].ub1spare: 0 ; 0x0b9: 0x00 kfade[1].ub2spare: 0 ; 0x0ba: 0x0000 kfade[2].entry.incarn: 1 ; 0x0bc: A=1 NUMM=0x0 kfade[2].entry.hash: 873035404 ; 0x0c0: 0x3409768c kfade[2].entry.refer.number: 4 ; 0x0c4: 0x00000004 kfade[2].entry.refer.incarn: 1 ; 0x0c8: A=1 NUMM=0x0 kfade[2].name: temp_files ; 0x0cc: length=10 ---表示对应的alias元数据名称，temp_files指临时文件 kfade[2].fnum: 4294967295 ; 0x0fc: 0xffffffff kfade[2].finc: 4294967295 ; 0x100: 0xffffffff kfade[2].flags: 8 ; 0x104: U=0 S=0 S=0 U=1 F=0 kfade[2].ub1spare: 0 ; 0x105: 0x00 kfade[2].ub2spare: 0 ; 0x106: 0x0000 kfade[3].entry.incarn: 1 ; 0x108: A=1 NUMM=0x0 kfade[3].entry.hash: 2803485489 ; 0x10c: 0xa719cb31 kfade[3].entry.refer.number: 5 ; 0x110: 0x00000005 kfade[3].entry.refer.incarn: 1 ; 0x114: A=1 NUMM=0x0 kfade[3].name: ONLINELOG ; 0x118: length=9 --表示对应的alias元数据名称，onlinelog指联机重做日志 kfade[3].fnum: 4294967295 ; 0x148: 0xffffffff kfade[3].finc: 4294967295 ; 0x14c: 0xffffffff kfade[3].flags: 8 ; 0x150: U=0 S=0 S=0 U=1 F=0 kfade[3].ub1spare: 0 ; 0x151: 0x00 kfade[3].ub2spare: 0 ; 0x152: 0x0000 kfade[4].entry.incarn: 1 ; 0x154: A=1 NUMM=0x0 kfade[4].entry.hash: 2905271101 ; 0x158: 0xad2aeb3d kfade[4].entry.refer.number: 6 ; 0x15c: 0x00000006 kfade[4].entry.refer.incarn: 1 ; 0x160: A=1 NUMM=0x0 kfade[4].name: TEMPFILE ; 0x164: length=8 --表示对应的alias元数据名称，tempfile指临时文件 kfade[4].fnum: 4294967295 ; 0x194: 0xffffffff kfade[4].finc: 4294967295 ; 0x198: 0xffffffff kfade[4].flags: 8 ; 0x19c: U=0 S=0 S=0 U=1 F=0 kfade[4].ub1spare: 0 ; 0x19d: 0x00 kfade[4].ub2spare: 0 ; 0x19e: 0x0000 kfade[5].entry.incarn: 1 ; 0x1a0: A=1 NUMM=0x0 kfade[5].entry.hash: 3261836913 ; 0x1a4: 0xc26bae71 kfade[5].entry.refer.number: 7 ; 0x1a8: 0x00000007 kfade[5].entry.refer.incarn: 1 ; 0x1ac: A=1 NUMM=0x0 kfade[5].name: PARAMETERFILE ; 0x1b0: length=13 --表示对应的alias元数据名称，PARAMETERFILE指参数文件 kfade[5].fnum: 4294967295 ; 0x1e0: 0xffffffff kfade[5].finc: 4294967295 ; 0x1e4: 0xffffffff kfade[5].flags: 8 ; 0x1e8: U=0 S=0 S=0 U=1 F=0 kfade[5].ub1spare: 0 ; 0x1e9: 0x00 kfade[5].ub2spare: 0 ; 0x1ea: 0x0000 kfade[6].entry.incarn: 1 ; 0x1ec: A=1 NUMM=0x0 kfade[6].entry.hash: 1858399388 ; 0x1f0: 0x6ec4ec9c kfade[6].entry.refer.number: 8 ; 0x1f4: 0x00000008 kfade[6].entry.refer.incarn: 1 ; 0x1f8: A=1 NUMM=0x0 kfade[6].name: oradata ; 0x1fc: length=7 kfade[6].fnum: 4294967295 ; 0x22c: 0xffffffff kfade[6].finc: 4294967295 ; 0x230: 0xffffffff kfade[6].flags: 8 ; 0x234: U=0 S=0 S=0 U=1 F=0 kfade[6].ub1spare: 0 ; 0x235: 0x00 kfade[6].ub2spare: 0 ; 0x236: 0x0000 