How to use oracle rowid

How to use oracle rowid

1. Create a temporary table
Create table test_rowid (id number, row_id rowid );
2. Insert a row of records
Insert into test_rowid values (1, null );
3. Modify the inserted record
Update test_rowid set row_id = rowid where id = 1;
4. View rowid
Select rowid, row_id from test_rowid;
The returned result is:
Rowid row_id
AAAO0DAAJAAAAMYAAA AAAO0DAAJAAAAMYAAA

Oracle's physical extended ROWID has 18 bits, each of which uses 64-bit encoding, respectively using ~ Z, ~ Z, 0 ~ 9, +,/represents a total of 64 characters. A Indicates 0, B Indicates 1 ,...... Z indicates 25, a indicates 26 ,...... Z indicates, 0 indicates 52 ,......, 9 indicates 61, + indicates 62,/indicates 63.

ROWID can be divided into four parts.

(1). OOOOOO: the first six digits represent the data object number. After converting the NUMBER, match the DATA_OBJECT_ID in DBA_OBJECTS to determine the table information.

In the preceding example, the data object number is AAAO0D, and the conversion bit NUMBER is 14 × 64 × 64 + 52 × 64 + 3.
Enter the following query:
Select owner, object_name from dba_objects where data_object_id = 14*64*64 + 52*64 + 3;
Return Value:
OWNER OBJECT_NAME
WG TEST_ROWID
(2) FFF: 7th to 9 digits indicate the data file number of the relative tablespace.
In the preceding example, AAJ indicates data file 9.
Enter the following query:
(3). BBBBBB: 10th to 15 digits indicates the BLOCK number of the record in the data file.

The above example is AAAAMY. The conversion bit number is 12 × 64 + 24, which indicates the 792nd blocks of the record in the data file.

(4). RRR: the last three digits indicate the number of records in the BLOCK.

The above example is AAA, indicating 0th records (always counted from 0 ).

Iv. References

1. oracle rowid
2. Analysis of basic Oracle data storage formats (iv) -- ROWID Type (I)
3. Why does the oracle data file have Rfile # and file #

SQL> CREATE TABLE EMP (EMPNO NUMBER (4) NOT NULL,
2 ENAME VARCHAR2 (10 ),
3 JOB VARCHAR2 (9 ),
4 mgr number (4 ),
5 hiredate date,
6 sal number (7, 2 ),
7 comm number (7, 2 ),
8 deptno number (2 ));

Table created.

SQL>
SQL> INSERT INTO EMP VALUES (7369, 'Smith ', 'cler', 7902, TO_DATE ('17-DEC-1980', 'dd-MON-YYYY '), 800, NULL, 20 );

1 row created.

SQL> INSERT INTO EMP VALUES (7499, 'allen', 'salesman', 7698, TO_DATE ('20-FEB-1981 ', 'dd-MON-YYYY'), 1600,300, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7521, 'ward ', 'salesman', 7698, TO_DATE ('22-FEB-1981', 'dd-MON-YYYY '), 1250,500, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7566, 'Jones ', 'manager', 7839, TO_DATE ('2-APR-1981', 'dd-MON-YYYY '), 2975, NULL, 20 );

1 row created.

SQL> INSERT INTO EMP VALUES (7654, 'martin ', 'salesman', 7698, TO_DATE ('28-SEP-1981', 'dd-MON-YYYY '), 1250,140 0, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7698, 'bucke', 'manager', 7839, TO_DATE ('1-MAY-1981 ', 'dd-MON-YYYY'), 2850, NULL, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7782, 'clark', 'manager', 7839, TO_DATE ('9-JUN-1981 ', 'dd-MON-YYYY'), 2450, NULL, 10 );

1 row created.

SQL> INSERT INTO EMP VALUES (7788, 'Scott ', 'analyst', 7566, TO_DATE ('09-DEC-1982', 'dd-MON-YYYY '), 3000, NULL, 20 );

1 row created.

SQL> INSERT INTO EMP VALUES (7839, 'King', 'President ', NULL, TO_DATE ('17-NOV-1981', 'dd-MON-YYYY '), 5000, NULL, 10 );

1 row created.

SQL> INSERT INTO EMP VALUES (7844, 'turner ', 'salesman', 7698, TO_DATE ('8-SEP-1981', 'dd-MON-YYYY '), 1500, 0, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7876, 'adams', 'cler', 7788, TO_DATE ('12-JAN-1983 ', 'dd-MON-YYYY'), 1100, NULL, 20 );

1 row created.

SQL> INSERT INTO EMP VALUES (7900, 'James ', 'cler', 7698, TO_DATE ('3-DEC-1981', 'dd-MON-YYYY '), 950, NULL, 30 );

1 row created.

SQL> INSERT INTO EMP VALUES (7902, 'Ford ', 'analyst', 7566, TO_DATE ('3-DEC-1981', 'dd-MON-YYYY '), 3000, NULL, 20 );

1 row created.

SQL> INSERT INTO EMP VALUES (7934, 'miller ', 'cler', 7782, TO_DATE ('23-JAN-1982', 'dd-MON-YYYY '), 1300, NULL, 10 );

1 row created.

SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER (2), DNAME VARCHAR2 (14), LOC VARCHAR2 (13 ));

Table created.

SQL>
SQL> INSERT INTO DEPT VALUES (10, 'accounting', 'New YORK ');

1 row created.

SQL> INSERT INTO DEPT VALUES (20, 'Research ', 'Dallas ');

1 row created.

SQL> INSERT INTO DEPT VALUES (30, 'sales', 'Chicago ');

1 row created.

SQL> INSERT INTO DEPT VALUES (40, 'operations', 'boston ');

1 row created.

SQL>
SQL> select rowid from emp
2 intersect
3 select rowid from dept;

Instance

SQL> select * from Employee
2/

ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
-----------------------------------------------------------------------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-apr-01232.78 Vancouver Tester

8 rows selected.

SQL>
SQL>
SQL> SELECT ROWID, id FROM employee
2/

ROWID
----------------------
AAAFx7AABAAAKjCAAA 01
AAAFx7AABAAAKjCAAB 02
AAAFx7AABAAAKjCAAC 03
AAAFx7AABAAAKjCAAD 04
AAAFx7AABAAAKjCAAE 05
AAAFx7AABAAAKjCAAF 06
AAAFx7AABAAAKjCAAG 07
AAAFx7AABAAAKjCAAH 08