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Figure 9-5. An asynchronous interaction I use two vertical parallel bars (which aren t standard UML) to indicate which side the asynchronous (i.e., parallel) behavior is implemented on. The bars can appear on the caller side or the callee side or on both sides. In the simplest of cases, the caller may not need any feedback from the callee regarding execution progress of completion status. Calls made without the expectation of a completion response are a special case of asynchronous blind interactions known as fire-and-forget. Asynchronous interactions often require completion status from the callee. You can consider the returned status to be a form of feedback. As you shall see a bit later, interactions with completion feedback are a subset of transparent interactions, in which the caller can receive progress feedback from the callee while a command is being carried out.

The DBA_TAB_MODIFICATIONS view shows all DML changes in a table since statistics were last collected for that table. Here s a query on this view: SQL> SELECT table_name, inserts, updates, deletes FROM DBA_TAB_MODIFICATIONS; TABLE_NAME -------------------------WRH$ACTIVE_SESSION_HISTORY WRH$SERVICE_STAT WRH$SERVICE_WAIT_CLASS . . . SQL> INSERTS ------1233 5376 1050 UPDATES ------0 0 0 DELETES ------0 0 0

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Well, let s log in using shared server and in that session query: ops$tkyte@ORA10G> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = 'OPS$TKYTE' 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------- -------- ------ ---------------------OPS$TKYTE 150 261 SHARED AE4CF118 ACTIVE oracle@localhost(S000) Our shared server connection is associated with a process the PADDR is there and we can join to V$PROCESS to pick up the name of this process. In this case, we see it is a shared server, as identified by the text S000. However, if we use another SQL*Plus window to query this same bit of information, while leaving our shared server session idle, we see something like this: sys@ORA10G> 2 3 from 4 on 5 where 6 / select a.username, a.sid, a.serial#, a.server, a.paddr, a.status, b.program v$session a left join v$process b (a.paddr = b.addr) a.username = 'OPS$TKYTE'

Suppose you want to find out the average length of each row in a table or the default value of each column (if there is one). The DBA_TAB_COLUMNS view is an excellent way to quickly get detailed column-level information on schema tables, as shown in Listing 23-23. Listing 23-23. Using the DBA_TAB_COLUMNS View SQL> 2 3 4 5 6 7* SELECT column_name, avg_col_len, data_type, data_length, nullable, FROM dba_tab_columns WHERE owner='OE';

COLUMN_NAME AVG_COL_LEN DATA_TYPE DATA_LENGTH NULL -------------------------------------------------------------CUSTOMER_ID 4 NUMBER 22 N CUST_FIRST_NAME 7 VARCHAR2 20 N CUST_LAST_NAME 8 VARCHAR2 20 N TRANSLATED_DESCRIPTION 245 NVARCHAR2 4000 N PRODUCT_DESCRIPTION 123 VARCHAR2 2000 Y WARRANTY_PERIOD 5 INTERVAL YEA 5 Y SQL>

In the field of hardware control systems, feedback denotes any output signal that is routed back as an input. For example, given a system that provides analog signal amplification, feedback is a portion of the output signal that is taken and fed back into an input, as shown in Figure 9-6.

USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------ -------- -------- ----------------------OPS$TKYTE 150 261 NONE AE4CEC1C INACTIVE oracle@localhost(D000) Notice that our PADDR is different and the name of the process we are associated with has also changed Our idle shared server connection is now associated with a dispatcher, D000 Hence we have yet another method for observing multiple sessions pointing to a single process A dispatcher could have hundreds, or even thousands, of sessions pointing to it An interesting attribute of shared server connections is that the shared server process we use can change from call to call If I were the only one using this system (as I am for these tests), running that query over and over as OPS$TKYTE would tend to produce the same PADDR of AE4CF118 over and over.

As you know, views are the product of a query on some database table(s). The DBA_VIEWS dictionary view provides you with the SQL query that underlies the views. Listing 23-24 shows how to get the text of a view, OC_CUSTOMERS, owned by user oe.

To ensure you see the whole text of the view when you use the DBA_VIEWS view, set the long variable to a large number (for example, SET LONG 2000). Otherwise, you ll see only the first line of the view definition.

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