On 11/27/22 10:58, Scott Ribe wrote:
On Nov 27, 2022, at 9:51 AM, Samed YILDIRIM <samed@reddoc.net> wrote:
Important point is why you want to disable a unique constraint. • If you want to add some duplicate rows into a table, you try to do something fundamentally wrong.
Even more so: why is disabling superior to dropping???
It is at most an extremely minor convenience to be able to re-enable it without having to re-create it, in that you can, presumably, just re-enable by name without specifying the constraint details. In other words, in my opinion, it is a virtually worthless feature. (Typical "enterprise software" feature creep.)
Being an "enterprise dba", IMNSHO "disable constraint" (and more specifically "
disable index") is a
great feature for maintaining tables. For example, if you need to purge a
lot of records into a table, disable all indices except the index supporting your WHERE CLAUSE, delete the data, and then re-enable the indices. Bonus points if the REENABLE commands can be done in parallel.
Sure, you
can dig around for all of the CREATE INDEX statements, but that leads to possible errors: "oops, forgot to recreate one of them", or "typo caused one to fail". OTOH, DISABLE INDEX and REENABLE INDEX are idiot-proof, and can be automated.
--
Angular momentum makes the world go 'round.