BBED恢復非歸檔offline drop的資料檔案
阿新 • • 發佈：2020-11-26
環境模擬
SQL> alter database datafile '/oradata/prod/testtbs01.dbf' offline drop; Database altered. SQL> alter system checkpoint; System altered. SQL> select file#,to_char(change#) from v$recover_file; FILE# TO_CHAR(CHANGE#) ---------- ---------------------------------------- 5 42951050917SQL> select file#,to_char(checkpoint_change#) from v$datafile; FILE# TO_CHAR(CHECKPOINT_CHANGE#) ---------- ---------------------------------------- 1 42951051037 2 42951051037 3 42951051037 4 42951051037 5 42951050917 SQL> alter system switch logfile; System altered. 執行多次，讓日誌檔案覆蓋 SQL> alter database datafile '/oradata/prod/testtbs01.dbf' online; alter database datafile '/oradata/prod/testtbs01.dbf' online * ERROR at line 1: ORA-01113: file 5 needs media recovery ORA-01110: data file 5: '/oradata/prod/testtbs01.dbf' SQL> recover datafile 5; ORA-00279: change 42951050917 generated at 11/23/2020 22:45:27 needed for thread 1 ORA-00289: suggestion : /arch/1_67_1052188220.dbf ORA-00280: change 42951050917 for thread 1 is in sequence #67 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} ORA-00308: cannot open archived log '/arch/1_67_1052188220.dbf' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3
BBED修改檔案SCN號恢復
BBED> set file 5 block 1 FILE# 5 BLOCK# 1 BBED> p kcvfhckp struct kcvfhckp, 36 bytes @484 struct kcvcpscn, 8 bytes @484 ub4 kscnbas @484 0x001506a5 ub2 kscnwrp @488 0x000a ub4 kcvcptim @492 0x3f04b207 ub2 kcvcpthr @496 0x0001 union u, 12 bytes @500 struct kcvcprba, 12 bytes @500 ub4 kcrbaseq @500 0x00000043 ub4 kcrbabno @504 0x000085f4 ub2 kcrbabof @508 0x0010 ub4 kscnbas @484 需要修改為當前資料檔案的CHECKPOINT_CHANGE# SQL> select to_char(42951051037-to_char(to_number('a','xxxxx')*4294967296),'xxxxxxxx') from dual; TO_CHAR(42951051037-TO_CHAR(TO_NUMBER('A','XXXXX')*4294967296),'XXXXXXXX') ----------------------------------- 15071d ub4 kcvcptim @492 0x3f04b207需要修改為當前資料檔案的creation_name_scn SQL> select file#, 2 to_char(CHECKPOINT_TIME, 'yyyy-mm-dd hh24:mi:ss') CHECKPOINT_TIME_file, 3 (to_char(CHECKPOINT_TIME, 'yyyy') - 1988) * 12 * 31 * 24 * 3600 + 4 (to_char(CHECKPOINT_TIME, 'mm') - 1) * 31 * 24 * 3600 + 5 (to_char(CHECKPOINT_TIME, 'dd') - 1) * 24 * 3600 + 6 to_char(CHECKPOINT_TIME, 'hh24') * 3600 + 7 to_char(CHECKPOINT_TIME, 'mi') * 60 + to_char(CHECKPOINT_TIME, 'ss') creation_name_scn 8 from v$datafile 9 order by 1; FILE# CHECKPOINT_TIME_FILE CREATION_NAME_SCN ---------- --------------------------------------------------------------------------- ----------------- 1 2020-11-23 22:46:27 1057272387 2 2020-11-23 22:46:27 1057272387 3 2020-11-23 22:46:27 1057272387 4 2020-11-23 22:46:27 1057272387 5 2020-11-23 22:45:27 1057272327 SQL> select to_char(1057272387,'xxxxxxxxxx') from dual; TO_CHAR(1057272387,'XXXXXXXXXX') ------------------------------------------------ 3f04b243 BBED> modify /x 1d0715 offset 484 Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) Y File: /oradata/prod/testtbs01.dbf (5) Block: 1 Offsets: 484 to 995 Dba:0x01400001 ------------------------------------------------------------------------ 1d071500 0a000000 07b2043f 01000000 43000000 f4850000 10000000 02000000 BBED> modify /x 43b2043f offset 492 File: /oradata/prod/testtbs01.dbf (5) Block: 1 Offsets: 492 to 499 Dba:0x01400001 ------------------------------------------------------------------------ 43b2043f 01000000 BBED> P kcvfhckp struct kcvfhckp, 36 bytes @484 struct kcvcpscn, 8 bytes @484 ub4 kscnbas @484 0x0015071d ub2 kscnwrp @488 0x000a ub4 kcvcptim @492 0x3f04b243 BBED> sum apply Check value for File 5, Block 1: current = 0x7a42, required = 0x7a42 SQL> alter database datafile '/oradata/prod/testtbs01.dbf' online; alter database datafile '/oradata/prod/testtbs01.dbf' online * ERROR at line 1: ORA-01113: file 5 needs media recovery ORA-01110: data file 5: '/oradata/prod/testtbs01.dbf' SQL> recover datafile 5; Media recovery complete. SQL> alter database datafile '/oradata/prod/testtbs01.dbf' online; Database altered.