kfade[7].entry.incarn: 1 ; 0x238: A=1 NUMM=0x0 kfade[7].entry.hash: 4097001356 ; 0x23c: 0xf433478c kfade[7].entry.refer.number: 4294967295 ; 0x240: 0xffffffff kfade[7].entry.refer.incarn: 0 ; 0x244: A=0 NUMM=0x0 kfade[7].name: spfilejyrac.ora ; 0x248: length=15 kfade[7].fnum: 256 ; 0x278: 0x00000100 kfade[7].finc: 930411925 ; 0x27c: 0x3774f595 kfade[7].flags: 17 ; 0x280: U=1 S=0 S=0 U=0 F=1 kfade[7].ub1spare: 0 ; 0x281: 0x00 kfade[7].ub2spare: 0 ; 0x282: 0x0000 kfade[8].entry.incarn: 1 ; 0x284: A=1 NUMM=0x0 kfade[8].entry.hash: 2514510081 ; 0x288: 0x95e06101 kfade[8].entry.refer.number: 11 ; 0x28c: 0x0000000b kfade[8].entry.refer.incarn: 3 ; 0x290: A=1 NUMM=0x1 kfade[8].name: DUMPSET ; 0x294: length=7 kfade[8].fnum: 4294967295 ; 0x2c4: 0xffffffff kfade[8].finc: 4294967295 ; 0x2c8: 0xffffffff kfade[8].flags: 4 ; 0x2cc: U=0 S=0 S=1 U=0 F=0 kfade[8].ub1spare: 0 ; 0x2cd: 0x00 kfade[8].ub2spare: 0 ; 0x2ce: 0x0000
如果要查看数据文件别名目录，根据kfade[0].entry.refer.number=2与kfade[0].name=DATAFILE，可知在2号块
[grid@jyrac1 ~]$ kfed read /dev/raw/raw4 aun=36 blkn=2 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 11 ; 0x002: KFBTYP_ALIASDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 2 ; 0x004: blk=2 kfbh.block.obj: 6 ; 0x008: file=6 kfbh.check: 2753078160 ; 0x00c: 0xa418a390 kfbh.fcn.base: 6551 ; 0x010: 0x00001997 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0 kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kffdnd.overfl.number: 4294967295 ; 0x00c: 0xffffffff kffdnd.overfl.incarn: 0 ; 0x010: A=0 NUMM=0x0 kffdnd.parent.number: 1 ; 0x014: 0x00000001 kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0 kffdnd.fstblk.number: 2 ; 0x01c: 0x00000002 kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0 kfade[0].entry.incarn: 1 ; 0x024: A=1 NUMM=0x0 kfade[0].entry.hash: 3486922491 ; 0x028: 0xcfd636fb kfade[0].entry.refer.number: 4294967295 ; 0x02c: 0xffffffff kfade[0].entry.refer.incarn: 0 ; 0x030: A=0 NUMM=0x0 kfade[0].name: SYSAUX ; 0x034: length=6 kfade[0].fnum: 258 ; 0x064: 0x00000102 kfade[0].finc: 930413055 ; 0x068: 0x3774f9ff kfade[0].flags: 18 ; 0x06c: U=0 S=1 S=0 U=0 F=1 kfade[0].ub1spare: 0 ; 0x06d: 0x00 kfade[0].ub2spare: 0 ; 0x06e: 0x0000 kfade[1].entry.incarn: 1 ; 0x070: A=1 NUMM=0x0 kfade[1].entry.hash: 564369944 ; 0x074: 0x21a39a18 kfade[1].entry.refer.number: 4294967295 ; 0x078: 0xffffffff kfade[1].entry.refer.incarn: 0 ; 0x07c: A=0 NUMM=0x0 kfade[1].name: SYSTEM ; 0x080: length=6 kfade[1].fnum: 259 ; 0x0b0: 0x00000103 kfade[1].finc: 