suspension and resumption of a proc to the tool DEVELOPER oracle PL/SQL, PL/SQL
I need to test a PL/SQL on how it reacts to an exception. I need to PAUSE, do something outside of the proc and then resume the proc. Is there a command PROMPT in PL/SQL where he would wait for user input? Can I use DBMS_OUTPUT. GET_LINE to do this? Where is raed GET_LINE entry of?user4900730 wrote:
The INSERT will wait forever?
Yes - the lock has been created by the 1st session needs to be released. This is done by a commit or rollback - or something like kill this session which will result in an automatic cancellation.
Remember that it is an application problem. Oracle must simply ensure that the primary key is not violated. It is the application that has decided the how/what/where/when to insert the data.
The only time where Oracle will intervene in this regard is when it detects a deadlock. It is an infinite hung - so Oracle will select one of the sessions involved in the deadlock and kill him. This lead to a cancellation of this session and will allow the other session attached to continue.
This error is stored in the instance's alert log file and a trace file is created - and also marked as an application problem which must be solved at the level of the application.
If yes then I never need to test the duplicates on the VALIDATION. If the waiting is over and oracle allows session B to continue beyond the insert (with the record inserted in homogeneous image read B) so if one commits before B Gets the commit B can get a PK violations on validating DUP?
No, a process can continue pass a lock. She can try the lock with "+ no waiting +"-in which case when he fails to lock, it will not be queued for the lock, but rather throw an exception.
You must decide at the application level, how you're going to deal with this. You wait for access to the line of change/insert? You use without waiting? This framework is an architecture decision. Client-server standard with a dedicated dynamic customer, you can expect. With a Webmail client-server having a customer without a State, you cannot afford to wait.
It is much simpler than in other Oracle databases. Readers do not block writers. Writers do not block readers. Writers can only block other Scriptures when pretending to write the same data (rows). Thus, you should only have to worry about writing the data of same (and no lock escalation, or readers, writers, etc. of blocking as is the case in other RDBMS products).
Is there any place in the oracle documentation that deals with this.
[Concepts of Oracle® database | http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/consist.htm#i13945] has a section on to data concurrency and consistency.
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