Blocking problem

Hello

We had a blocking problem when insert 2 instructions were trying to insert into the same table. I don't see a reason why 2 commands insert should cause a blocking problem, but it was indeed happening. The table had no triggers, partitions or bitmap indexes. However the table had 2 unique index and primary key constraints.

Can someone please advice on this? What can be the reason for the impasse here?

Oracle Version: 11.1

Thank you

create table t1 (key primary number n1);

session 1: insert into t1 values (1);

session 2: insert into t1 values (2);

session 1: insert into t1 values (2);  -wait session 2 to rollback or commit

session 2: insert into t1 values (1);  -waiting for the session 1 to rollback or commit.

In the seconds 3 session 1 will throw an exception of blocking, session 2 will continue waiting

Collisions on the uncommitted inserts, updates or deletes on primary, unique (or foreign) keys can cause expected, which means that you can engineer blockages.

Concerning

Jonathan Lewis

Tags: Database

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