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The permutations here are vast. The ways in which combinations of calls to BeginEdit(), Add(), Remove(), CancelEdit(), and ApplyEdit() can be called are probably infinite. Let s look at some relatively common scenarios, though, to get a good understanding of what happens as child objects are deleted and undeleted. First, consider a case in which the collection has been loaded with data from a database and the database includes one child object: A. Then, the UI calls BeginEdit() on the collection and adds a new object to the collection: B. Figure 13-2 shows what happens if these two objects are removed and then CancelEdit() is called on the collection object.

Table altered. ops$tkyte%ORA11GR2> exec dbms_stats.gather_table_stats( user, 'BIG' ); PL/SQL procedure successfully completed.

Note You might wonder why I didn t use CASCADE=>TRUE on the gather-statistics call to gather statistics on the

In Figure 13-2, EL is the value of _editLevel in the collection, ELA is the _editLevelAdded value in each child object, and DEL is the IsDeleted value in each child object.

index created by default by the primary key constraint. That is because since Oracle 10g, a CREATE INDEX or ALTER INDEX REBUILD has implicit compute statistics added to it already whenever the table it is indexing is not empty. So, the very act of creating the index has the side effect of gathering statistics on itself. There s no need to re-gather the statistics we already have.

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The previous table will have lots of blocks as we get about six or seven rows per block using that big data field, and my ALL_OBJECTS table has over 70,000 rows Next, we ll create the small table the many little transactions will modify: ops$tkyte%ORA11GR2> create table small ( x int, y char(500) ); Table created ops$tkyte%ORA11GR2> insert into small select rownum, 'x' from all_users; 44 rows created ops$tkyte%ORA11GR2> commit; Commit complete ops$tkyte%ORA11GR2> exec dbms_statsgather_table_stats( user, 'SMALL' ); PL/SQL procedure successfully completed Now, we ll dirty up that big table We have a very small undo tablespace, so we ll want to update as many blocks of this big table as possible, all while generating the least amount of undo possible We ll use a fancy UPDATE statement to do that Basically, the following subquery is finding the first rowid of a row on every block.

Figure 13-2. Edit process in which objects are removed and CancelEdit is called After both objects are removed from the collection, they re marked for deletion and moved to the DeletedList collection. This way they appear to be gone from the collection, but the collection still has access to them if needed. After the CancelEdit() call, the collection s edit level goes back to 0. Since child A came from the database, it was added at edit level 0, so it sticks around. Child B on the other hand was added at edit level 1, so it goes away. Also, child A has its state reset as part of the CancelEdit() call (remember that CancelEdit() causes a cascade effect, so each child object restores its snapshot values). The result is that because of the undo operation, child A is no longer marked for deletion. Another common scenario follows the same process but with a call to ApplyEdit() at the end, as shown in Figure 13-3.

That subquery will return a rowid for every database block identifying a single row on it We ll update that row, setting a VARCHAR2(1) field This will let us update all of the blocks in the table (some 8,000 plus in the example), flooding the buffer cache with dirty blocks that will have to be written out (we have room for only 500 right now) We ll make sure we are using that small undo tablespace as well To accomplish this and not exceed the capacity of our undo tablespace, we ll craft an UPDATE statement that will update just the first row on each block.

Even such is time that takes in trust Our youth, our joys, our all we have, And pays us but with age and dust, Who in the dark and silent grave, When we have wondered all our ways, Shuts up the story of our days. But from this earth, this grave, this dust, My God shall raise me up, I trust.

The ROW_NUMBER() built-in analytic function is instrumental in this operation; it assigns the number 1 to the first row by database block in the table, which would be the single row on the block we would update: ops$tkyte%ORA11GR2> alter system set undo_tablespace = undo_small; System altered ops$tkyte%ORA11GR2> update big 2 set temporary = temporary 3 where rowid in 4 ( 5 select r.

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