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        聊聊RMAN的ARCHIVELOGDELETION參數(shù)

        來(lái)源:懂視網(wǎng) 責(zé)編:小采 時(shí)間:2020-11-09 16:20:16
        文檔

        聊聊RMAN的ARCHIVELOGDELETION參數(shù)

        聊聊RMAN的ARCHIVELOGDELETION參數(shù):RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)可 RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)
        推薦度:
        導(dǎo)讀聊聊RMAN的ARCHIVELOGDELETION參數(shù):RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)可 RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)

        RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)可

        RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)可是Oracle備份還原官方策略。

        Archivelog是Oracle備份還原策略的重要組成元素,不完全備份+連續(xù)的歸檔日志可以讓我們將數(shù)據(jù)庫(kù)恢復(fù)到發(fā)生故障點(diǎn),實(shí)現(xiàn)數(shù)據(jù)的無(wú)損失恢復(fù)。但是,現(xiàn)實(shí)生活中archive log給沒(méi)有經(jīng)驗(yàn)的運(yùn)維人員也帶來(lái)了不少的問(wèn)題,歸檔空間占滿引起Hang住、瞬間歸檔日志過(guò)多生成引起問(wèn)題等。一些前輩也在不斷強(qiáng)調(diào)“歸檔模式不美好”。

        在RMAN工作參數(shù)中,針對(duì)archive log,是可以設(shè)置專門(mén)的刪除策略(Deletion)。在實(shí)踐領(lǐng)域中,已經(jīng)備份過(guò)或者確保安全傳輸?shù)臍w檔日志,其實(shí)就可以刪除了,特別是在有限的Fast Recovery Area管理模式下。對(duì)于自動(dòng)刪除archive log的策略,比較常見(jiàn)的是applied to standby和shipped to standby,也就是Data Guard場(chǎng)景下。

        本篇介紹簡(jiǎn)單的backed up參數(shù)使用情況,并通過(guò)一系列實(shí)驗(yàn)去研究該參數(shù)影響下Oracle和RMAN的工作行為特性。

        1、基本參數(shù)和實(shí)驗(yàn)環(huán)境

        筆者使用Oracle 11gR2進(jìn)行測(cè)試,具體版本編號(hào)為11.2.0.4。

        SQL> select * from v$version;

        BANNER

        --------------------------------------------------------------------------------

        Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

        PL/SQL Release 11.2.0.3.0 - Production

        CORE 11.2.0.3.0 Production

        TNS for Linux: Version 11.2.0.3.0 - Production

        NLSRTL Version 11.2.0.3.0 – Production

        默認(rèn)情況下,archivelog deletion policy參數(shù)為NONE。

        RMAN> show all;

        RMAN configuration parameters for database with db_unique_name XXXXDB are:

        CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default

        (篇幅原因,有省略……)

        CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default

        該參數(shù)常見(jiàn)的集中取值如下:

        configure archivelog deletion policy to backed up 2 times to sbt;

        configure archivelog deletion policy to backed up 1 times to device type disk;

        configure archivelog deletion policy to applied on standby; --DG專用

        configure archivelog deletion policy to shipped on standby; --DG專用

        configure archivelog deletion policy clear;

        研究archivelog行為最好的工具視圖是v$archived_log。很多DBA喜歡從操作系統(tǒng)層面刪除歸檔日志,但是這種方式是不會(huì)直接被Oracle控制文件認(rèn)可,所以建議使用RMAN或者官方工具來(lái)做。

        --已歸檔未刪除日志

        SQL> select count(*) from v$archived_log where archived='YES' and deleted='NO';

        COUNT(*)

        ----------

        13

        2、第一輪備份測(cè)試實(shí)驗(yàn)

        首先我們修改archivelog deletion policy參數(shù),設(shè)置為“兩次備份后即可以刪除”。

        RMAN> configure archivelog deletion policy to backed up 2 times to device type disk;

        new RMAN configuration parameters:

        CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 2 TIMES TO DISK;

        new RMAN configuration parameters are successfully stored

        手工備份數(shù)據(jù)庫(kù)和歸檔日志,不進(jìn)行刪除動(dòng)作。

        RMAN> backup database plus archivelog;

