Unless you specify the PURGE clause, the DROP TABLE statement does not result in space being released back to the tablespace for use by other objects, and the space continues to count toward the user’s space quota. To drop a table that you no longer need, use the DROP TABLE statement. Oracle DROP TABLE statement with syntax and examples. The Oracle DROP TABLE statement allows you to remove or delete a table from the Oracle database.
Normally, a table is moved into the recycle bin (as of Oracle 10g), if it is dropped. However, if the purge modifier is specified as well, the table is unrecoverably (entirely) dropped from the database. Long story short Create table, add some data, drop table with standard drop command with no purge at the end and table does not go to recycle bin and hence can’t use the flashback command to retreive it. Well with some digging on the Doc for Oracle 11g Express, it appears the flashback functionality is not supported. Step 1. Before dropping the table, say TABX, referenced by foreign keys, use two SQLs to generate the following SQL scripts:. Compatible with Oracle 11G R2 + select ‘alter table ‘ t1_table_name ‘ add constraint ‘ t1_constraint_name ‘ foreign key (‘ t1_column_names ‘)’ ‘ references ‘ t2_table_name ‘(‘ t2_column_names ‘);’ FK_script from (select a.
In the Oracle database, I have created my own droptableifexists script. PS: there are also other versions around catching for ORA-942, but ORA-942 may be ORA-943 in next release, try drop table t;; in 11g and 12c to see those things really happen! In Oracle Database 11g, you can make a single table read-only without affecting the other tables in the tablespace. INDEX Statement. The DROP INDEX statement is used to delete an index in a table.
Drop Table If Exists Laurent Schneider
The trick of dropping a table partition without impact the Global Index. He is such an admirable person, he is also an Oracle ACE and he likes to share his knowledge, he was talking us a lot of stories about Oracle, how was Oracle many years ago. Note: This trick also works in 11g (I confirmed it) and I believe in 10g, because it is a conceptual trick not a software trick. Oracle does not have a drop table statement to drop a table if exists, like some other RDBMSes does. If you do not want get error messages for a non-existent table drop operation, you can follow workarounds as I showed below. Oracle – Drop Table If Exists Notes on Oracle 11G R2 Installation on Oracle Ente. In the above step, we are dropping all the tables from Work Schema. The Oracle Data Integrator 11g Certified Implementation Exam! DROP TABLE DEMO_ORDERS CASCADE CONSTRAINTS PURGE;DROP TABLE DEMO_PRODUCT_INFO CASCADE CONSTRAINTS PURGE;DROP TABLE DEMO_CUSTOMERS CASCADE CONSTRAINTS PURGE;DROP TABLE DEPT CASCADE CONSTRAINTS PURGE;DROP TABLE EMP CASCADE CONSTRAINTS PURGE;Triggers, LOBs and Indexes will be dropped along with their associated objects. I am not sure, whether these problems occur also on Oracle Database 11g.