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That is, to reserve a block of time for resource X, he locked the single row in the RESOURCES table for X and then modified the SCHEDULES table So, in addition to performing the preceding count(*), the developer first performed the following: select * from resources where resource_name = :room_name FOR UPDATE; What he did here was to lock the resource (the room) to be scheduled immediately before scheduling it in other words, before he queries the SCHEDULES table for that resource By locking the resource he is trying to schedule, the developer ensures that no one else is modifying the schedule for this resource simultaneously Everyone else must wait until he commits his transaction, at which point they will be able to see his schedule The chance of overlapping schedules is removed.

Thus, in the case of auto-extensible undo tablespaces, Oracle will Retain undo data a little longer than the longest query in your database, if space allows it Retain undo data at least as long as the low threshold of undo retention, subject to space limitations If you use a fixed-size undo tablespace, Oracle will ignore any UNDO_RETENTION value you may have set The database will automatically tune undo with the goal of achieving the maximum possible retention period, given the undo tablespace size and its usage history Of course, if you use the guaranteed undo retention feature, as explained later in this chapter, Oracle will have to honor any UNDO_RETENTION period you set If you ve specified any Flashback requirements, Oracle will satisfy them as well.

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If you re considering a fixed size and an auto-extensible tablespace of the same size, know that the fixed-size tablespace will provide you with a slightly longer undo retention period Even if you do set a value for the UNDO_RETENTION parameter, Oracle will still auto-tune undo, with the value you specified as the minimum value Note that the value you assign for the UNDO_RETENTION parameter is treated by Oracle as a requested minimum If Oracle determines, through its automatic tuning, that the undo retention period should be longer than this requested minimum to accommodate long transactions, it will retain undo data for the longer retention period..

This is all it takes. If your undo segments are sized such that they have a good chance of being reused during the execution of your queries, and your queries access data that will probably be modified, you stand a very good chance of hitting the ORA-01555 error on a recurring basis. If this is the case, you must set your UNDO_RETENTION parameter higher and let Oracle take care of figuring out how much undo to retain (this is the suggested approach; it s much easier than trying to figure out the perfect undo size yourself) or resize your undo segments and make them larger (or have more of them). You need enough undo configured to last as long as your long-running queries. The system was sized for the transactions that modify data you forgot to size for the other components of the system.

Developers must understand that, in the multiuser environment, they must at times employ techniques similar to those used in multithreaded programming The FOR UPDATE clause is working like a semaphore in this case It serializes access to the RESOURCES tables for that particular row ensuring no two people can schedule it simultaneously My suggestion was to make this logic a transaction API that is, bundle all of the logic into a stored procedure and only permit applications to modify the data via this API The code could look like this: create or replace procedure schedule_resource ( p_resource_name in varchar2, p_start_time in date, p_end_time in date ) as l_resource_name resourcesresource_name%type; l_cnt number; begin We start by locking the single row in the RESOURCES table for the resource we want to schedule.

By default, Oracle Database 11g automatically tunes the undo retention period. Oracle recommends that you not set a value for the UNDO_RETENTION parameter unless your system has Flashback or LOB retention requirements.

With Oracle9i and above, there are two methods to manage undo in the system: Automatic undo management: Here, Oracle is told how long to retain undo for, via the UNDO_RETENTION parameter. Oracle will determine how many undo segments to create based on concurrent workload and how big each should be. The database can even reallocate extents between individual undo segments at runtime to meet the UNDO_RETENTION goal set by the DBA. This is the recommended approach for undo management. Manual undo management: Here, the DBA does the work. The DBA determines how many undo segments to manually create, based on the estimated or observed workload. The DBA determines how big the segments should be based on transaction volume (how much undo is generated) and the length of the longrunning queries.

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