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If we have a REPEATABLE READ isolation, the results from a given query must be consistent with respect to some point in time. Most databases (not Oracle) achieve repeatable reads via the use of row-level shared read locks. A shared read lock prevents other sessions from modifying data that we have read. This, of course, decreases concurrency. Oracle opted for the more concurrent, multi-versioning model to provide read-consistent answers. In Oracle, using multi-versioning, we get an answer that is consistent with respect to the point in time the query began execution. In other databases, using shared read locks, we get an answer that is consistent with respect to the point in time the query completes that is, when we can get the answer at all (more on this in a moment). In a system that employs a shared read lock to provide repeatable reads, we would observe rows in a table getting locked as the query processed them. So, using the earlier example, as our query reads the ACCOUNTS table, it would leave shared read locks on each row, as shown in Table 7-5. Table 7-5. Timeline 1 in Non-Oracle Database Using READ REPEATABLE Isolation

Oracle-supplied packages have the same kind of functionality as the packages that you can create in the database. They have the same specification and body structure, and can include several functions and procedures. The biggest advantages to using packages are the reusability of code, the ability to overload procedures and functions, and an efficient organization of stored program code. Oracle PL/SQL packages exploit all the standard benefits of the regular user-created packages.

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Many of the interaction patterns that occur between software processes are similar to those that occur in the hardware world. When deciding which type of pattern to use, you should first determine whether you need a push or pull interaction. This decision usually depends on who has control of the interaction the caller or the callee. The timing of the interaction (synchronous or asynchronous) is probably the second-most important decision. When creating asynchronous interactions, remember that it is usually better to handle the asynchrony on the caller side than the callee side.

The Oracle PL/SQL packages are automatically created in a new database when you run the script catproc.sql (from the $ORACLE_HOME/rdbms/admin directory) right after the creation of the database. You do need to create some special packages manually, but most of the packages are automatically created when you run the catproc.sql script (see 9). The user SYS owns all these packages, and a user with the DBA role has the privileges to execute any of them. If you sometimes can t execute a PL/SQL package, just add the SYS schema name before the package name (for example, SYS.DBMS_SYSTEM). If other database users need to use these packages, the DBA must grant the necessary SELECT or EXECUTE privileges on the individual packages.

Reads row 1. Sum = $500.00 so far. Block 1 has a shared read lock on it. Reads row 2. Sum = $740.25 so far. Block 2 has a shared read lock on it.

Almost all the Oracle-supplied PL/SQL packages consist of a set of procedures (and sometimes functions) that together provide the functionality for which the package is designed. At any given time, you re usually executing a procedure or a function that belongs to the PL/SQL package.

f you look at lots of different types of software systems, you soon realize that they have certain things in common On the surface, a financial-planning system might not seem to have anything in common with an elevator-control system; a washing-machine program might not seem to have anything in common with a data-decryption system However, if you step back a bit and look at the broader picture, similarities start to emerge For example, all software systems need an initialization process before they can perform their main task Many software systems have a shutdown process when they are terminated All useful software systems must implement some level of business logic The expression business logic is used in the broadest sense and includes the rules of whatever domain the software system is designed for For example, in a temperature-control system, the business rules relate to heating and cooling laws.

For example, the well-known PL/SQL package DBMS_OUTPUT has the procedure PUT_LINE, which you use to see the output of PL/SQL code on your screen In the following discussion of important Oracle packages, first you ll learn the key procedures that make up each package Later on, you ll see how to use the package to perform relevant tasks An easy way to list all the procedures and functions within an Oracle package is to simply use the familiar DESCRIBE command in SQL*Plus For each package, the DESCRIBE command shows the following columns: PROCEDURE/FUNCTION_NAME: This column indicates whether the component is a procedure or a function, and provides you with the component s name ARGUMENT_NAME: This column provides you with the name of each argument in a procedure or function TYPE: This column contains the argument type (Boolean, date, and so forth).

Attempts to update row 1 but is blocked. Transaction is suspended until it can obtain an exclusive lock. Reads row N. Sum = . . .

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