        Starting backup at 21-SEP-15

        current log archived

        allocated channel: ORA_DISK_1

        channel ORA_DISK_1: SID=16 device type=DISK

        channel ORA_DISK_1: starting archived log backup set

        channel ORA_DISK_1: specifying archived log(s) in backup set

        input archived log thread=1 sequence=100 RECID=12 STAMP=890690423

        input archived log thread=1 sequence=101 RECID=13 STAMP=890712061

        input archived log thread=1 sequence=102 RECID=14 STAMP=890727732

        input archived log thread=1 sequence=103 RECID=15 STAMP=890776815

        input archived log thread=1 sequence=104 RECID=16 STAMP=890776833

        input archived log thread=1 sequence=105 RECID=17 STAMP=890805616

        input archived log thread=1 sequence=106 RECID=18 STAMP=890814181

        input archived log thread=1 sequence=107 RECID=19 STAMP=890820201

        input archived log thread=1 sequence=108 RECID=20 STAMP=890859629

        input archived log thread=1 sequence=109 RECID=21 STAMP=890892046

        input archived log thread=1 sequence=110 RECID=22 STAMP=890900632

        input archived log thread=1 sequence=111 RECID=23 STAMP=890906655

        input archived log thread=1 sequence=112 RECID=24 STAMP=890942416

        input archived log thread=1 sequence=113 RECID=25 STAMP=890990204

        channel ORA_DISK_1: starting piece 1 at 21-SEP-15

        channel ORA_DISK_1: finished piece 1 at 21-SEP-15

        piece handle=/u01/app/oracle/fast_recovery_area/XXXXDB/backupset/2015_09_21/o1_mf_annnn_TAG20150921T091644_bzypmwty_.bkp tag=TAG20150921T091644

        (篇幅原因,省略部分……)

        Finished Control File and SPFILE Autobackup at 21-SEP-15

        此時(shí),歸檔日志被備份,并且沒(méi)有刪除。

        --多出來(lái)的兩個(gè)是由于進(jìn)行備份時(shí)候自動(dòng)會(huì)有switch log

        SQL> select count(*) from v$archived_log where archived='YES' and deleted='NO';

        COUNT(*)

        ----------

        15

        下面進(jìn)行第二次實(shí)驗(yàn)。

        RMAN> backup database plus archivelog;

        Starting backup at 21-SEP-15

        current log archived

        using channel ORA_DISK_1

        channel ORA_DISK_1: starting archived log backup set

        channel ORA_DISK_1: specifying archived log(s) in backup set

        input archived log thread=1 sequence=100 RECID=12 STAMP=890690423

        input archived log thread=1 sequence=101 RECID=13 STAMP=890712061

        input archived log thread=1 sequence=102 RECID=14 STAMP=890727732

        input archived log thread=1 sequence=103 RECID=15 STAMP=890776815

        input archived log thread=1 sequence=104 RECID=16 STAMP=890776833

        input archived log thread=1 sequence=105 RECID=17 STAMP=890805616

        input archived log thread=1 sequence=106 RECID=18 STAMP=890814181

        input archived log thread=1 sequence=107 RECID=19 STAMP=890820201

        input archived log thread=1 sequence=108 RECID=20 STAMP=890859629

        input archived log thread=1 sequence=109 RECID=21 STAMP=890892046

        input archived log thread=1 sequence=110 RECID=22 STAMP=890900632

        input archived log thread=1 sequence=111 RECID=23 STAMP=890906655

        input archived log thread=1 sequence=112 RECID=24 STAMP=890942416

        input archived log thread=1 sequence=113 RECID=25 STAMP=890990204

        input archived log thread=1 sequence=114 RECID=26 STAMP=890990263

        input archived log thread=1 sequence=115 RECID=27 STAMP=890990391

        channel ORA_DISK_1: starting piece 1 at 21-SEP-15

        channel ORA_DISK_1: finished piece 1 at 21-SEP-15

        piece handle=/u01/app/oracle/fast_recovery_area/XXXXDB/backupset/2015_09_21/o1_mf_annnn_TAG20150921T091951_bzypsqj3_.bkp tag=TAG20150921T091951

        (篇幅原因,有省略……)

        Finished Control File and SPFILE Autobackup at 21-SEP-15

        第二次備份,之前備份過(guò)的日志還出現(xiàn)在自動(dòng)備份的列表中。但是,在第二次備份的時(shí)候,已經(jīng)備份過(guò)兩次(deletion policy)的日志并沒(méi)有自動(dòng)刪除。

        SQL> select count(*) from v$archived_log where archived='YES' and deleted='NO';

        COUNT(*)

