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oracle - blocking reads

Jeanne Boyarsky
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Joined: May 26, 2003
Posts: 30123
    
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In our Oracle 9 application, the read only (JDBC) queries block when we are updating the database. The updates occur within entity beans in a transaction with an isolation level of committed.

Is it possible to get the queries to retrieve the last committed data rather than block?


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Adeel Ansari
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Joined: Aug 15, 2004
Posts: 2874
By saying updating database, you mean updating some particular rows of a particular table, right??

if it is like that then the behaviour is wiered.

Because in oracle, while updating rows, the previous committed rows, that are being changed, is written to a rollback segment. And when some other user executes query on that table then he/she doesn't get the uncommitted changed rows, but committed old rows from rollback segment.
Jeanne Boyarsky
internet detective
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Joined: May 26, 2003
Posts: 30123
    
150

Adeel,
Yes, I mean updating some rows in a database.

Thanks for confirming my understanding of this at least. I guess I'll experiment with transaction settings to see if I am somehow supressing this behavior.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: oracle - blocking reads
 
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