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we can see we are much closer to the worked performed by the nonpartitioned table earlier that is, we have not negatively impacted the work performed by our queries. It should be noted, however, that a hash partitioned index cannot be range scanned; in general, it is most suitable for exact equality (equals or in-lists). If you were to query WHERE OWNER > :X using the preceding index, it would not be

Figure 3-14. Business objects subclassing BusinessListBase BusinessListBase supports the undo capabilities implemented for BusinessBase; the two base classes work hand in hand to provide this functionality. As shown in Figure 3-15, the two objects that list read-only data for the user inherit from ReadOnlyListBase. This base class provides the support objects need for retrieving data from the database without the overhead of supporting undo or business rule tracking. Those features aren t required for read-only objects. The ProjectInfo and ResourceInfo classes don t inherit from any CSLA .NET base classes. As you ll see in s 7 and 8, they must be marked with the <Serializable()> attribute, but they don t need to inherit from a special base class just to expose a set of read-only properties. Next, there s the RoleList object, which is a read-only list of name/value data. Although this could be implemented using ReadOnlyListBase, 6 will describe the NameValueListBase class, as shown in Figure 3-16. This class provides a better alternative for building name/value lists and is designed to make it as easy as possible to create read-only lists of text values, so it s ideal for building the RoleList class.

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able to perform a simple range scan using partition elimination. You would be back to inspecting all 16 hash partitions.

This example brought to mind an unrelated but very important fact. When looking at hash partitioned indexes, we are faced with another case where the use of an index to retrieve data would not automatically retrieve the data sorted. Many people assume that if the query plan shows an index is used to retrieve the data, the data will be retrieved sorted. This has never been true. The only way we can retrieve data in any sort of sorted order is to use ORDER BY clause on the query. If your query does not contain an ORDER BY statement, you cannot make any assumptions about the sorted order of the data. A quick example demonstrates this. We create a small table as a copy of ALL_USERS and create a hash partitioned index with four partitions on the USER_ID column:

Figure 3-16. RoleList subclassing NameValueListBase Finally, there are the two custom authentication objects: PTPrincipal and PTIdentity. Figure 3-17 shows these objects along with their CSLA .NET base classes.

ops$tkyte@ORA11GR2> create table t 2 as 3 select * 4 from all_users 5 / Table created. ops$tkyte@ORA11GR2> create index t_idx 2 on t(user_id) 3 global 4 partition by hash(user_id) 5 partitions 4 6 / Index created.

Now, we will query that table and use a hint to have Oracle use the index. Notice the ordering (actually, the lack of ordering) of the data:

Figure 3-17. Objects supporting custom authentication PTPrincipal inherits from Csla.Security.BusinessPrincipalBase, ensuring that it implements the System.Security.Principal.IPrincipal interface and also that it will work with the data portal, as implemented in 4. A required property from the IPrincipal interface is Identity, which

ops$tkyte@ORA11GR2> set autotrace on explain ops$tkyte@ORA11GR2> select /*+ index( t t_idx ) */ user_id 2 from t 3 where user_id > 0 4 / USER_ID ---------11 34 81 157 19 22 139 161 5

Transmit timestamp must not match the last one received from the same peer. Originate timestamp matches the last one sent to the same peer. Both originate and receive timestamps must be nonzero. Calculated delay must be within reasonable bounds. Authentication needs to be disabled, or the authenticator must be present and correct as determined by the decrypt procedure. The peer clock must be synchronized and the interval (since the peer clock was last updated) must be positive and less than an NTP parameter max clock age represented as NTP .MAXAGE. Host will not synchronize on a peer with a greater stratum. The NTP message header needs to contain reasonable values for the pkt.rootdelay and pkt.rootdispersion variables.

23 163 167 35 37 75 160 38 rows selected. Execution Plan ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=4 Card=38 Bytes=494) 1 0 PARTITION HASH (ALL) (Cost=4 Card=38 Bytes=494) 2 1 INDEX (RANGE SCAN) OF 'T_IDX' (INDEX) (Cost=4 Card=38 Bytes=494) ops$tkyte@ORA11GR2> set autotrace off

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