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  • 【Oracle】使用bbed手动提交事务

    有时候数据库挂掉,起库会出现ORA-00704错误,而导致ORA-00704错误的根本原因是訪问OBJ$的时候。ORACLE须要回滚段中的数据,而訪问回滚段的时候须要的undo数据已经被覆盖,此时我们能够通过bbed工具手工提交事务。从而解决问题

    使用bbed提交事务測试步骤例如以下:

    JP@ORCL>create table JP_BBED_TEST as select * from hr.employees where rownum<=10;

     

    Table created.

     

    JP@ORCL>select rowid, dbms_rowid.rowid_relative_fno(rowid)rel_fno,

    dbms_rowid.rowid_block_number(rowid)blockno,

    dbms_rowid.rowid_row_number(rowid) rowno

    from jp_bbed_test;  2    3    4  

     

    ROWID                 REL_FNO    BLOCKNO      ROWNO

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

    AAAM7wAAEAAAAGcAAA          4        412          0

    AAAM7wAAEAAAAGcAAB          4        412          1

    AAAM7wAAEAAAAGcAAC          4        412          2

    AAAM7wAAEAAAAGcAAD          4        412          3

    AAAM7wAAEAAAAGcAAE          4        412          4

    AAAM7wAAEAAAAGcAAF          4        412          5

    AAAM7wAAEAAAAGcAAG          4        412          6

    AAAM7wAAEAAAAGcAAH          4        412          7

    AAAM7wAAEAAAAGcAAI          4        412          8

    AAAM7wAAEAAAAGcAAJ          4        412          9

     

    10 rows selected.

     

    JP@ORCL>select last_name from jp_bbed_test;

     

    LAST_NAME

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

    OConnell

    Grant

    Whalen

    Hartstein

    Fay

    Mavris

    Baer

    Higgins

    Gietz

    King

     

    10 rows selected.

     

    JP@ORCL>update jp_bbed_test set LAST_NAME='BADLY9';

     

    10 rows updated.

     

    此时事务没有提交,其它的session是无法查看此时的改动的。

    另开一个窗体

    [oracle@jp bbed]$ sqlplus / as sysdba

     

    SQL*Plus: Release 10.2.0.1.0 - Production on Fri Jun 6 06:56:52 2014

     

    Copyright (c) 1982, 2005, Oracle.  All rights reserved.

     

     

    Connected to:

    Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production

    With the Partitioning, OLAP and Data Mining options

     

    SYS@ORCL>alter system checkpoint;

     

    System altered.

     

    SYS@ORCL>alter system dump datafile 4 block 412;

     

    System altered.

     

    SYS@ORCL>oradebug setmypid

    Statement processed.

    SYS@ORCL>oradebug tracefile_name

    /u01/app/oracle/admin/ORCL/udump/orcl_ora_17715.trc

    查看/u01/app/oracle/admin/ORCL/udump/orcl_ora_17715.trc文件

    我们能够看到下面内容:

    Block header dump:  0x0100019c

     Object id on Block?

     Y

     seg/obj: 0xcef0  csc: 0x00.c3cf8  itc: 3  flg: E  typ: 1 - DATA

         brn: 0  bdba: 0x1000199 ver: 0x01 opc: 0

         inc: 0  exflg: 0

     

     Itl           Xid                  Uba         Flag  Lck        Scn/Fsc

    0x01   0xffff.000.00000000  0x00000000.0000.00  C---    0  scn 0x0000.000c3cf8

    0x02   0x0006.02b.000001a1  0x008000d0.00f6.2a  ----   10  fsc 0x0000.00000000

    0x03   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000

    这里能够看到我们LCK10条表中记录

    这时候我们使用bbed将事务提交:

    首先使用session2 flush buffer_pool。假设不清空buffer pool。再次读取该block时将不会进行物理读,无法看到改动后的结果并且会覆盖我们的改动:

    SYS@ORCL>alter system flush buffer_cache;

     

    System altered.