        ----------

        17

        歸檔日志還在fast recovery area中。

        [oracle@Databaseintrawebpro fast_recovery_area]$ du -h

        19M ./XXXXDB/autobackup/2015_09_21

        9.4M ./XXXXDB/autobackup/2015_09_17

        29M ./XXXXDB/autobackup

        151M ./XXXXDB/onlinelog

        6.0G ./XXXXDB/backupset/2015_09_21

        108K ./XXXXDB/backupset/2015_09_17

        6.0G ./XXXXDB/backupset

        125M ./XXXXDB/archivelog/2015_09_19

        27M ./XXXXDB/archivelog/2015_09_21

        4.0K ./XXXXDB/archivelog/2015_09_15

        127M ./XXXXDB/archivelog/2015_09_18

        121M ./XXXXDB/archivelog/2015_09_20

        4.0K ./XXXXDB/archivelog/2015_09_16

        32M ./XXXXDB/archivelog/2015_09_17

        431M ./XXXXDB/archivelog

        9.4M ./XXXXDB/controlfile

        6.6G ./XXXXDB

        6.6G .

        此時(shí),歸檔日志和備份次數(shù),在v$archived_log中可以方便的找出來(lái)。

        SQL> alter system switch logfile;

        System altered

        SQL> select count(*) from v$archived_log where archived='YES' and deleted='NO';

        COUNT(*)

        ----------

        18

        --注意這些已經(jīng)備份過(guò)兩次的recid編號(hào)

        SQL> select recid, sequence#, archived, deleted, backup_count from v$archived_log where backup_count>1;

        RECID SEQUENCE# ARCHIVED DELETED BACKUP_COUNT

        ---------- ---------- -------- ------- ------------

        12 100 YES NO 2

        13 101 YES NO 2

        14 102 YES NO 2

        15 103 YES NO 2

        16 104 YES NO 2

        17 105 YES NO 2

        18 106 YES NO 2

        19 107 YES NO 2

        20 108 YES NO 2

        21 109 YES NO 2

        22 110 YES NO 2

        23 111 YES NO 2

        24 112 YES NO 2

        25 113 YES NO 2

        26 114 YES NO 2

        15 rows selected

        進(jìn)行第三次備份。

        RMAN> backup database plus archivelog;

        Starting backup at 21-SEP-15

        current log archived

        allocated channel: ORA_DISK_1

        channel ORA_DISK_1: SID=498 device type=DISK

        skipping archived logs of thread 1 from sequence 100 to 114; already backed up

        channel ORA_DISK_1: starting archived log backup set

        channel ORA_DISK_1: specifying archived log(s) in backup set

        input archived log thread=1 sequence=115 RECID=27 STAMP=890990391

        input archived log thread=1 sequence=116 RECID=28 STAMP=890990481

        input archived log thread=1 sequence=117 RECID=29 STAMP=890990667

        input archived log thread=1 sequence=118 RECID=30 STAMP=890993128

        channel ORA_DISK_1: starting piece 1 at 21-SEP-15

        channel ORA_DISK_1: finished piece 1 at 21-SEP-15

        piece

        (篇幅原因,有省略…….)

        Finished Control File and SPFILE Autobackup at 21-SEP-15

        注意:備份過(guò)兩次的日志,沒(méi)有出現(xiàn)在RMAN自動(dòng)備份的列表中。這里我們定義到了刪除策略的一個(gè)行為:當(dāng)滿足刪除條件的時(shí)候,歸檔日志是不會(huì)進(jìn)入備份集合列表的。

        歸檔日志信息:

        SQL> select recid, sequence#, archived, deleted, backup_count from v$archived_log where backup_count>1;

        RECID SEQUENCE# ARCHIVED DELETED BACKUP_COUNT

        ---------- ---------- -------- ------- ------------

        12 100 YES YES 2

        13 101 YES YES 2

        14 102 YES YES 2

        15 103 YES YES 2

        16 104 YES YES 2

        17 105 YES YES 2

        18 106 YES YES 2

        19 107 YES YES 2

        20 108 YES YES 2

        21 109 YES YES 2

        22 110 YES YES 2

        23 111 YES YES 2

        24 112 YES YES 2

        25 113 YES YES 2

        26 114 YES NO 2

        27 115 YES NO 2

        28 116 YES NO 2

        17 rows selected

        注意:一部分歸檔日志被刪除,但是并沒(méi)有所有上次備份過(guò)兩次的日志都刪除掉了,比如recid=26的日志。此時(shí),備份fast recovery area空間情況發(fā)生了變化。

