Mark Bad blocks and repair Bad blocks with BBED

Create a test table: ZBDBA @ orcl11gselect * fromzbdba; NAME alias @ orcl11gZBDBA @ orcl11gZBDBA @ orcl11gZBDBA @ orcl11gZBDBA @ alias, alias (rowid) robject,

Create a test table: ZBDBA @ orcl11gselect * from zbdba; NAME alias @ orcl11gZBDBA @ orcl11gZBDBA @ orcl11gZBDBA @ alias @ orcl11gselect rowid, then (rowid) robject,

Create a test table:

ZBDBA@orcl11g>select * from zbdba;NAME------------------------------------------------------------zbdbahuihuiZBDBA@orcl11g>ZBDBA@orcl11g>ZBDBA@orcl11g>ZBDBA@orcl11g>ZBDBA@orcl11g>select rowid,dbms_rowid.rowid_object(rowid) robject,  2  dbms_rowid.rowid_relative_fno(rowid) fno,  3  dbms_rowid.rowid_block_number(rowid) bno,  4  dbms_rowid.rowid_row_number(rowid) rno from zbdba where rownum=1;ROWID                 ROBJECT        FNO        BNO        RNO------------------ ---------- ---------- ---------- ----------AAASMNAAGAAAAC/AAA      74509          6        191          0

Use bbed to modify the block status:

BBED> set file 6 block 191        FILE#           6        BLOCK#          191BBED> mapFile: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 191                                   Dba:0x018000bf------------------------------------------------------------KTB Data Block (Table/Cluster)struct kcbh, 20 bytes                      @0      struct ktbbh, 72 bytes                     @20     struct kdbh, 14 bytes                      @100    struct kdbt[1], 4 bytes                    @114    sb2 kdbr[2]                                @118    ub1 freespace[8047]                        @122    ub1 rowdata[19]                            @8169   ub4 tailchk                                @8188   BBED> p kcbhstruct kcbh, 20 bytes                       @0         ub1 type_kcbh                            @0        0x06   ub1 frmt_kcbh                            @1        0xa2   ub1 spare1_kcbh                          @2        0x00   ub1 spare2_kcbh                          @3        0x00   ub4 rdba_kcbh                            @4        0x018000bf   ub4 bas_kcbh                             @8        0x005036cd   ub2 wrp_kcbh                             @12       0x0000   ub1 seq_kcbh                             @14       0x01   ub1 flg_kcbh                             @15       0x06 (KCBHFDLC, KCBHFCKV)   ub2 chkval_kcbh                          @16       0x426d   ub2 spare3_kcbh                          @18       0x0000BBED> modify /x ff offset 14Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) yFile: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 191              Offsets:   14 to  525           Dba:0x018000bf------------------------------------------------------------------------ff066d42 00000100 00000d23 01009636 50000000 00000200 3200b800 8001130002001800 0000e90b 80021100 38000220 0000cd36 50000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000001 0200ffff 1600851f6f1f6f1f 00000200 8f1f851f 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000<32 bytes per line>BBED> p kcbhstruct kcbh, 20 bytes                       @0         ub1 type_kcbh                            @0        0x06   ub1 frmt_kcbh                            @1        0xa2   ub1 spare1_kcbh                          @2        0x00   ub1 spare2_kcbh                          @3        0x00   ub4 rdba_kcbh                            @4        0x018000bf   ub4 bas_kcbh                             @8        0x005036cd   ub2 wrp_kcbh                             @12       0x0000   ub1 seq_kcbh                             @14       0xff   ub1 flg_kcbh                             @15       0x06 (KCBHFDLC, KCBHFCKV)   ub2 chkval_kcbh                          @16       0x426d   ub2 spare3_kcbh                          @18       0x0000BBED> sum applyCheck value for File 6, Block 191:current = 0x4293, required = 0x4293

Go back to the database to view the table:

ZBDBA@orcl11g>select * from zbdba;select * from zbdba              *ERROR at line 1:ORA-01578: ORACLE data block corrupted (file # 6, block # 191)ORA-01110: data file 6: '/opt/oracle/oradata/orcl11g/zbdba01.dbf'

Conventional Bad Block Processing Methods:
1. event 10231
2. rowid Extraction
3. DBMS_REPAIR

Here I use bbed to fix this block:

BBED> p kcbhstruct kcbh, 20 bytes                       @0         ub1 type_kcbh                            @0        0x06   ub1 frmt_kcbh                            @1        0xa2   ub1 spare1_kcbh                          @2        0x00   ub1 spare2_kcbh                          @3        0x00   ub4 rdba_kcbh                            @4        0x018000bf   ub4 bas_kcbh                             @8        0x005036cd   ub2 wrp_kcbh                             @12       0x0000   ub1 seq_kcbh                             @14       0xff   ub1 flg_kcbh                             @15       0x06 (KCBHFDLC, KCBHFCKV)   ub2 chkval_kcbh                          @16       0x4293   ub2 spare3_kcbh                          @18       0x0000BBED> p tailchkub4 tailchk                                 @8188     0x36cd0601

Here, the tailchk information is correct and does not need to be modified.

BBED> modify /x 01 offset 14Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) yFile: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 191              Offsets:   14 to  525           Dba:0x018000bf------------------------------------------------------------------------01069342 00000100 00000d23 01009636 50000000 00000200 3200b800 8001130002001800 0000e90b 80021100 38000220 0000cd36 50000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000001 0200ffff 1600851f6f1f6f1f 00000200 8f1f851f 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000<32 bytes per line>BBED> p kcbhstruct kcbh, 20 bytes                       @0         ub1 type_kcbh                            @0        0x06   ub1 frmt_kcbh                            @1        0xa2   ub1 spare1_kcbh                          @2        0x00   ub1 spare2_kcbh                          @3        0x00   ub4 rdba_kcbh                            @4        0x018000bf   ub4 bas_kcbh                             @8        0x005036cd   ub2 wrp_kcbh                             @12       0x0000   ub1 seq_kcbh                             @14       0x01   ub1 flg_kcbh                             @15       0x06 (KCBHFDLC, KCBHFCKV)   ub2 chkval_kcbh                          @16       0x4293   ub2 spare3_kcbh                          @18       0x0000BBED> sum applyCheck value for File 6, Block 191:current = 0x426d, required = 0x426dBBED> verifyDBVERIFY - Verification startingFILE = /opt/oracle/oradata/orcl11g/zbdba01.dbfBLOCK = 191DBVERIFY - Verification completeTotal Blocks Examined         : 1Total Blocks Processed (Data) : 1Total Blocks Failing   (Data) : 0Total Blocks Processed (Index): 0Total Blocks Failing   (Index): 0Total Blocks Empty            : 0Total Blocks Marked Corrupt   : 0Total Blocks Influx           : 0Message 531 not found;  product=RDBMS; facility=BBED

Query the database again:

ZBDBA@orcl11g>select * from zbdba;NAME------------------------------------------------------------zbdbahuihui