Nickolay Samofatov wrote:

>Hello, All !
>
>Could kindly gurus answer my dummy question ? The question is:
>What lock manager operations are safe to perform at AST level ?
>
>
>
>

Generally speaking, only downgrades and releases. Requesting a lock at
AST level could
kick off another AST which might deadlock the lock manager. Since the
architecture only
requires downgrades and releases, it is likely that nothing else has
been tried, let along
exhaustively tested.

Why are you trying to do?