Oracle 坏块处理脚本 Applies to:Oracle Database - Enterprise Edition - Version 8.1.7.0 to 12.1.0.1.0 [Release 8.1.7 to 1
Applies to: Oracle Database - Enterprise Edition -Version 8.1.7.0 to 12.1.0.1.0 [Release 8.1.7 to 12.1] Information in this document applies to any platform.
Goal The purpose of this plsql script is to create a new table based on a table that is producing errors such as ORA-8103 or ORA-1410 or ORA-1578. The script skips the blocks/rows producing those errors. This is done when there is not option to restore the table from a backup like applying media recovery or recovering the table from an export or other source. The first option to skip an ORA-1578 error is to use the DBMS_REPAIR script and decide to create a new table using create table as select (CTAS); however if for any reason that does not work use the plsql in this document instead.
Caution This sample code is provided for educational purposes only and not supported by Oracle Support Services. It has been tested internally, however, and works as documented. We do not guarantee that it will work for you, so be sure to test it in your environment before relying on it. Proofread this sample code before using it! Due to the differences in the way text editors, e-mail packages and operating systems handle text formatting (spaces, tabs and carriage returns), this sample code may not be in an executable state when you first receive it. Check over the sample code to ensure that errors of this type are corrected.
Fix
Run sqlplus with SYS or TABLE owner user
Example:
sqlplus '/ as sysdba' or sqlplus
/ password
SKIP ORA-1578 ORA-8103 ORA-1410
REM Create a new table based on the table that is producing errors with no rows:
create table as select * from where 1=2;
REM Create the table to keep track of ROWIDs pointing to affected rows:
create table bad_rows (row_id rowid ,oracle_error_code number); set serveroutput on
DECLARE TYPE RowIDTab IS TABLE OF ROWID INDEX BY BINARY_INTEGER; CURSOR c1 IS select /*+ index(tab1) */ rowid from tab1 where is NOT NULL; r RowIDTab; rows NATURAL := 20000; bad_rows number := 0 ; errors number; error_code number; myrowid rowid; BEGIN OPEN c1; LOOP FETCH c1 BULK COLLECT INTO r LIMIT rows; EXIT WHEN r.count=0; BEGIN FORALL i IN r.FIRST..r.LAST SAVE EXCEPTIONS insert into select /*+ ROWID(A) */ from A where rowid = r(i); EXCEPTION when OTHERS then BEGIN errors := SQL%BULK_EXCEPTIONS.COUNT; FOR err1 IN 1..errors LOOP error_code := SQL%BULK_EXCEPTIONS(err1).ERROR_CODE; if error_code in (1410, 8103, 1578) then myrowid := r(SQL%BULK_EXCEPTIONS(err1).ERROR_INDEX); bad_rows := bad_rows + 1; insert into bad_rows values(myrowid, error_code); else raise; end if; END LOOP; END; END; commit; END LOOP; commit; CLOSE c1; dbms_output.put_line('Total Bad Rows: '||bad_rows); END; /
Notes:
Replace the next values in the plsql script by the values of the affected table: , , The idea is to get the rowid's from an existent index, then get all the columns from the table for each rowid and insert these rows into the new table. Using the "index" hint, allows the optimizer to choose the most appropriated index to scan the table based on the indexed column. Make sure that the select in the plsql is using an index. One way to verify if the index is used is to get an execution plan from sqlplus:
set autotrace trace explain select /*+ index(tab1) */ rowid from tab1 where is NOT NULL;
Note that the plsql executes an INSERT for 20000 rows and COMMIT. If it is required to change this, adjust the value of rows. e.g.:
rows NATURAL := 50000; -> to insert 50000 rows in one execution of INSERT and commit every 50000 records. If 'Total Bad Rows:' displays 0 and it is known for certain that there is a block incorrect on disk that is causing the ORA-8103, , then it means that the block is empty (no rows) and there is not data loss.
SKIP ORA-600
This is useful when the ORA-600 is produced by a non-existent chained row (invalid nrid) like ORA-600 [kdsgrp1] and when event 10231 does not work. If the problem is caused in an Index Organized Table (IOT) change ROWID by UROWID for the row_id column in table bad_rows.
drop table bad_rows; create table bad_rows (row_id ROWID ,oracle_error_code number);
rem Create the new empty table:
create table &&new_table as select * from &&affected_table where 1=2;
set serveroutput on declare n number:=0; bad_rows number := 0; error_code number; ora600 EXCEPTION; PRAGMA EXCEPTION_INIT(ora600, -600); begin for i in (select rowid rid from &&affected_table) loop begin insert into &&new_table select * from &&affected_table where rowid=i.rid; n:=n+1; exception when ora600 then bad_rows := bad_rows + 1; insert into bad_rows values(i.rid,600); commit; when others then error_code:=SQLCODE; bad_rows := bad_rows + 1; insert into bad_rows values(i.rid,error_code); commit; end; end loop; dbms_output.put_line('Total Bad Rows: '||bad_rows); dbms_output.put_line('Total Good rows: '||n); end; /
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