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enq: TM - contention

User_3YG3JJun 30 2015 — edited Jun 30 2015

Hello Everyone,

Just One day before one Developer told me that my application hangs too much. So when it hangs next time I queried v$session and in the event I found 'enq: TM - contention'. So I google this event and I found that there is a locking issue of table. So making an index in the foreign key column will solve your problem and problem is solved.

But I want to know How index comes into the picture ? What index actually doing that cause my issue to be resolved.

Please help me out to understand this.

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Added on Jun 30 2015
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