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different rows, or if the transaction workload is dominated by READ operations rather than UPDATEs), then the added overhead of the versioning scheme will be more than offset by a significant boost in the amount of parallel work that can be performed. If the assumption proves inaccurate (i.e., if concurrently executing transactions tend to access and update the same rows), then the overhead of the versioning technique will tend to become very high, swamping the concurrency gains.
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This chapter described the transaction mechanism provided by the SQL language: I A transaction is a logical unit of work in a SQL-based database. It consists of a sequence of SQL statements that are effectively executed as a single unit by the DBMS. I The COMMIT statement signals successful completion of a transaction, making all of its database modifications permanent. I The ROLLBACK statement asks the DBMS to abort a transaction, backing out all of its database modifications. I Transactions are the key to recovering a database after a system failure; only transactions that were committed at the time of failure remain in the recovered database. I Transactions are the key to concurrent access in a multiuser database. A user or program is guaranteed that its transaction will not be interfered with by other concurrent transactions. I Occasionally, a conflict with another concurrently executing transaction may cause the DBMS to roll back a transaction through no fault of its own. An application program that uses SQL must be prepared to deal with this situation if it occurs. I The subtleties of transaction management, and their impact on DBMS performance, are one of the more complex areas of using and operating a large production database. This is also an area where major DBMS brands diverge in their capabilities and tuning options. I Many DBMS brands use locking techniques to handle concurrent transactions. For these products, adjustments to the locking parameters and explicit locking statements allow you to tune transaction-processing performance. I An alternative versioning technique for handling concurrent transactions is gaining in popularity. For DBMS products that use versioning, adjustments to the depth of the versioning scheme and to the transaction mix itself are the keys to performance tuning.
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An important role of SQL is to define the structure and organization of a database. s 13 16 describe the SQL features that support this role. 13 describes how to create a database and its tables. 14 describes views, an important SQL feature that lets users see alternate organizations of database data. The SQL security features that protect stored data are described in 15. Finally, 16 discusses the system catalog, a collection of system tables that describe the structure of a database.
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13
Creating a Database
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SQL: The Complete Reference
any SQL users don t have to worry about creating a database; they use interactive or programmatic SQL to access a database of corporate information or to access some other database that has been created by someone else. In a typical corporate database, for example, the database administrator may give you permission to retrieve and perhaps to update the stored data. However, the administrator will not allow you to create new databases or to modify the structure of the existing tables. As you grow more comfortable with SQL, you will probably want to start creating your own private tables to store personal data such as engineering test results or sales forecasts. If you are using a multiuser database, you may want to create tables or even entire databases that will be shared with other users. If you are using a personal computer database, you will certainly want to create your own tables and databases to support your personal applications. This chapter describes the SQL language features that let you create databases and tables and define their structure.
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