Dropped Tables with Indexes in Oracle
What Happens to Indexes If You Drop a Table in Oracle?
If you drop a table, what happens to its indexes? The answer is that if a table is dropped, all its indexes will be dropped too. Try the following script to see yourself:
CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name VARCHAR(80) NOT NULL, last_name VARCHAR(80) NOT NULL, birth_date DATE NOT NULL, social_number VARCHAR(80) UNIQUE NOT NULL); Table created. CREATE INDEX student_birth_date ON student(birth_date); Index created. SELECT index_name, table_name, uniqueness FROM USER_INDEXES WHERE table_name = 'STUDENT'; INDEX_NAME TABLE_NAME UNIQUENES ----------------------- --------------------- --------- SYS_C004141 STUDENT UNIQUE SYS_C004142 STUDENT UNIQUE STUDENT_BIRTH_DATE STUDENT NONUNIQUE DROP TABLE STUDENT; Table dropped. SELECT index_name, table_name, uniqueness FROM USER_INDEXES WHERE table_name = 'STUDENT'; no data found
No records in USER_INDEXES view found for your name STUDENT, after you dropped STUDENT table.
⇒ Recover a Dropped Index in Oracle
⇐ Error: Cannot Drop Index on Primary Key in Oracle
⇑ Managing Oracle Table Indexes
2019-04-22, 1285👍, 0💬
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