Does a lock on a parent table locks up alter table disable constraint?

Hi all:

I am encountering a following situation:

• one developer is executing alter table T1 disable foreing key FK1. The FK1 is referrting to a table T2 as a parent table
• another developer is holding a lock on the T2

The first developer's command is stuck until the second one releases the lock. I have seen it several times today Why does this happen? I would understand that an ENABLE command would be affected by that, but why would
a DISABLE command be affected?

thank you

Gene Gurevich

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