930413057 ; 0x0b4: 0x3774fa01 kfade[1].flags: 18 ; 0x0b8: U=0 S=1 S=0 U=0 F=1 kfade[1].ub1spare: 0 ; 0x0b9: 0x00 kfade[1].ub2spare: 0 ; 0x0ba: 0x0000 kfade[2].entry.incarn: 1 ; 0x0bc: A=1 NUMM=0x0 kfade[2].entry.hash: 75817004 ; 0x0c0: 0x0484e02c kfade[2].entry.refer.number: 4294967295 ; 0x0c4: 0xffffffff kfade[2].entry.refer.incarn: 0 ; 0x0c8: A=0 NUMM=0x0 kfade[2].name: EXAMPLE ; 0x0cc: length=7 kfade[2].fnum: 260 ; 0x0fc: 0x00000104 kfade[2].finc: 930413057 ; 0x100: 0x3774fa01 kfade[2].flags: 18 ; 0x104: U=0 S=1 S=0 U=0 F=1 kfade[2].ub1spare: 0 ; 0x105: 0x00 kfade[2].ub2spare: 0 ; 0x106: 0x0000 kfade[3].entry.incarn: 1 ; 0x108: A=1 NUMM=0x0 kfade[3].entry.hash: 3945580605 ; 0x10c: 0xeb2cc83d kfade[3].entry.refer.number: 4294967295 ; 0x110: 0xffffffff kfade[3].entry.refer.incarn: 0 ; 0x114: A=0 NUMM=0x0 kfade[3].name: UNDOTBS2 ; 0x118: length=8 kfade[3].fnum: 261 ; 0x148: 0x00000105 kfade[3].finc: 930413057 ; 0x14c: 0x3774fa01 kfade[3].flags: 18 ; 0x150: U=0 S=1 S=0 U=0 F=1 kfade[3].ub1spare: 0 ; 0x151: 0x00 kfade[3].ub2spare: 0 ; 0x152: 0x0000 kfade[4].entry.incarn: 1 ; 0x154: A=1 NUMM=0x0 kfade[4].entry.hash: 1431819651 ; 0x158: 0x5557d583 kfade[4].entry.refer.number: 4294967295 ; 0x15c: 0xffffffff kfade[4].entry.refer.incarn: 0 ; 0x160: A=0 NUMM=0x0 kfade[4].name: UNDOTBS1 ; 0x164: length=8 kfade[4].fnum: 262 ; 0x194: 0x00000106 kfade[4].finc: 930413057 ; 0x198: 0x3774fa01 kfade[4].flags: 18 ; 0x19c: U=0 S=1 S=0 U=0 F=1 kfade[4].ub1spare: 0 ; 0x19d: 0x00 kfade[4].ub2spare: 0 ; 0x19e: 0x0000 kfade[5].entry.incarn: 1 ; 0x1a0: A=1 NUMM=0x0 kfade[5].entry.hash: 3705183464 ; 0x1a4: 0xdcd89ce8 kfade[5].entry.refer.number: 4294967295 ; 0x1a8: 0xffffffff kfade[5].entry.refer.incarn: 0 ; 0x1ac: A=0 NUMM=0x0 kfade[5].name: USERS ; 0x1b0: length=5 kfade[5].fnum: 263 ; 0x1e0: 0x00000107 kfade[5].finc: 930413057 ; 0x1e4: 0x3774fa01 kfade[5].flags: 18 ; 0x1e8: U=0 S=1 S=0 U=0 F=1 kfade[5].ub1spare: 0 ; 0x1e9: 0x00 kfade[5].ub2spare: 0 ; 0x1ea: 0x0000 kfade[6].entry.incarn: 1 ; 0x1ec: A=1 NUMM=0x0 kfade[6].entry.hash: 1752863906 ; 0x1f0: 0x687a94a2 kfade[6].entry.refer.number: 4294967295 ; 0x1f4: 0xffffffff kfade[6].entry.refer.incarn: 0 ; 0x1f8: A=0 NUMM=0x0 kfade[6].name: FILE_TRANSFER ; 0x1fc: length=13 kfade[6].fnum: 270 ; 0x22c: 0x0000010e kfade[6].finc: 930515465 ; 0x230: 0x37768a09 kfade[6].flags: 18 ; 0x234: U=0 S=1 S=0 U=0 F=1 kfade[6].ub1spare: 0 ; 0x235: 0x00 kfade[6].ub2spare: 0 ; 0x236: 0x0000 kfade[7].entry.incarn: 1 ; 0x238: A=1 NUMM=0x0 