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Most major DBMS products use sophisticated locking techniques to handle concurrent SQL transactions for many simultaneous users. However, the basic concepts behind locking and transactions are very simple. Figure 12-10 shows a simple locking scheme and how it handles contention between two concurrent transactions. As Transaction A in the figure accesses the database, the DBMS automatically locks each piece of the database that the transaction retrieves or modifies. Transaction B proceeds in parallel, and the DBMS also locks the pieces of the database that it accesses. If Transaction B tries to access part of the database that has been locked by Transaction A, the DBMS blocks Transaction B, causing it to wait for the data to be unlocked. The DBMS releases the locks held by Transaction A only when it ends in a COMMIT or ROLLBACK operation. The DBMS then unblocks Transaction B, allowing it to proceed. Transaction B can now lock that piece of the database on its own behalf, protecting it from the effects of other transactions. As the figure shows, the locking technique temporarily gives a transaction exclusive access to a piece of a database, preventing other transactions from modifying the locked data. Locking thus solves all of the concurrent transaction problems. It prevents lost updates, uncommitted data, and inconsistent data from corrupting the database. However, locking introduces a new problem it may cause a transaction to wait for a very long time while the pieces of the database that it wants to access are locked by other transactions.

Locking can be implemented at various levels of the database. In its most basic form, the DBMS could lock the entire database for each transaction. This locking strategy

SELECT FROM WHERE ORDER GENRE ----Drama Drama Drama Drama Drama Drama Forgn Rmce Rmce MOVIE_GENRE_CODE AS GENRE, MOVIE_TITLE MOVIE MOVIE_GENRE_CODE IN ('Drama','Forgn','Rmce') BY MOVIE_GENRE_CODE, MOVIE_TITLE; MOVIE_TITLE ---------------------Big Fish Cold Mountain Lost in Translation Monster Mystic River Road to Perdition Das Boot 13 Going on 30 Two Weeks Notice

Figure 12-10.

would be simple to implement, but it would allow processing of only one transaction at a time. If the transaction included any think time at all (such as time to discuss an order with a customer), all other access to the database would be blocked during that time, leading to unacceptably slow performance. However, database-level locking may be appropriate for certain types of transactions, such as those that modify the structure of the database or for complex queries that must sequentially scan many large tables. In these cases, it may be more efficient to rapidly do a single locking operation, quickly

12:

List all movies where the description of the movie genre contains the word and . This requires a subselect to nd the values of MOVIE_GENRE_ CODE that have the word and in their description. Then the IN operator is used to nd movies that have one of the codes selected in the subselect. Subselects are covered in more detail in 5. For now, just keep in mind that the inner select (the one in parentheses) is executed rst and the result set from the inner select is used as the list of values by the IN operator in the outer select. Note that while several genres have descriptions that contain the word and , only one of these categories (Action and Adventure, or ActAd ) currently has movies in the video store. Of course, this is not a bad thing at all because this query can be run at a later time when the inventory might contain those additional genres.

execute the database operation, and then quickly unlock the database than to individually lock dozens of tables An enhanced form of locking is table-level locking In this scheme, the DBMS locks only the tables accessed by a transaction Other transactions can concurrently access other tables This technique permits more parallel processing, but can still lead to unacceptably slow performance in applications such as order entry, where many users must share access to the same table or tables Many DBMS products implement locking at the page level In this scheme, the DBMS locks individual blocks of data (pages) from the disk as they are accessed by a transaction Other transactions are prevented from accessing the locked pages but may access (and lock for themselves) other pages of data Page sizes of 2KB, 4KB, and 16KB are commonly used.

Figure 12-9 The can assembly on its stand (from above).