Question: How do I use the
12c online DDL feature?
Answer: (by Earl
Shaffer) Several schema maintenance DDL operations no longer
require blocking locks, making online DDL operations
more non-intrusive and transparent for use in busy online
systems. The improved
schema maintenance DDL operations include these online DDL:
DROP INDEX ONLINE
DROP CONSTRAINT
ONLINE
SET UNUSED COLUMN ONLINE
ALTER INDEX UNUSABLE ONLINE
ALTER INDEX [VISIBLE | INVISIBLE]
Removing the internal
blocking locks enables a simpler and more robust application
development, especially for migrations.
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