A Comparison of Database Software CS 616 April 8, 2004 Team 7 Mandar Patankar Jonathan Cohen B. Timothy Walsh

Today’s Presentation Review and compare features of three ‘robust’ database engines:Review and compare features of three ‘robust’ database engines: SQL Server 2000 Oracle 9i MySQL 4.1

Hardware Requirements SQL Server MySQLOracle Processor Pentium 166 Mz or higher Less power needed Pentium 166 Mz or higher Memory (RAM) 64 MB 32 MB 128 MB Disk Space 270 MB 60 MB 128 MB (system drive) 4.5 GB Oracle Home Drive

SQL Implementation SQL Server MySQLOracle Name Transact –SQL MySQL Dialect PL/SQL Views General Views, Indexed Views, Distributed Partitioned Views Not Supported DBMS_ XMLSCHEMA Package Catalog views Views are mostly useful for letting users access a set of relations as one table (in read-only mode). Many SQL databases don't allow one to update any rows in a view, but you have to do the updates in the separate tables. MySQL doesn't yet support views, but they plan to implement these to about 5.0 (development has been delayed, it was planned for 4.1)

SQL Implementation SQL Server MySQLOracle Triggers AFTER triggers, INSTEAD OF triggers Not Supported BEFORE triggers, AFTER triggers, INSTEAD OF triggers A trigger is a special kind of stored procedure that runs when you modify data in a specified table using one or more of the data modification operations: UPDATE, INSERT, or DELETE. Special triggers known as INSTEAD OF triggers can specify modifications to a view's underlying base tables. Triggers can query other tables and can include complex SQL statements. They are primarily useful for enforcing complex business rules or requirements. For example, you can control whether to allow a new order to be inserted based on a customer's current account status.

SQL Implementation SQL Server MySQLOracle Stored Procedures T-SQL statements Not Supported PL/SQL statements, Java methods, third-generation language (3GL) routines Stored procedures and user-defined functions are collections of SQL statements and optional control-of-flow statements stored under a name and processed by the database server as a unit. Both stored procedures and user-defined functions are precompiled and ready for later use. Using Visual Database Tools, you can easily create, view, modify, and test stored procedures and user-defined functions.

SQL Implementation SQL Server MySQLOracle User-defined functions Scalar functions, Inline table- valued functions, Multistatement table-valued functions C, C++ external libraries Support for object-oriented programming

SQL Implementation SQL Server MySQLOracle Foreign Keys Supported Supported only for InnoDB tables Supporte The foreign key is a field reference into another table. The foreign key points back to the primary key of another table. Foreign keys prevent dependent tables from adding which might jeopardize the integrity of the data

SQL Implementation SQL Server MySQLOracle CursorsSupported Not Supported Supported Arrays Not supported SupportedSupported Indexes B-Tree indexes B-tree indexes B-Tree indexes, Bitmap indexes, Partitioned indexes, Function-based indexes, Domain indexes

Table Implementation SQL Server MySQLOracle Tables Relational tables, Temporary tables Transaction-safe tables (InnoDB); non-transaction- safe tables (ISAM) Relational tables, Object tables, Temporary tables

Cost OracleOracle $4,000 per processor $4,000 per processor + $150 per user (minimum 5 users) + $150 per user (minimum 5 users) MS SQLServerMS SQLServer $5,000 per procesor

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