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6 from ( 7 select rowid r, row_number() over 8 (partition by dbms_rowid.rowid_block_number(rowid) order by rowid) rn 9 from big 10 ) 11 where rn = 1 12 ) 13 / 12014 rows updated. ops$tkyte%ORA11GR2> commit; Commit complete. OK, so now we know that we have lots of dirty blocks on disk. We definitely wrote some of them out, because we just didn t have the room to hold them all. Next, we opened a cursor, but we haven t yet fetched a single row. Remember, when we open the cursor, the resultset is preordained, so even though Oracle did not actually process a row of data, the act of opening that resultset fixed the point in time the results must be as of. Now since we ll be fetching the data we just updated and committed, and we know no one else is modifying the data, we should be able to retrieve the rows without needing any undo at all. But that s where the delayed block cleanout rears its head. The transaction that modified these blocks is so new that Oracle will be obliged to verify that it committed before we begin, and if we overwrite that information (also stored in the undo tablespace), the query will fail. So, here is the opening of the cursor: ops$tkyte%ORA11GR2> variable x refcursor ops$tkyte%ORA11GR2> exec open :x for select * from big where object_id < 100; PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> !./run.sh run.sh is a shell script; it simply fired off nine SQL*Plus sessions using a command: $ORACLE_HOME/bin/sqlplus / @test2 1 $ORACLE_HOME/bin/sqlplus / @test2 2 (3-8 would go here ) $ORACLE_HOME/bin/sqlplus / @test2 9 & & &

Figure 13-3. Edit process in which objects are removed and ApplyEdit is called The first two steps are identical, of course, but after the call to ApplyEdit(), things are quite different. Since changes to the collection are accepted rather than rejected, the changes become permanent. Child A remains marked for deletion, and if the collection is saved back to the database, the data for child A is deleted from the database. Child B is totally gone at this point. It is a new object added and deleted at edit level 1, and all changes made at edit level 1 are accepted. Since the collection knows that B was never in the database (because it was added at edit level 1), it can simply discard the object entirely from memory. Let s look at one last scenario. Just to illustrate how rough this gets, this will be more complex. It involves nested BeginEdit(), CancelEdit(), and ApplyEdit() calls on the collection. This can easily happen if the collection contains child or grandchild objects and they are displayed in a Windows Forms UI that uses modal dialog boxes to edit each level (parent, child, grandchild, and so on). Again, child A is loaded from the database and child B is added at edit level 1. Finally, C is added at edit level 2. Then all three child objects are removed, as shown in Figure 13-4. Suppose ApplyEdit() is now called on the collection. This applies all edits made at edit level 2, putting the collection back to edit level 1. Since child C was added at edit level 2, it simply goes away, but child B sticks around because it was added at edit level 1, which is illustrated in Figure 13-5.

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where each SQL*Plus session was passed a different number (that was number 1; there was a 2, 3, and so on). The script test2.sql they each ran is as follows: begin for i in 1 .. 5000 loop update small set y = i where x= &1; commit; end loop; end; / exit

execute immediate 'select ts.segment_space_management from dba_segments seg, dba_tablespaces ts where seg.segment_name = :p_segname and (:p_partition is null or seg.partition_name = :p_partition) and seg.owner = :p_owner and seg.tablespace_name = ts.tablespace_name' into l_segment_space_mgmt using p_segname, p_partition, p_partition, p_owner; exception when too_many_rows then dbms_output.put_line ( 'This must be a partitioned table, use p_partition => '); return; end; -- if the object is in an ASSM tablespace, we must use this API -- call to get space information, else we use the FREE_BLOCKS -- API for the user managed segments if l_segment_space_mgmt = 'AUTO' then dbms_space.space_usage ( p_owner, p_segname, p_type, l_unformatted_blocks, l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes, l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes, l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition); p( 'Unformatted Blocks ', l_unformatted_blocks ); p( 'FS1 Blocks (0-25) ', l_fs1_blocks ); p( 'FS2 Blocks (25-50) ', l_fs2_blocks ); p( 'FS3 Blocks (50-75) ', l_fs3_blocks ); p( 'FS4 Blocks (75-100)', l_fs4_blocks ); p( 'Full Blocks ', l_full_blocks ); else dbms_space.free_blocks( segment_owner => p_owner, segment_name => p_segname, segment_type => p_type, freelist_group_id => 0, free_blks => l_free_blks); p( 'Free Blocks', l_free_blks ); end if; -- and then the unused space API call to get the rest of the -- information dbms_space.unused_space ( segment_owner => p_owner, segment_name => p_segname, segment_type => p_type, partition_name => p_partition, total_blocks => l_total_blocks,

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