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A Solution for Foreign Key References: CREATE SCHEMA
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While we are on the topic of creating multiple tables, Oracle SQL also supports the ANSI/ISO standard CREATE SCHEMA command. This command allows you to create a complete schema (consisting of tables, views, and grants) with a single DDL command/transaction. One advantage of the CREATE SCHEMA command is that it succeeds or fails as an atomic transaction. It also solves the problem of two tables having foreign key references to each other (see Listings 7-5, 7-6, and 7-7), where you normally need at least one ALTER TABLE command, because foreign keys can reference only existing tables. Listing 7-13 shows how you could have created the case tables with the CREATE SCHEMA command.
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CHAPTER 7 DATA DEFINITION, PART II
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Listing 7-13. The CREATE SCHEMA Command SQL> create schema authorization BOOK 2 create table employees (...) 3 create table departments (...) 4 create table salgrades (...) 5 create table courses (...) 6 create table offerings (...) 7 create table registrations (...) 8 create table history (...) 9 create view ... as select ... from ... 10 grant select on ... to public;
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Note The name of this command (as implemented by Oracle) is confusing, because it does not actually
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create a schema. Oracle schemas are created with the CREATE USER command. The command succeeds only if the schema name is the same as your Oracle database username.
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You can specify the CREATE SCHEMA command components in any order. Within each component definition, you can refer to other (earlier or later) schema components.
Deferrable Constraints
The Oracle DBMS also supports deferrable constraints, allowing you to specify when you want the constraints to be checked. These are the two possibilities: IMMEDIATE checks at the statement level. DEFERRED checks at the end of the transaction. Before you can use this distinction, you must first allow a constraint to be deferrable. The default option for all constraints that you create is NOT DEFERRABLE. If you want your constraints to be deferrable, add the DEFERRABLE option in the constraint definition, as shown in Figure 7-9, just before the storage clause specification (see Figures 7-6 and 7-8).
Figure 7-9. DEFERRABLE option for constraint definitions
CHAPTER 7 DATA DEFINITION, PART II
If you allow constraints to be deferrable using the DEFERRABLE option, they still have a default behavior of INITIALLY IMMEDIATE. The INITIALLY option allows you to specify the desired default constraint checking behavior, using IMMEDIATE or DEFERRED. You can dynamically change or override the default behavior of deferrable constraints at the transaction level with the SET CONSTRAINTS command, as shown in Figure 7-10.
Figure 7-10. SET CONSTRAINTS command syntax diagram At first sight, the complexity of all this constraint-checking syntax may look overwhelming. The following summary may help clarify how it works: By default, the Oracle DBMS always uses immediate constraint checking. You must explicitly allow a constraint to be deferrable. By default, constraints are not deferrable. If constraints are deferrable, you can choose how they should be checked by default: immediate or deferred. If constraints are deferrable, you can influence their behavior with the SET CONSTRAINTS command.
7.5 Indexes
In general, rows within a regular table are unordered. Although the Oracle DBMS offers many different ways to physically organize tables on disk (heap tables, index clusters, hash clusters, index-organized tables, and sorted hash clusters), you should never expect the rows to be physically stored in a certain order. Even if a particular order exists today, there is no guarantee that it will be the same tomorrow. This is a fundamental property of relational databases (see Ted Codd s rule 8 in 1 about physical data independence). Suppose the EMPLOYEES table contains 50,000 rows (instead of the 14 rows we have), and suppose you want to know which employees have a name starting with a Q. Normally, the Oracle DBMS can use only one method to produce the results for this query: by accessing all 50,000 rows (with a full table scan) and checking the name for each of those rows. This could take quite some time, and perhaps there would be no employees at all with such a name. An index on employee names would be very useful in this situation. When you create an index, the Oracle DBMS creates, and starts to maintain, a separate database object containing a sorted list of column values (or column combination values) with row identifiers referring to
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