    使用bbed工具进行改动:

    BBED> set dba 4,412

            DBA             0x0100019c (16777628 4,412)

     

    BBED> map

     File: /u01/app/oracle/oradata/ORCL/users01.dbf (4)

     Block: 412                                   Dba:0x0100019c

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

     KTB Data Block (Table/Cluster)

     

     struct kcbh, 20 bytes                      @0       

     

     struct ktbbh, 96 bytes                     @20      

     

     struct kdbh, 14 bytes                      @124     

     

     struct kdbt[1], 4 bytes                    @138     

     

     sb2 kdbr[10]                               @142     

     

     ub1 freespace[6794]                        @162     

     

     ub1 rowdata[1232]                          @6956    

     

     ub4 tailchk                                @8188    

     

     

    BBED> p ktbbh 

    struct ktbbh, 96 bytes                      @20      

       ub1 ktbbhtyp                             @20       0x01 (KDDBTDATA)

       union ktbbhsid, 4 bytes                  @24      

          ub4 ktbbhsg1                          @24       0x0000cef0

          ub4 ktbbhod1                          @24       0x0000cef0

       struct ktbbhcsc, 8 bytes                 @28      

          ub4 kscnbas                           @28       0x000c3cf8

          ub2 kscnwrp                           @32       0x0000

       b2 ktbbhict                              @36       3

       ub1 ktbbhflg                             @38       0x32 (NONE)

       ub1 ktbbhfsl                             @39       0x00

       ub4 ktbbhfnx                             @40       0x01000199

       struct ktbbhitl[0], 24 bytes             @44      

          struct ktbitxid, 8 bytes              @44      

             ub2 kxidusn                        @44       0xffff

             ub2 kxidslt                        @46       0x0000

             ub4 kxidsqn                        @48       0x00000000

          struct ktbituba, 8 bytes              @52      

             ub4 kubadba                        @52       0x00000000

             ub2 kubaseq                        @56       0x0000

             ub1 kubarec                        @58       0x00

          ub2 ktbitflg                          @60       0x8000 (KTBFCOM)

          union _ktbitun, 2 bytes               @62      

             b2 _ktbitfsc                       @62       0

             ub2 _ktbitwrp                      @62       0x0000

          ub4 ktbitbas                          @64       0x000c3cf8

       struct ktbbhitl[1], 24 bytes             @68      

          struct ktbitxid, 8 bytes              @68      

             ub2 kxidusn                        @68       0x0006

             ub2 kxidslt                        @70       0x002b

             ub4 kxidsqn                        @72       0x000001a1

          struct ktbituba, 8 bytes              @76      

             ub4 kubadba                        @76       0x008000d0

             ub2 kubaseq                        @80       0x00f6

             ub1 kubarec                        @82       0x2a

          ub2 ktbitflg                          @84       0x000a (NONE)

          union _ktbitun, 2 bytes               @86      

             b2 _ktbitfsc                       @86       0

             ub2 _ktbitwrp                      @86       0x0000

          ub4 ktbitbas                          @88       0x00000000

       struct ktbbhitl[2], 24 bytes             @92      

          struct ktbitxid, 8 bytes              @92      

             ub2 kxidusn                        @92       0x0000

             ub2 kxidslt                        @94       0x0000

             ub4 kxidsqn                        @96       0x00000000

          struct ktbituba, 8 bytes              @100     

             ub4 kubadba                        @100      0x00000000

             ub2 kubaseq                        @104      0x0000

             ub1 kubarec                        @106      0x00

          ub2 ktbitflg                          @108      0x0000 (NONE)

          union _ktbitun, 2 bytes               @110     

             b2 _ktbitfsc                       @110      0

             ub2 _ktbitwrp                      @110      0x0000

          ub4 ktbitbas                          @112      0x00000000

    关于事务的状态例如以下:
    TRANSACTION_COMMITED = 0×08;
    TRANSACTION_UPBOUND = 0×02;
    TRANSACTION_ACTIVE = 0×01;

    BBED> m /x 0080 offset 84      

     File: /u01/app/oracle/oradata/ORCL/users01.dbf (4)

     Block: 412              Offsets:   84 to  595           Dba:0x0100019c

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

     00800000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00010a00 ffff2600 b01aac1c ac1c0000 0a008e1c 481cac1e 

     021cc41b e51d811b 391bf01a b01a0000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 

     

     <32 bytes per line>

     

