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Finding BlockNumber Using Rowid

Document TypeㅣTechnical Information

FieldㅣManagement/Configuration

Document NumberㅣTADTI067

 

Overview

This explains how to check the Block Number of data using the Rowid value. This method can be verified through the DBMS_ROWID package.
 
 
 

Method

Using the DBMS_ROWID Package

To find the Blocknumber from a Rowid, the DBMS_ROWID package is used.
  • dbms_rowid.rowid_absolute_fno function returns the file number from the given rowid.
  • dbms_rowid.rowid_block_number function returns the block number within the file from the given rowid.
  • dbms_rowid.rowid_row_number function returns the row number within the block from the given rowid.
 

Example Usage

Below is a simple example showing how to query the file number, block number, and row number from a rowid.
drop table test;
create table test(n number);

insert into test values (1);
commit;

select rowid,
dbms_rowid.rowid_absolute_fno(rowid) "fno",
dbms_rowid.rowid_block_number(rowid) "bno",
dbms_rowid.rowid_row_number(rowid) "rno" from test;
 

Sample Execution Result

SQL> select rowid,
  2    dbms_rowid.rowid_absolute_fno(rowid) "fno",
  3    dbms_rowid.rowid_block_number(rowid) "bno",
  4    dbms_rowid.rowid_row_number(rowid) "rno"
  5  from test;

ROWID                 fno     bno      rno
------------------ ------- ------- -------
AAAAadAACAAAABAAAA      2      64        0

1 row selected.
 
 
 
 
 

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