kfade[7].entry.hash: 2844469351 ; 0x23c: 0xa98b2867 kfade[7].entry.refer.number: 4294967295 ; 0x240: 0xffffffff kfade[7].entry.refer.incarn: 0 ; 0x244: A=0 NUMM=0x0 kfade[7].name: test01.dbf ; 0x248: length=10 kfade[7].fnum: 270 ; 0x278: 0x0000010e kfade[7].finc: 930515465 ; 0x27c: 0x37768a09 kfade[7].flags: 17 ; 0x280: U=1 S=0 S=0 U=0 F=1 kfade[7].ub1spare: 0 ; 0x281: 0x00 kfade[7].ub2spare: 0 ; 0x282: 0x0000 kfade[8].entry.incarn: 5 ; 0x284: A=1 NUMM=0x2 kfade[8].entry.hash: 2512381731 ; 0x288: 0x95bfe723 kfade[8].entry.refer.number: 4294967295 ; 0x28c: 0xffffffff kfade[8].entry.refer.incarn: 0 ; 0x290: A=0 NUMM=0x0 kfade[8].name: CS ; 0x294: length=2 kfade[8].fnum: 271 ; 0x2c4: 0x0000010f kfade[8].finc: 931880499 ; 0x2c8: 0x378b5e33 kfade[8].flags: 18 ; 0x2cc: U=0 S=1 S=0 U=0 F=1 kfade[8].ub1spare: 0 ; 0x2cd: 0x00 kfade[8].ub2spare: 0 ; 0x2ce: 0x0000 kfade[9].entry.incarn: 3 ; 0x2d0: A=1 NUMM=0x1 kfade[9].entry.hash: 4011892030 ; 0x2d4: 0xef209d3e kfade[9].entry.refer.number: 4294967295 ; 0x2d8: 0xffffffff kfade[9].entry.refer.incarn: 0 ; 0x2dc: A=0 NUMM=0x0 kfade[9].name: CS_STRIPE_COARSE ; 0x2e0: length=16 kfade[9].fnum: 272 ; 0x310: 0x00000110 kfade[9].finc: 931882089 ; 0x314: 0x378b6469 kfade[9].flags: 18 ; 0x318: U=0 S=1 S=0 U=0 F=1 kfade[9].ub1spare: 0 ; 0x319: 0x00 kfade[9].ub2spare: 0 ; 0x31a: 0x0000 kfade[10].entry.incarn: 1 ; 0x31c: A=1 NUMM=0x0 kfade[10].entry.hash: 1365029949 ; 0x320: 0x515cb43d kfade[10].entry.refer.number:4294967295 ; 0x324: 0xffffffff kfade[10].entry.refer.incarn: 0 ; 0x328: A=0 NUMM=0x0 kfade[10].name: NOT_IMPORTANT ; 0x32c: length=13 kfade[10].fnum: 273 ; 0x35c: 0x00000111 kfade[10].finc: 931882831 ; 0x360: 0x378b674f kfade[10].flags: 18 ; 0x364: U=0 S=1 S=0 U=0 F=1 kfade[10].ub1spare: 0 ; 0x365: 0x00 kfade[10].ub2spare: 0 ; 0x366: 0x0000
从上面信息，我们可以知道sysaux对应是file 258,system对应file 259,EXAMPLE对应file 260,UNDOTBS2 对应file 261等等，与视图中查询的结果完全一致。
同理，controlfile控制文件在3号块。
[grid@jyrac1 ~]$ kfed read /dev/raw/raw4 aun=36 blkn=3 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 11 ; 0x002: KFBTYP_ALIASDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 3 ; 0x004: blk=3 kfbh.block.obj: 6 ; 0x008: file=6 kfbh.check: 3091636595 ; 0x00c: 0xb846a173 kfbh.fcn.base: 734 ; 0x010: 0x000002de kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0 kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kffdnd.overfl.number: 4294967295 ; 0x00c: 0xffffffff kffdnd.overfl.incarn: 0 ; 0x010: A=0 NUMM=0x0 kffdnd.parent.number: 1 ; 0x014: 