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Example 8 Two persons, A and B, are talking on the phone. Person A asks, What time is it Person B replies, 2:30 p.m. When asking the question, person A expects a response to be returned very quickly. Because the interaction is expected to be brief, he puts his other activities and thoughts on hold momentarily until the response is returned. Person B also knows the request will only take a few seconds to handle, and also decides to put everything else on hold while looking at his watch. The interaction is therefore synchronous. Person A can t watch person B as the latter determines the time because person A has no idea exactly what is going on at the other end of the line. The interaction is therefore blind. Example 9 A navigation system in an avionics package uses a Global Positioning System (GPS) receiver to get the current position. The GPS receiver always maintains the current position internally, so it can honor requests almost immediately at all times. The navigation system uses a synchronous blind interaction to interrogate the receiver for the current position. Assume the specifications for the GPS receiver indicate that data is generally returned in less than 50 microseconds. A synchronous blind

Note The true disconnect in SQL*Plus is exit, as you would have to exit to completely destroy the

Listing 23-21. Using the INDEX_STATS View to Determine Whether to Rebuild an Index SQL> 2 3 4 5 6 7 SELECT height, blocks, name, lf_rows, lf_blks, del_lf_rows, rows_per_key /*Height of the B-Tree*/ /* Blocks in the index segment */ /*index name */ /* number of leaf rows in the index */ /* number of leaf blocks in the index */ /* number of deleted leaf rows in the index */ /* average number of rows per distinct key */ /* consistent mode block reads (gets) */

8 blk_gets_per_access 8 FROM INDEX_STATS 9* WHERE name='EMP_NAME_IX';

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We have, however, closed all of our sessions. If we open another session using some other user account and query (replacing OPS$TKYTE with your account name, of course), sys@ORA10G> select * from v$session where username = 'OPS$TKYTE'; no rows selected we can see that we have no sessions but we still have a process, a physical connection (using the previous ADDR value): sys@ORA10G> select username, program 2 from v$process 3 where addr = hextoraw('AE4CF614'); USERNAME PROGRAM --------------- -----------------------------------------------tkyte oracle@localhost.localdomain (TNS V1-V3) So, here we have a connection with no sessions associated with it. We can use the also misnamed SQL*Plus CONNECT command to create a new session in this existing process (the CONNECT command might be better named CREATE_SESSION): ops$tkyte@ORA10G> connect / Connected. ops$tkyte@ORA10G> select username, sid, serial#, server, paddr, status 2 from v$session

transaction works well here, because the current position is obtained quickly and with little strain on the GPS receiver, allowing the navigation system to decide when and how often to request new data. While the receiver is fetching the data to return, the navigation system has no idea how much time the response will actually take, although it has expectations derived from the receiver s spec sheet. If the GPS receiver loses contact with a satellite and needs to resynchronize, there may occasionally be a delay before a response can be returned.

HEIGHT BLOCK LF_ROWS LF_BLKS DEL_LF_ROWS ROWS_PER_KEY BLK_GETS ---------- ---------- -------------------- ---------- ---------16 EMP_NAME_IX 107 1 0 1 1 SQL>

In this section, you ll look at the important data dictionary views that help you manage nondata objects (that is, objects other than tables and indexes). The following is a list of the important data dictionary views for looking up various database objects: DBA_SYNONYMS: Information about database synonyms DBA_TRIGGERS: Information about triggers DBA_SEQUENCES: Information about user-created sequences DBA_DB_LINKS: Information about database links As mentioned earlier, the DBA_OBJECTS view provides important information on the preceding objects, as well as several other types of database objects. However, the preceding views provide detailed information about the object, such as the source text of a trigger, which you won t get from the DBA_OBJECTS view. You manage objects such as tables and views by referring to the data dictionary views, such as DBA_TABLES and DBA_VIEWS. There are also separate views for partitioned tables. Let s look at the key table- and index-related dictionary views.

where username = USER /

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