Skip to main content

What is Oracle RECYCLEBIN ?

RECYCLEBIN is one of the new and core feature of version 10G.

This is similar to recyclebin on Mircosoft Windows. In MS Windows temporarily deleted files are kept in recyclebin and you can selectively restore the files you want. Similar to this option Oracle came up with RECYCLEBIN where in dropped tables are kept in RECYCLEBIN and you can selectively restore the tables.

SQL> desc recyclebin
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 OBJECT_NAME                               NOT NULL VARCHAR2(30)
 ORIGINAL_NAME                                      VARCHAR2(32)
 OPERATION                                          VARCHAR2(9)
 TYPE                                               VARCHAR2(25)
 TS_NAME                                            VARCHAR2(30)
 CREATETIME                                         VARCHAR2(19)
 DROPTIME                                           VARCHAR2(19)
 DROPSCN                                            NUMBER
 PARTITION_NAME                                     VARCHAR2(32)
 CAN_UNDROP                                         VARCHAR2(3)
 CAN_PURGE                                          VARCHAR2(3)
 RELATED                                   NOT NULL NUMBER
 BASE_OBJECT                               NOT NULL NUMBER
 PURGE_OBJECT                              NOT NULL NUMBER
 SPACE                                              NUMBER

SQL> select * from recyclebin;

no rows selected

SQL> show recyclebin
SQL> create table emp211 as select * from emp;

Table created.

SQL> select count(*) from emp211;


SQL> drop table emp211;

Table dropped.

SQL> show recyclebin;
---------------- ------------------------------ ------------ -------------------
EMP211           BIN$TGK1xTOaRLqOzs3TRtxHvQ==$0 TABLE        2011-08-16:07:59:42

SQL> flashback table emp211 to before drop;

Flashback complete.

SQL> select count(*) from emp211;


To permanently delete all tables in recyclebin, use the following statement.

SQL> purge table emp211;

Table purged.

To drop all the tables in recyclebin use the following statement.

SQL> purge recyclebin;

Recyclebin purged.


Popular posts from this blog

Basics of RDBMS

Data Small set of information becomes data, this set of information helps make decision. Data is always some useful information. Database Place where you store the data. Database represents some aspect of the real world called "miniworld". A database is designed, built and populated with data for a specific purpose. It has intended group of users and some preconceived applications in which these users are interested. In other words, a database has some source from which data is derived, some degree of interaction with events in the real world and an audience that is actively interested in the contents of the database. Database can also be defined as collection of one or more tables. Ex: Mobile, human brain etc DBMS (Database Management System ) Is a program that stores retrieves and modifies data in the database on request. Study of different techniques of design, development and maintenance of the database Types of DBMS These types are based upon their m

SQL Interview Questions on Subqueries

SUB Queries: 1. List the employees working in research department 2. List employees who are located in New York and Chicago 3. Display the department name in which ANALYSTS are working 4. Display employees who are reporting to JONES 5. Display all the employees who are reporting to Jones Manager 6. Display all the managers in SALES and ACCOUNTING department 7. Display all the employee names in Research and Sales Department who are having at least 1 person reporting to them 8. Display all employees who do not have any reportees 9. List employees who are having at least 2 reporting 10. List the department names which are having more than 5 employees 11. List department name having at-least 3 salesman 12. List employees from research and accounting having at-least 2 reporting 13. Display second max salary 14. Display 4th max salary 15. Display 5th max salary  -- Answer for nth Max Salary Co-Related Subqueries: 16. Write a query to get 4th max salary from EMP table 17. Wri

Answers for SQL Functions

1. SQL> SELECT empno, ename FROM emp WHERE Length(ename) = 4; 2. SQL> SELECT empno, ename, job FROM emp where Length(job)=7; 3. SQL> SELECT Length('qspiders') - Length(replace('qspiders','s','')) FROM dual; 4. SQL>  SELECT empno, ename, job FROM emp WHERE Instr(job,'MAN') >0; 5. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job, 'MAN') =1; 6. SQL> SELECT empno, ename, job FROM emp WHERE (Length(ename) - Length(Replace(ename, 'L',''))) = 1; 7. SQL> SELECT * FROM dept WHERE Instr(dname,'O') > 0; 8. SQL> SELECT Concat(ename,' working as a ') || Concat(job, ' earns ') || Concat(sal, '  in ') || Conc at('dept ',deptno) AS text from emp; OR SQL> SELECT Concat(Concat(Concat(Concat(Concat(Concat(Concat(ename,' working as a '), job),' earns '), sal),'  in '),'dept '), deptno) AS text FROM emp; 9. SQL