0x00000001 kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0 kffdnd.fstblk.number: 3 ; 0x01c: 0x00000003 kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0 kfade[0].entry.incarn: 3 ; 0x024: A=1 NUMM=0x1 kfade[0].entry.hash: 62930150 ; 0x028: 0x03c03ce6 kfade[0].entry.refer.number: 4294967295 ; 0x02c: 0xffffffff kfade[0].entry.refer.incarn: 0 ; 0x030: A=0 NUMM=0x0 kfade[0].name: current ; 0x034: length=7 kfade[0].fnum: 257 ; 0x064: 0x00000101 kfade[0].finc: 930412709 ; 0x068: 0x3774f8a5 kfade[0].flags: 18 ; 0x06c: U=0 S=1 S=0 U=0 F=1 kfade[0].ub1spare: 0 ; 0x06d: 0x00 kfade[0].ub2spare: 0 ; 0x06e: 0x0000 kfade[1].entry.incarn: 0 ; 0x070: A=0 NUMM=0x0 kfade[1].entry.hash: 0 ; 0x074: 0x00000000 kfade[1].entry.refer.number: 0 ; 0x078: 0x00000000 kfade[1].entry.refer.incarn: 0 ; 0x07c: A=0 NUMM=0x0 kfade[1].name: ; 0x080: length=0 kfade[1].fnum: 0 ; 0x0b0: 0x00000000 kfade[1].finc: 0 ; 0x0b4: 0x00000000 kfade[1].flags: 0 ; 0x0b8: U=0 S=0 S=0 U=0 F=0 kfade[1].ub1spare: 0 ; 0x0b9: 0x00 kfade[1].ub2spare: 0 ; 0x0ba: 0x0000 kfade[2].entry.incarn: 0 ; 0x0bc: A=0 NUMM=0x0 kfade[2].entry.hash: 0 ; 0x0c0: 0x00000000 kfade[2].entry.refer.number: 0 ; 0x0c4: 0x00000000 kfade[2].entry.refer.incarn: 0 ; 0x0c8: A=0 NUMM=0x0
从上面信息，你可以知道目前数据库的controlfile名称为：current.257.930412709
同理,onlinelog联机重做日志在5号块
[grid@jyrac1 ~]$ kfed read /dev/raw/raw4 aun=36 blkn=5 | more kfbh.endian: 1 ; 0x000: 0x01 kfbh.hard: 130 ; 0x001: 0x82 kfbh.type: 11 ; 0x002: KFBTYP_ALIASDIR kfbh.datfmt: 1 ; 0x003: 0x01 kfbh.block.blk: 5 ; 0x004: blk=5 kfbh.block.obj: 6 ; 0x008: file=6 kfbh.check: 1209488605 ; 0x00c: 0x481754dd kfbh.fcn.base: 3491 ; 0x010: 0x00000da3 kfbh.fcn.wrap: 0 ; 0x014: 0x00000000 kfbh.spare1: 0 ; 0x018: 0x00000000 kfbh.spare2: 0 ; 0x01c: 0x00000000 kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0 kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0 kffdnd.overfl.number: 4294967295 ; 0x00c: 0xffffffff kffdnd.overfl.incarn: 0 ; 0x010: A=0 NUMM=0x0 kffdnd.parent.number: 1 ; 0x014: 0x00000001 kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0 kffdnd.fstblk.number: 5 ; 0x01c: 0x00000005 kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0 kfade[0].entry.incarn: 1 ; 0x024: A=1 NUMM=0x0 kfade[0].entry.hash: 2375841806 ; 0x028: 0x8d9c780e kfade[0].entry.refer.number: 4294967295 ; 0x02c: 0xffffffff kfade[0].entry.refer.incarn: 0 ; 0x030: A=0 NUMM=0x0 kfade[0].name: group_1 ; 0x034: length=7 kfade[0].fnum: 264 ; 0x064: 0x00000108 kfade[0].finc: 930413221 ; 0x068: 