A PROCEDURE to work out a coherent set of data

We have a PROCEDURE that writes the results of each of the eight queries in the file. Data are not necessarily consistent with the files because the PROCEDURE takes some time to complete and users can change the data through the user interface while it is running.

Is it possible to have the PROCEDURE (or PACKAGE) to work on a consistent set of data?

You can quote out of context.

  • READ ONLY is an Oracle implementation only.
  • REPEATABLE READ is a standard, not an Oracle implementation.
  • SERIALIZABLE is the name of a standard, and is also the name of an Oracle implementation.

READ ONLY has the same effect as the two standards, except that you cannot modify the data. However, the READ ONLY and SERIALIZABLE implementations are very different.

If you say SERIALIZABLE, you tell Oracle to throw an exception if you never access the data that someone else has changed. The idea is, you want the database to behave as if you were the single active user; If someone changes the data you are interested in, this is no longer true and Oracle lets you know who.

If you say READ ONLY, Oracle only will not raise an exception, it will just show you data as it was when you started the transaction.

Very different effects in practice.

Tags: Database

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