        [oracle@Databaseintrawebpro fast_recovery_area]$ du -h

        29M ./XXXXDB/autobackup/2015_09_21

        4.0K ./XXXXDB/autobackup/2015_09_17

        29M ./XXXXDB/autobackup

        151M ./XXXXDB/onlinelog

        5.5G ./XXXXDB/backupset/2015_09_21

        4.0K ./XXXXDB/backupset/2015_09_17

        5.5G ./XXXXDB/backupset

        4.0K ./XXXXDB/archivelog/2015_09_19

        2.5M ./XXXXDB/archivelog/2015_09_21

        4.0K ./XXXXDB/archivelog/2015_09_15

        4.0K ./XXXXDB/archivelog/2015_09_18

        4.0K ./XXXXDB/archivelog/2015_09_20

        4.0K ./XXXXDB/archivelog/2015_09_16

        4.0K ./XXXXDB/archivelog/2015_09_17

        2.6M ./XXXXDB/archivelog

        9.4M ./XXXXDB/controlfile

        5.7G ./XXXXDB

        5.7G .

        在alert log中,我們看到了Oracle自動(dòng)刪除的動(dòng)作。

        Mon Sep 21 09:24:27 2015

        Expanded controlfile section 11 from 28 to 56 records

        Requested to grow by 28 records; added 1 blocks of records

        Archived Log entry 29 added for thread 1 sequence 117 ID 0x774e158c dest 1:

        Mon Sep 21 10:05:28 2015

        ALTER SYSTEM ARCHIVE LOG

        Mon Sep 21 10:05:28 2015

        Thread 1 advanced to log sequence 119 (LGWR switch)

        Current log# 2 seq# 119 mem# 0: /u01/app/oracle/oradata/XXXXDB/onlinelog/o1_mf_2_bxzzjj5w_.log

        Current log# 2 seq# 119 mem# 1: /u01/app/oracle/fast_recovery_area/XXXXDB/onlinelog/o1_mf_2_bxzzjj80_.log

        Archived Log entry 30 added for thread 1 sequence 118 ID 0x774e158c dest 1:

        Mon Sep 21 10:05:47 2015

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/backupset/2015_09_17/o1_mf_annnn_TAG20150917T195557_bzoblfck_.bkp

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_17/o1_mf_1_100_bzokvqj0_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/autobackup/2015_09_17/o1_mf_s_890682958_bzoblglw_.bkp

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_18/o1_mf_1_101_bzp6zx31_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_18/o1_mf_1_102_bzpp9nln_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_18/o1_mf_1_103_bzr67h1h_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_18/o1_mf_1_104_bzr6812s_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_19/o1_mf_1_105_bzs2cj5y_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_19/o1_mf_1_106_bzsbq54p_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_19/o1_mf_1_107_bzsjm99v_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_19/o1_mf_1_108_bztq3f2v_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_20/o1_mf_1_109_bzvprgf1_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_20/o1_mf_1_110_bzvz4rj7_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_20/o1_mf_1_111_bzw50zmb_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_20/o1_mf_1_112_bzx7yj9g_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/archivelog/2015_09_21/o1_mf_1_113_bzypmw8c_.arc

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/backupset/2015_09_21/o1_mf_annnn_TAG20150921T091644_bzypmwty_.bkp

        Mon Sep 21 10:05:58 2015

        Deleted Oracle managed file /u01/app/oracle/fast_recovery_area/XXXXDB/backupset/2015_09_21/o1_mf_nnndf_TAG20150921T091647_bzypn055_.bkp

        Mon Sep 21 10:06:15 2015

        ALTER SYSTEM ARCHIVE LOG

        Mon Sep 21 10:06:15 2015

        Thread 1 advanced to log sequence 120 (LGWR switch)

        Current log# 3 seq# 120 mem# 0: /u01/app/oracle/oradata/XXXXDB/onlinelog/o1_mf_3_bxzzjl0z_.log

        Current log# 3 seq# 120 mem# 1: /u01/app/oracle/fast_recovery_area/XXXXDB/onlinelog/o1_mf_3_bxzzjl35_.log

        Archived Log entry 31 added for thread 1 sequence 119 ID 0x774e158c dest 1:

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        聊聊RMAN的ARCHIVELOGDELETION參數(shù)

        聊聊RMAN的ARCHIVELOGDELETION參數(shù):RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)可 RMAN是Oracle推出的官方備份還原工具。經(jīng)過(guò)幾個(gè)大版本的發(fā)展,RMAN已經(jīng)支持多種備份介質(zhì)和恢復(fù)策略的主要工具,也是業(yè)界普遍認(rèn)
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