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Sometimes during certain maintenance operations and during recovery times, you can t have the database open for public access. That s when this partial opening of the database is necessary. You also use the NOMOUNT startup option during database creation and when you have to re-create control files.

They could both run the query to look for a reservation, even if the other session had already started to modify the SCHEDULES table (the change wouldn t be visible to the other session until commit, by which time it was too late) Since they were never attempting to modify the same row in the SCHEDULES table, they would never block each other and, thus, the business rule could not enforce what it was intended to enforce..

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That shows that in this particular case, the full scan is very appropriate due to the way the data is physically stored on disk. This begs the question, Why didn t the optimizer full scan in the first place for this query Well, it would have if left to its own design, but in the first example query against DISORGANIZED I purposely hinted the query and told the optimizer to construct a plan that used the index. In the second case, I let the optimizer pick the best overall plan.

The next step in the startup process, after the instance is started, is the mounting of the database. During the mount stage, Oracle associates the instance with the database. Oracle opens and reads the control files and gets the names and locations of the datafiles and the redo log files. You can mount an already started instance with the ALTER DATABASE command, or you can use the STARTUP MOUNT command when you initially start the database. If you ve already started the database in the nomount mode, use this command: SQL> ALTER DATABASE MOUNT; Database altered. SQL> To start up in the mount mode directly, use this command: SQL> STARTUP MOUNT ORACLE instance started. Total System Global Area Fixed Size Variable Size Database Buffers Redo Buffers Database mounted. SQL>

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The developer needed a method of enforcing the business rule in a multiuser environment a way to ensure that exactly one person at a time made a reservation on a given resource In this case, the solution was to impose a little serialization of his own In addition to performing the preceding count(*),the developer first performed the following: select * from resources where resource_name = :resource_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 querying 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 must wait until the transaction commits, at which point they would be able to see the schedule The chance of overlapping schedules is removed.

Reads row 2; sum = $750 so far. Reads row 3; sum = $1,150 so far. Updates row 4; puts an exclusive lock on row 4, preventing other updates (but not reads). Row 4 now has $500. Reads row 4; discovers that row 4 has been modified. It will actually roll back the block to make it appear as it did at time = T1. The query will read the value $100 from this block. Presents $1,250 as the answer.

You usually need to start up a database in mount mode when you re doing activities such as performing a full database recovery, changing the archive logging mode of the database, or

Developers must understand that, in a 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 Using the FOR UPDATE approach is still highly concurrent as there are potentially thousands of resources to be reserved What we have done is ensure that only one person modifies a resource at any time This is a rare case where the manual locking of data we are not going to actually update is called for You need to be able to recognize where you must manually lock and, perhaps as importantly, when not to (I ll get to an example of this in a bit).

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