0x3774faa5 kfade[0].flags: 18 ; 0x06c: U=0 S=1 S=0 U=0 F=1 kfade[0].ub1spare: 0 ; 0x06d: 0x00 kfade[0].ub2spare: 0 ; 0x06e: 0x0000 kfade[1].entry.incarn: 1 ; 0x070: A=1 NUMM=0x0 kfade[1].entry.hash: 1478106543 ; 0x074: 0x581a1daf kfade[1].entry.refer.number: 4294967295 ; 0x078: 0xffffffff kfade[1].entry.refer.incarn: 0 ; 0x07c: A=0 NUMM=0x0 kfade[1].name: group_2 ; 0x080: length=7 kfade[1].fnum: 265 ; 0x0b0: 0x00000109 kfade[1].finc: 930413225 ; 0x0b4: 0x3774faa9 kfade[1].flags: 18 ; 0x0b8: U=0 S=1 S=0 U=0 F=1 kfade[1].ub1spare: 0 ; 0x0b9: 0x00 kfade[1].ub2spare: 0 ; 0x0ba: 0x0000 kfade[2].entry.incarn: 1 ; 0x0bc: A=1 NUMM=0x0 kfade[2].entry.hash: 429163817 ; 0x0c0: 0x19948529 kfade[2].entry.refer.number: 4294967295 ; 0x0c4: 0xffffffff kfade[2].entry.refer.incarn: 0 ; 0x0c8: A=0 NUMM=0x0 kfade[2].name: group_3 ; 0x0cc: length=7 kfade[2].fnum: 266 ; 0x0fc: 0x0000010a kfade[2].finc: 930413227 ; 0x100: 0x3774faab kfade[2].flags: 18 ; 0x104: U=0 S=1 S=0 U=0 F=1 kfade[2].ub1spare: 0 ; 0x105: 0x00 kfade[2].ub2spare: 0 ; 0x106: 0x0000 kfade[3].entry.incarn: 1 ; 0x108: A=1 NUMM=0x0 kfade[3].entry.hash: 2232040441 ; 0x10c: 0x850a3bf9 kfade[3].entry.refer.number: 4294967295 ; 0x110: 0xffffffff kfade[3].entry.refer.incarn: 0 ; 0x114: A=0 NUMM=0x0 kfade[3].name: group_4 ; 0x118: length=7 kfade[3].fnum: 267 ; 0x148: 0x0000010b kfade[3].finc: 930413231 ; 0x14c: 0x3774faaf kfade[3].flags: 18 ; 0x150: U=0 S=1 S=0 U=0 F=1 kfade[3].ub1spare: 0 ; 0x151: 0x00 kfade[3].ub2spare: 0 ; 0x152: 0x0000
从上面信息，你可以知道目前数据库的联机重做日志文件名称为：group_1.264.930413221,group_2.265.930413225,group_3.266.930413227,group_4.267.930413231
同理，找到spfile的alias信息为:SPFILE.256.930411925,当知道数据库文件的alias名称之后，如果利用amdu从asm diskgroup中抽取某个文件，那么就很容易了，而且如果你后面需要用来恢复，甚至你连文件名都不用改，如下例子抽取上述的spfile：
[grid@jyrac1 ~]$ amdu -dis '/dev/raw/raw*' -extract datadg.256 -output spfile.256.930411925 amdu_2016_12_29_21_15_43/ AMDU-00204: Disk N0003 is in currently mounted diskgroup DATADG AMDU-00201: Disk N0003: '/dev/raw/raw11' AMDU-00204: Disk N0009 is in currently mounted diskgroup DATADG AMDU-00201: Disk N0009: '/dev/raw/raw4' AMDU-00204: Disk N0008 is in currently mounted diskgroup DATADG AMDU-00201: Disk N0008: '/dev/raw/raw3' [grid@jyrac1 ~]$ cat spfile.256.930411925 jyrac1.__db_cache_size=1795162112 jyrac2.__db_cache_size=1795162112 jyrac2.__java_pool_size=16777216 jyrac1.__java_pool_size=16777216 jyrac2.__large_pool_size=33554432 jyrac1.__large_pool_size=33554432 jyrac1.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment jyrac2.