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A process P1 wishes to send a command to a process P2, and P1 must wait until P2 has finished with the command before proceeding. P2 is trusted to return control within a timeframe that is acceptable to P1. P1 can t continue until P2 is finished processing the command. If P1 knows that P2 will finish quickly, or if P1 has a good estimate of how long execution will take, then progress updates may not be required.

Note that if you want to see the particular referential constraints and the delete rule, you have to use a slight variation on the preceding query: SQL> SELECT constraint_name, constraint_type, R_constraint_name, delete_rule FROM dba_constraints WHERE table_name='ORDERS'; CONSTRAINT_NAME TYPE -------------------- ---ORDER_DATE_NN C ORDER_CUSTOMER_ID_NN C ORDER_MODE_LOV C ORDER_TOTAL_MIN C ORDER_PK P ORDERS_SALES_REP_FK R ORDERS_CUSTOMER_ID_FK R 7 rows selected. SQL> R_CONSTRAINT_NAME -----------------DELETE_RULE ------------

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Statistics ---------------------------------------------------------0 recursive calls 0 db block gets 0 consistent gets 0 physical reads 0 redo size 756 bytes sent via SQL*Net to client 508 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 2 rows processed ops$tkyte@ORA10G> set autotrace off In doing so, we now have two sessions, but both are using the same single dedicated server process, as evidenced by them both having the same PADDR value We can confirm in the operating system that no new processes were created and that we are using a single process a single connection for both sessions Note that one of the sessions (the original session) is ACTIVE That makes sense: it is running the query to show this information, so of course it is active But that INACTIVE session what is that one for That is the AUTOTRACE session.

The DBA_CONS_COLUMNS view provides the column name and position in the table on which a constraint is defined. Here s the view: SQL> DESC DBA_CONS_COLUMNS Name ---------------OWNER CONSTRAINT_NAME TABLE_NAME COLUMN_NAME POSITION SQL>

Its job is to watch our real session and report on what it does When we enable AUTOTRACE in SQL*Plus, SQL*Plus will perform the following actions when we execute DML operations (INSERT, UPDATE, DELETE, SELECT, and MERGE): 1 It will create a new session using the current connection, if the secondary session does not already exist 2 It will ask this new session to query the V$SESSTAT view to remember the initial statistics values for the session in which we will run the DML This is very similar to the function the watch_statsql script performed for us in 4 3 It will run the DML operation in the original session 4 Upon completion of that DML statement, SQL*Plus will request the other session to query V$SESSTAT again and produce the report displayed previously showing the difference in the statistics for the session that executed the DML.

You can use the DBA_INDEXES dictionary view to find out just about everything you need to know about the indexes in your database, including the index name, index type, and the table and tablespace an index belongs to. Certain columns, such as BLEVEL (tells you the level of the B-tree index) and DISTINCT_KEYS (number of distinct index key values), are populated only if you ve collected statistics for the index using the DBMS_STATS package.

Synchronous blind interactions are the simplest interaction to implement and indeed the most common type used in software systems. They are typically accomplished using a simple method call. The caller makes a call to a function contained in the callee, and the caller blocks until the callee finishes. The call executes on the caller s thread and the callee returns control to the caller only when the command has been completely executed. If the command cannot be completed due to errors, the premature completion will still be regarded as a completion. When errors are expected, the interaction should arrange a way for the callee to notify the caller, perhaps by returning an error status code or throwing an exception. Figure 9-4 depicts a blind synchronous interaction.

The DBA_IND_COLUMNS view is similar to the DBA_CONS_COLUMNS view in structure, and it provides information on all the indexed columns in every table. This is important during SQL performance tuning when you notice that the query is using an index, but you aren t sure exactly on which columns the index is defined. The query in Listing 23-20 may reveal that the table has indexes on the wrong columns after all.

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