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To ensure that the collection can properly undelete objects in case of an undo operation, it needs to keep a list of the objects that have been removed. The first step in accomplishing this goal is to maintain an internal list of deleted objects. Along with implementing this list, there needs to be a ContainsDeleted() method so that the business or UI logic can find out whether the collection contains a specific deleted object. BindingList already includes a Contains() method so that the UI code can ask the collection whether it contains a specific item. Since a BusinessListBase collection is unusual in that it contains two lists of objects, it s appropriate to allow client code to ask whether an object is contained in the deleted list as well as in the nondeleted list. The list of deleted objects is kept as a List(Of C) a strongly typed collection of child objects. That list is then exposed through a Protected property so it is available to subclasses. Subclasses have access to the nondeleted items in the collection, so this just follows the same scoping model. The list object is created on demand to minimize overhead in the case that no items are ever removed from the collection. Given the list for storing deleted child objects, it is possible to implement the methods to delete and undelete objects as needed. Deleting a child object is really a matter of marking the object as deleted and moving it from the active list of child objects to DeletedList. Undeleting occurs when a child object has restored its state so that it s no longer marked as deleted. In that case, the child object must be moved from DeletedList back to the list of active objects in the collection.

When our query gets to the block that was modified and committed before it began, it is in trouble. Normally, it would go to the undo segment pointed to by the block and find the status of the transaction that modified it (in other words, it would find the COMMIT SCN of that transaction). If the COMMIT SCN is less than t1, our query can use this block. If the COMMIT SCN is greater than t1, our query must roll back that block. The problem is, however, that our query is unable to determine in this particular case if the COMMIT SCN of the block is greater than or less than t1. It is unsure as to whether it can use that block image or not. The ORA-01555 error then results. To see this, we will create many blocks in a table that need to be cleaned out. We will then open a cursor on that table and allow many small transactions to take place against some other table not the table we just updated and opened the cursor on. Finally, we will attempt to fetch the data for the cursor. Now, we know that the data required by the cursor will be OK we should be able to see all of it since the modifications to the table would have taken place and been committed before we open the cursor. When we get an ORA-01555 error this time, it will be because of the previously described problem. To set up for this example, we ll use The 4MB UNDO_SMALL undo tablespace. A 16MB buffer cache, which is enough to hold about 2,000 blocks. This is so we can get some dirty blocks flushed to disk to observe this phenomenon.

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Nowhere in human endeavors is the personal license in describing or referencing time more pronounced than in literature. Sam was reluctant, at first, to scan for the literary meaning of time. After all, the nature of NTP seemed more related to their scientific concept of time. But he knew their science was ultimately a dead-end street and a box. And whereas poetic and literary descriptions of time might not have the respectability of their scientific counterparts among them, Sam was deeply aware that in many instances their poets actually understood the nature of time better than their scientists. The scientists have something to learn from the poets, he mused. He executed a scan. The results were overwhelming. He became absorbed in the poetic feeling of time.

Before we start, we ll create the undo tablespace and the big table we ll be querying: ops$tkyte%ORA11GR2> create undo tablespace undo_small 2 datafile '/tmp/undo.dbf' size 4m 3 autoextend off 4 / Tablespace created. ops$tkyte%ORA11GR2> create table big 2 as 3 select a.*, rpad('*',1000,'*') data 4 from all_objects a; Table created. ops$tkyte%ORA11GR2> alter table big add constraint big_pk 2 primary key(object_id);

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