    BBED> p ktbbh 

    struct ktbbh, 96 bytes                      @20      

       ub1 ktbbhtyp                             @20       0x01 (KDDBTDATA)

       union ktbbhsid, 4 bytes                  @24      

          ub4 ktbbhsg1                          @24       0x0000cef0

          ub4 ktbbhod1                          @24       0x0000cef0

       struct ktbbhcsc, 8 bytes                 @28      

          ub4 kscnbas                           @28       0x000c3cf8

          ub2 kscnwrp                           @32       0x0000

       b2 ktbbhict                              @36       3

       ub1 ktbbhflg                             @38       0x32 (NONE)

       ub1 ktbbhfsl                             @39       0x00

       ub4 ktbbhfnx                             @40       0x01000199

       struct ktbbhitl[0], 24 bytes             @44      

          struct ktbitxid, 8 bytes              @44      

             ub2 kxidusn                        @44       0xffff

             ub2 kxidslt                        @46       0x0000

             ub4 kxidsqn                        @48       0x00000000

          struct ktbituba, 8 bytes              @52      

             ub4 kubadba                        @52       0x00000000

             ub2 kubaseq                        @56       0x0000

             ub1 kubarec                        @58       0x00

          ub2 ktbitflg                          @60       0x8000 (KTBFCOM)

          union _ktbitun, 2 bytes               @62      

             b2 _ktbitfsc                       @62       0

             ub2 _ktbitwrp                      @62       0x0000

          ub4 ktbitbas                          @64       0x000c3cf8

       struct ktbbhitl[1], 24 bytes             @68      

          struct ktbitxid, 8 bytes              @68      

             ub2 kxidusn                        @68       0x0006

             ub2 kxidslt                        @70       0x002b

             ub4 kxidsqn                        @72       0x000001a1

          struct ktbituba, 8 bytes              @76      

             ub4 kubadba                        @76       0x008000d0

             ub2 kubaseq                        @80       0x00f6

             ub1 kubarec                        @82       0x2a

          ub2 ktbitflg                          @84       0x8000 (KTBFCOM)

          union _ktbitun, 2 bytes               @86      

             b2 _ktbitfsc                       @86       0

             ub2 _ktbitwrp                      @86       0x0000

          ub4 ktbitbas                          @88       0x00000000

       struct ktbbhitl[2], 24 bytes             @92      

          struct ktbitxid, 8 bytes              @92      

             ub2 kxidusn                        @92       0x0000

             ub2 kxidslt                        @94       0x0000

             ub4 kxidsqn                        @96       0x00000000

          struct ktbituba, 8 bytes              @100     

             ub4 kubadba                        @100      0x00000000

             ub2 kubaseq                        @104      0x0000

             ub1 kubarec                        @106      0x00

          ub2 ktbitflg                          @108      0x0000 (NONE)

          union _ktbitun, 2 bytes               @110     

             b2 _ktbitfsc                       @110      0

             ub2 _ktbitwrp                      @110      0x0000

          ub4 ktbitbas                          @112      0x00000000

     

    BBED> sum apply

    Check value for File 4, Block 412:

    current = 0x14cc, required = 0x14cc

     

    BBED> exit

    这时候重开一个session查看该表信息:

    SYS@ORCL>select last_name from jp.jp_bbed_test;

     

    LAST_NAME

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

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

    BADLY9

     

    10 rows selected.

    尽管session1的事务没有提交但此时其它session已经能够查看该改动结果。

    有时改动完ktbitflg之后其它session仍然不能查看改动结果,此时使用bbedub2 _ktbitwrp改动为0就可以查看到改动后的结果。

    须要注意的是假设此时session 1仍然能够将该事务进行回滚。

    Session 1

    JP@ORCL>rollback;

     

    Rollback complete.

    Session 3

    JP@ORCL>select last_name from jp_bbed_test;

     

    LAST_NAME

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

    OConnell

    Grant

    Whalen

    Hartstein

    Fay

    Mavris

    Baer

    Higgins

    Gietz

    King

     

    10 rows selected.

     

     

     

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  • 原文地址:https://www.cnblogs.com/ldxsuanfa/p/10765077.html
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