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Flowcharts In order to describe complex processes and data ow, we sometimes have to resort to a graphic description of the dynamics of an algorithm, a flowchart as shown in Fig 1-7 In these we will distinguish three types of activity: Control ow, the sequence of instruction executed by the processing unit under various conditions This sequence is described when owcharts are used to document a programming algorithm Control-data ow, the ow of data elements whose e ect is on the control ow of the computations Typical examples are counts, references, control switches that indicate whether an operation is permitted, whether an area is full or empty, and so forth These may be set by one program and used by another program Data ow, the ow of the bulk of the coded data as it is moved, merged, and processed to generate information for the bene t of the users of the system This ow is typically between les, memory, and input or output devices



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A brief introduction of materialized views makes sense in this chapter about views. The intent of this section is to illustrate the concept of materialized views, using a simple example. Normally, materialized views are mainly used in complex data warehousing environments, where the tables grow so big that the data volume causes unacceptable performance problems. An important property of data warehousing environments is that you don t change the data very often. Typically, there is a separate Extraction, Transformation, Loading (ETL) process that updates the data warehouse contents. Materialized views are also often used with distributed databases. In such environments, accessing data over the network can become a performance bottleneck. You can use materialized views to replicate data in a distributed database. To explore materialized views, let s revisit Listing 10-1 and add a third DDL command, as shown in Listing 10-21. Listing 10-21. Comparing Views, Tables, and Materialized Views SQL> create or replace VIEW dept20_v as 2 select * from employees where deptno = 20; View created. SQL> create TABLE dept20_t as 2 select * from employees where deptno = 20; Table created. SQL> create MATERIALIZED VIEW dept20_mv as 2 select * from employees where deptno = 20; Materialized view created. SQL> You already know the difference between a table and a view, but what is a materialized view Well, as the name suggests, it s a view for which you store both its definition and the query results. In other words, a materialized view has its own rows. Materialized views imply redundant data storage.





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The materialized view DEPT20_MV now contains all employees of department 20, and you can execute queries directly against DEPT20_MV, if you like. However, that s not the main purpose of creating materialized views, as you will learn from the remainder of this section.

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versioning of the primary data will greatly reduce the logging volume Resetting of the database to a prior version does not solve all recovery problems An e ect of a transaction which was carried out after the transaction to be undone will also be lost if the later transaction updated the same block More information is required if this case is to be handled correctly Even more problematic is dealing with the e ects of concurrent transactions The activity-logging techniques described in Sec 11-4 address these issues 11-3-4 Transaction Execution Transactions may be update requests with new data or may be queries Queries do not have a second phase The execution of update transaction is now accompanied by logging of su cient information to guarantee abort or completion The transaction manager, after receiving the commit request, veri es that all data required for completion have been secured and grants the transaction the permit to go ahead In a distributed database this veri cation may require communication with multiple or even all nodes Saving of the prior database state by logging also makes the undoing of a speci c transaction possible Transaction logging is often incorporated into a larger scheme for database protection, activity logging, which will be covered in Sec 11-4 The speci c data elements being logged are described there Activity logging also considers correction of erroneous output for query transactions The data elements logged for a transaction must be identi ed The transaction identi er must be unique and should be serial if the e ect of one transaction upon other transactions is to be evaluated For this purpose we may assign a sequential identi cation number to every transaction A time stamp with a su ciently small time increment can also provide a sequence number The date and time of transaction arrival is always useful It is in general important that the sequence in which the transactions were executed matches the sequence in which they may be restored.

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