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As stated earlier, NLS stands for National Language Support. NLS is a very powerful feature of the database, but one that is often not as well understood as it should be. NLS controls many aspects of our data. For example, it controls how data is sorted, and whether we see commas and a single period in a number (e.g., 1,000,000.01) or many periods and a single comma (e.g., 1.000.000,01). But most important, it controls the following: Encoding of the textual data as stored persistently on disk Transparent conversion of data from character set to character set It is this transparent part that confuses people the most it is so transparent, you cannot even really see it happening. Let s look at a small example. Suppose you are storing 8-bit data in a WE8ISO8859P1 character set in your database, but you have some clients that connect using a 7-bit character set such as US7ASCII. These clients are not expecting 8-bit data and need to have the data from the database converted into something they can use. While this sounds wonderful, if you are not aware of it taking place, then you might well find that your data loses characters over time as the characters that are not available in US7ASCII are translated into some character that is. This is due to the character set translation taking place. In short, if you retrieve data from the database in character set 1, convert it to character set 2, and then insert it back (reversing the process), there is a very good chance that you have materially modified the data. Character set conversion is typically a process that will change the data, and you are usually mapping a large set of characters

Note To choose the best execution plans, Oracle uses statistics on tables and indexes, which include counts of the number of rows and the data distribution of data skew in the tables within the database. (The physical storage statistics and the data distribution statistics for all database tables and indexes, columns, and partitions are stored in various data dictionary tables.) Armed with this information, the optimizer usually succeeds in finding the best path to access the necessary data for executing a SQL statement. Oracle also lets you use hints to override the optimizer s choice of an execution path. This is because in some instances the application developer s knowledge of the data enables the use of more efficient execution plans than the optimizer can come up.

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You can also use the Oracle optimizer in an enhanced tuning mode, as shown in 19. The Oracle optimizer in the tuning mode is the basis of the SQL Tuning Advisor feature, also explained in 19.

They use exactly the same amount of space, down to the byte there are no differences there. However, the first index is a lot more compressible if we use index key compression, as evidenced by the OPT_CMP_PCTSAVE value. There is an argument for arranging the columns in the index in order from the least discriminating to the most discriminating. Now let s see how they perform, to determine if either index is generally more efficient than the other. To test this, we ll use a PL/SQL block with hinted queries (so as to use one index or the other): ops$tkyte@ORA11GR2> alter session set sql_trace=true; Session altered. ops$tkyte@ORA11GR2> declare 2 cnt int; 3 begin 4 for x in ( select /*+FULL(t)*/ owner, object_type, object_name from t ) 5 loop 6 select /*+ INDEX( t t_idx_1 ) */ count(*) into cnt 7 from t 8 where object_name = x.object_name 9 and object_type = x.object_type 10 and owner = x.owner; 11 12 select /*+ INDEX( t t_idx_2 ) */ count(*) into cnt 13 from t 14 where object_name = x.object_name 15 and object_type = x.object_type 16 and owner = x.owner; 17 end loop; 18 end; 19 / PL/SQL procedure successfully completed. These queries read every single row in the table by means of the index. The TKPROF report shows us the following: SELECT /*+ INDEX( t t_idx_1 ) */ COUNT(*) FROM T WHERE OBJECT_NAME = :B3 AND OBJECT_TYPE = :B2 AND OWNER = :B1 call count ------- -----Parse 1 Execute 48243 Fetch 48243 ------- -----total 96487 cpu elapsed disk query current -------- ---------- ---------- ---------- ---------0.00 0.00 0 0 0 10.63 10.78 0 0 0 1.90 1.77 0 145133 0 -------- ---------- ---------- ---------- ---------12.53 12.55 0 145133 0 rows ---------0 0 48243 ---------48243

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