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That s not unlike the initial stage of the convergence of the Spanning Tree Protocol (STP) where every switch claims to be the root, Sam mused In the end, though, hierarchy prevails! he sighed with relief When Hera, the wife of Zeus; Athena, the warrior goddess of arts and crafts, learning, wisdom, and the intellect; and Aphrodite, the goddess of love and beauty, also claimed the Apple, all of the lesser goddesses stepped back from it But there can be only a single root bridge in any STP configuration, Sam kept reminding himself, as he viewed the trio of powerful goddesses reaching for the Apple! Although, he pondered, instead of STP they might be setting a pattern here for a distributed hierarchy , of stratum 1 NTP servers.

The key to understanding LINQ is to understand the role of expression trees in the implementation of LINQ. Expression trees are representations of source code as data. Consider the following code passed to the Where() method in LINQ: Dim result = someCollection.Where(Function(x) x.SomeVal = 42) The parameter provided to the Where() method is a lambda function a more compact syntax for an anonymous method. However, when Where() is invoked, the lambda function is converted into a data structure in the form of an expression tree that looks like Figure 14-3.

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9 from all_objects 10 / Table created. Now we can measure the space used. We ll use the ANALYZE INDEX VALIDATE STRUCTURE command for this. This command populates a dynamic performance view named INDEX_STATS, which will contain only one row at most with the information from the last execution of that ANALYZE command: ops$tkyte%ORA11GR2> analyze index iot_pk validate structure; Index analyzed. ops$tkyte%ORA11GR2> select lf_blks, br_blks, used_space, 2 opt_cmpr_count, opt_cmpr_pctsave 3 from index_stats; LF_BLKS BR_BLKS USED_SPACE OPT_CMPR_COUNT OPT_CMPR_PCTSAVE ---------- ---------- ---------- -------------- ---------------429 3 3081451 2 33 This shows our index is currently using 429 leaf blocks (where our data is) and 3 branch blocks (blocks Oracle uses to navigate the index structure) to find the leaf blocks. The space used is about 3MB (3,081,451 bytes). The other two oddly named columns are trying to tell us something. The OPT_CMPR_COUNT (optimum compression count) column is trying to say, If you made this index COMPRESS 2, you would achieve the best compression. The OPT_CMPR_PCTSAVE (optimum compression percentage saved) is telling us if we did the COMPRESS 2, we would save about one-third of the storage and the index would consume just two-thirds the disk space it is now.

To test that theory, we ll rebuild the IOT with COMPRESS 1 first: ops$tkyte%ORA11GR2> alter table iot move compress 1; Table altered. ops$tkyte%ORA11GR2> analyze index iot_pk validate structure; Index analyzed. ops$tkyte%ORA11GR2> select lf_blks, br_blks, used_space, 2 opt_cmpr_count, opt_cmpr_pctsave 3 from index_stats; LF_BLKS BR_BLKS USED_SPACE OPT_CMPR_COUNT OPT_CMPR_PCTSAVE ---------- ---------- ---------- -------------- ---------------372 3 2666971 2 22

Figure 14-3. A simple expression tree Expression trees allow for code to be executed by alternative means that is, the code can be translated to other forms, such as SQL. For example, in LINQ to SQL, the previous expression will get converted into the following SQL query: SELECT * FROM someCollection WHERE SomeVal = 42

As you can see, the index is in fact smaller: about 2.6MB, with far fewer leaf. But now it is saying, You can still get another 22% off, as we didn t chop off that much yet. Let s rebuild with COMPRESS 2: ops$tkyte%ORA11GR2> alter table iot move compress 2; Table altered. ops$tkyte%ORA11GR2> analyze index iot_pk validate structure; Index analyzed. ops$tkyte%ORA11GR2> select lf_blks, br_blks, used_space, 2 opt_cmpr_count, opt_cmpr_pctsave 3 from index_stats; LF_BLKS BR_BLKS USED_SPACE OPT_CMPR_COUNT OPT_CMPR_PCTSAVE ---------- ---------- ---------- -------------- ---------------286 3 2052864 2 0 Now we are significantly reduced in size, both by the number of leaf blocks as well as overall used space, by about 2MB. If we go back to the original numbers ops$tkyte%ORA11GR2> select (2/3)*3081451 from dual; (2/3)*3081451 ------------2054300.67 we can see the OPT_CMPR_PCTSAVE was pretty much dead-on accurate. The preceding example points out an interesting fact with IOTs. They are tables, but only in name. Their segment is truly an index segment. I am going to defer discussion of the PCTTHRESHOLD option at this point, as it is related to the next two options for IOTs: OVERFLOW and INCLUDING. If we look at the full SQL for the next two sets of tables, T2 and T3, we see the following (I ve used a DBMS_METADATA routine to suppress the storage clauses, as they are not relevant to the example): ops$tkyte%ORA11GR2> begin 2 dbms_metadata.set_transform_param 3 ( DBMS_METADATA.SESSION_TRANSFORM, 'STORAGE', false ); 4 end; 5 / PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> select dbms_metadata.get_ddl( 'TABLE', 'T2' ) from dual; DBMS_METADATA.GET_DDL('TABLE','T2') ------------------------------------------------------------------------------CREATE TABLE "OPS$TKYTE"."T2" ( "X" NUMBER(*,0), "Y" VARCHAR2(25), "Z" DATE, PRIMARY KEY ("X") ENABLE ) ORGANIZATION INDEX NOCOMPRESS PCTFREE 10 INITRANS 2 MAXTRANS 255 LOGGING TABLESPACE "USERS"

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