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benchmark@ORA10G> create table components_nt 2 ( 3 component_id number primary key, 4 component_name varchar2(50), 5 parts part_type_tab 6 ) 7 nested table parts store as parts_nt; Table created. Attempting to create a foreign key constraint on the nested table does not work because nested tables do not allow referential integrity constraints, as shown in the following code. We will address this issue shortly. benchmark@ORA10G> alter table parts_nt add constraint parts_nt_fk foreign key(component_id) 2 references components_nt(component_id); alter table parts_nt add constraint parts_nt_fk foreign key(component_id) * ERROR at line 1: ORA-30730: referential constraint not allowed on nested table column

SQL Trace is an Oracle utility that helps you trace the execution of SQL statements. TKPROF is another Oracle utility that helps you format the trace files output by SQL Trace into a readable form. Although the EXPLAIN PLAN facility gives you the expected execution plan, the SQL Trace tool gives you the actual execution results of a SQL query. Sometimes, you may not be able to identify the exact code, say, for dynamically generated SQL. SQL Trace files can capture the SQL for dynamic SQL. Among other things, SQL Trace enables you to track the following variables:

CPU and elapsed times Parsed and executed counts for each SQL statement Number of physical and logical reads Execution plan for all the SQL statements Library cache hit ratios

If your application has a lot of dynamically generated SQL, the SQL Trace utility is ideal for tuning the SQL statements.

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Performing DML on a Table Containing a Column of the Nested Table Type Let s now look at how to carry out DML operations on a table containing a nested table column. We can insert a row in the table components_nt as follows: benchmark@ORA10G> insert into components_nt values 2 ( 1, 'component 1', 3 part_type_tab( (part_type(1,1, 'part1', 'part1 description')), 4 (part_type(1,2, 'part2', 'part2 description') ) 5 ) 6 ); 1 row created. The syntax should be familiar to you by now: It uses nested table constructors, which we have already covered. The following example runs a simple select on table components_nt: benchmark@ORA10G> select * from components_nt; COMPONENT_ID COMPONENT_NAME PARTS(COMPONENT_ID, PART_ID, PART_NAME, PART_DESC) ------------ ---------------------------------------------1 component 1 PART_TYPE_TAB(PART_TYPE(1, 1, 'part1', 'part1 description'), PART_TYPE(1, 2, 'part2', 'part2 description'))

Although the EXPLAIN PLAN tool is important for determining the access path that the optimizer will use, SQL Trace gives you a lot of hard information on resource use and the efficacy of the statements. You ll get a good idea of whether your statement is being parsed excessively. The statement s execute and fetch counts illustrate its efficiency. You get a good sense of how much CPU time is consumed by your queries and how much I/O is being performed during the execution phase. This helps you identify the resource-guzzling SQL statements in your application and tune them. The EXPLAIN PLAN, which is an optional part of SQL Trace, gives the row counts for the individual steps of the EXPLAIN PLAN, helping you pinpoint at what step the most work is being done. By comparing resource use with the number of rows fetched, you can easily determine how productive a particular statement is. In the next sections you ll use SQL Trace to trace a simple SQL statement and interpret it with the TKPROF utility. You start by setting a few initialization parameters to ensure tracing.

Before you can connect to a SQL*Plus session, you first need to set up the environment correctly so you can connect to the default database on a server. You can do this by using the environmental variable ORACLE_SID. Here s an example: $ ORACLE_SID=orcl $ export ORACLE_SID Once you set up the default database (orcl in our case) using the ORACLE_SID environmental variable, you can access SQL*Plus from the command-line prompt by typing sqlplus without providing either the username or the password. SQL*Plus will then prompt you for your username and password. If you provide the username with the command (for example, sqlplus salapati), SQL*Plus will prompt you for the password. As a DBA, you should log in with one of your administrative accounts.

If we want to unnest the nested table contents, we can run the following select using the table construct to join the nested table with its parent table (very similar to the case of varrays): benchmark@ORA10G> select p.* 2 from components_nt c, TABLE( c.parts ) p; COMPONENT_ID PART_ID PART_NA ------------ ---------- ------1 1 part1 1 2 part2 PART_DESC -------------------part1 description part2 description

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