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment jyrac2.__pga_aggregate_target=838860800 jyrac1.__pga_aggregate_target=838860800 jyrac2.__sga_target=2516582400 jyrac1.__sga_target=2516582400 jyrac2.__shared_io_pool_size=0 jyrac1.__shared_io_pool_size=0 jyrac1.__shared_pool_size=587202560 jyrac2.__shared_pool_size=637534208 jyrac2.__streams_pool_size=0 jyrac1.__streams_pool_size=0 *.audit_file_dest='/u01/app/oracle/admin/jyrac/adump' *.audit_trail='db' *.cluster_database=true *.compatible='11.2.0.4.0' *.control_files='+DATADG/jyrac/controlfile/current.257.930412709' *.db_block_size=8192 *.db_create_file_dest='+DATADG' *.db_domain='' *.db_name='jyrac' *.diagnostic_dest='/u01/app/oracle' *.dispatchers='(PROTOCOL=TCP) (SERVICE=jyracXDB)' jyrac1.dispatchers='(PROTOCOL=TCP) (SERVICE=jyrac1XDB)' jyrac2.dispatchers='(PROTOCOL=TCP) (SERVICE=jyrac2XDB)' jyrac2.instance_number=2 jyrac1.instance_number=1 *.job_queue_processes=1000 JYRAC1.listener_networks='((NAME=network1)(LOCAL_LISTENER=10.138.130.152:1521)(REMOTE_LISTENER=10.138.130.155:1521))','((NAME=network2)(LOCAL_LISTENER=10.138.130.152:1521)(REMOTE_LISTENER=10.138.130.156:1521))','((NAME=network3)(LOCAL_LISTENER=10.138.130.152:1521)(REMOTE_LISTENER=10.138.130.157:1521))' JYRAC2.listener_networks='((NAME=network1)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.155:1521))','((NAME=network2)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.156:1521))','((NAME=network3)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.157:1521))' jyrac2.listener_networks='((NAME=network1)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.155:1521))','((NAME=network2)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.156:1521))','((NAME=network3)(LOCAL_LISTENER=10.138.130.154:1521)(REMOTE_LISTENER=10.138.130.157:1521))' jyrac1.listener_networks='((NAME=network1)(LOCAL_LISTENER=10.138.130.153:1521)(REMOTE_LISTENER=10.138.130.155:1521))','((NAME=network2)(LOCAL_LISTENER=10.138.130.153:1521)(REMOTE_LISTENER=10.138.130.156:1521))','((NAME=network3)(LOCAL_LISTENER=10.138.130.153:1521)(REMOTE_LISTENER=10.138.130.157:1521))' *.log_archive_dest_1='location=+archdg/jyrac/' *.open_cursors=300 *.pga_aggregate_target=836763648 *.processes=150 *.remote_listener='jyrac-scan:1521' *.remote_login_passwordfile='exclusive' *.sga_target=2510290944 jyrac2.thread=2 jyrac1.thread=1 jyrac1.undo_tablespace='UNDOTBS1' jyrac2.undo_tablespace='UNDOTBS2'
小结:
别名目录用来跟踪ASM磁盘组中的所有别名，可以通过查询v$asm_alias来查看现有文件的别名。