Managing database transaction

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  • Introduction Part I: A SQL Concepts Overview HOUR 1 Welcome to the World of SQL Part II: Building Your Database HOUR 2 Defining Data Structures 3 Managing Database Objects 4 The Normalization Process 5 Manipulating Data 6 Managing Database Transaction

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  • Recall: logging methods provide reconstructing the DB to reflect the result of committed transactions locking (or validation) methods provide serializability of transactions Problem yet uncovered: "dirty data" data written by an uncommitted transaction (to buffers or to disk) may lead to inconsistency, if read by others

    ppt22p trinh02 23-01-2013 24 5   Download

  • Bài giảng Hệ quản trị cơ sở dữ liệu - Chương 12 giới thiệu về transaction management. Các nội dung được trình bày trong chương gồm có: Transactions, transaction ACID properties, concurrency in a DBMS, atomicity oftransactions,... Mời các bạn cùng tham khảo.

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  • Database Management Systems: Chapter 4 - Introduction to Transaction Processing Concepts and Theory Introduction to Transaction Processing, Transaction and System Concepts, Desirable Properties of Transactions, Characterizing Schedules based on Recoverability.

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  • Bài giảng "Chương I: Tổng quan về Hệ quản trị cơ sở dữ liệu Database Management System" nhằm giúp các bạn có được cái nhìn bao quát về cơ sở dữ liệu (Database) cũng như về hệ quản trị cơ sở dữ liệu (DBMS), hệ cơ sở dữ liệu (Database system), các yêu cầu khi xây dựng một DBMS, một số khái niệm quan trọng như: giao tác (transaction), Concurrent Control, khôi phục sau sự cố,...

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  • Everyone keeps data. Big organizations spend millions to look after their payroll, customer, and transaction data. The penalties for getting it wrong are severe: businesses may collapse, shareholders and customers lose money, and for many organizations (airlines, health boards, energy companies), it is not exaggerating to say that even personal safety may be put at risk. And then there are the lawsuits. The problems in successfully designing, installing, and maintaining such large databases are the subject of numerous books on data management and software engineering.

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  • Ebook "Database System Concepts" present on: Relational databases, database design, data storage and querying, transaction management, system architecture, data warehousing, data mining, and information retrieval,...

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  • SQL Server 2000 Programming by Example provides clear and concise examples of basic programming techniques used in SQL Server 2000 primarily using Transact-SQL. Even if you're a complete novice to SQL Server 2000 programming, you will benefit by reading through the book's logical process. SQL Server 2000 is introduced and explored, database structure is designed and built, and finally a variety of programming techniques are studied and reviewed.

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  • When you write stored procedures, triggers, and user-defined functions, you need to decide whether to use traditional Transact-SQL or a programming language that is compatible with the .NET Framework, such as Visual Basic .NET or C#. Transact- SQL is best for situations in which the code primarily performs data access with little or no procedural logic. Programming languages that are compatible with the .NET Framework are best-suited for computationally-intensive functions and procedures that feature complex logic or for situations where you want to take advantage of the .

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  • Planning and Organizing a Database Planning for your database is the first step in organizing and implementing a database system. First define how the database will be used. This determines what type of database you need to create that will meet the needs of your business, for example, data warehousing, high online transaction processing, or general purpose. After you determine the purpose and type, you must outline the database architecture that will be used.

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  • When a transaction ends with a ROLLBACK operation, a possible approach is to simply abort the transaction in all replicas without verifying if previously returned results were correct (e.g., this solution is adopted in [13]). In our system, this could be easily implemented by execut- ing a BFT operation that aborts the transaction in each replica. This approach does not lead to any inconsistency in the replicas as the database state is not modified.

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  • A primary concern of a multiuser database management system is how to control concurrency, which is the simultaneous access of the same data by many users. Without adequate concurrency controls, data could be updated or changed improperly, compromising data integrity. One way to manage data concurrency is to make each user wait for a turn. The goal of a database management system is to reduce that wait so it is either nonexistent or negligible to each user.

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  • Redo Log History All transactions are recorded in the online redo log files. This allows for automatic recovery of transactions in the event of a database failure. If the database is configured for NOARCHIVELOG mode, no redo history is saved to archived log files, and recovery operations are limited and a loss of transaction work may occur. This is the result of the automatic recycling of log files, where older log files needed for recovery are overwritten and only the most recent part of the transaction history is available.

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  • Backup Terminology Whole Database Backup Whole database backup (also known as whole backup) refers to a backup of all datafiles and the control file of the database. Whole backups can be performed when the database is closed or open. This is the most common method of backup. The whole backup that is taken when the database is closed (after the database is shut down using the NORMAL, IMMEDIATE, or TRANSACTIONAL options) is called a consistent backup.

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  • Incomplete Recovery Incomplete recovery reconstructs the database to a prior point in time (before the time of the failure). Note: This situation results in the loss of data from transactions committed after the time of recovery. This data will need to be reentered manually if required. Perform this recovery only when absolutely necessary. Incomplete recovery can be a difficult and time-consuming operation.

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  • Allocation of a Rollback Segment When a transaction begins, a rollback segment must be assigned to this transaction. A transaction can request a specific rollback segment using the following command: SET TRANSACTION USE ROLLBACK SEGMENT rollback_segment If no such request is made, the Oracle server chooses the rollback segment with the fewest transactions and assigns it to the transaction. Using Extents Transactions use extents of a rollback segment in a sequential, circular fashion, moving from one to the next after the current extent is full.

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  • • Microsoft’s latest database object model • Allows VB programmers to use a standard set of objects to refer to data from any source • .NET approach uses disconnected datasets with common data representation (data types) from multiple sources Visual

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  • Chapter 15 - Transaction management. This chapter presents a broad coverage of transaction management. Before you can understand DBMS support for transaction processing, you need a more detailed understanding of transaction concepts. This chapter describes properties of transactions, SQL statements to define transactions, and properties of transaction processing.

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  • Chapter 16 - Data warehouse technology and management. This chapter presents the technology and management of data warehouses to satisfy the requirements of decision support. Data warehouse technology complements and extends relational database technology beyond online transaction processing and simple query capabilities such as the GROUP BY clause in SQL.

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  • Database Management Systems: Chapter 0 - An Overview of a Database Management System includes about What is a DBMS? DBMS Capabilities, Data-Definition Language Commands, Answering the query, Buffer manager, Transaction processor’s tasks.

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