Buffer management

Index là phương tiện rất mạnh để tăng hiệu năng thực hiện của câu lệnh. Bài giảng chương 10 này sẽ cung cấp một số kiến thức liên quan đến Indexing để người học có thể nắm bắt được những tiện ích của công cụ index trong CSDL. Mời các bạn cùng tham khảo.

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Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted

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Statistics collected and the method of collection: Logical reads: Sampled Buffer busy waits: Continuous Db block changes : Sampled Physical reads: Continuous Physical writes: Continuous Physical reads direct: Continuous Physical writes direct: Continuous Global cache cr blocks served: Continuous Global cache current blocks served: Continuous ITL waits: Continuous Row lock waits: Continuous

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Using Online Redo Log Files Online redo log files provide the means to redo transactions in the event of a database failure. Every transaction is written synchronously to the Redo Log Buffer, then gets flushed to the online redo log files in order to provide a recovery mechanism in case of media failure. (With exceptions such as direct load inserts in objects with the NOLOGGING clause enabled.) This includes transactions that have not yet been committed, undo segment information, and schema and object management statements.

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After completing this lesson, you should be able to do the following: Monitor and size the redo log buffer Monitor and size the Java pool Control the amount of Java session memory used by a session

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After completing this lesson, you should be able to do the following: Implement dynamic SGA allocation Dynamically adjust the buffer caches Dynamically adjust the shared pool

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After completing this lesson, you should be able to do the following: Employ the buffer cache sizing advisor Describe how the buffer cache is used by different Oracle processes Create and manage different buffer caches Monitor the use of the buffer caches Identify and resolve buffer cacheperformance problems

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Loading Data Several methods are available for loading data into tables in an Oracle database. Of the methods available Direct-Load insert and SQL*Loader are discussed here. SQL*Loader SQL*Loader loads data from external files into tables of an Oracle database. It has a powerful data parsing engine that puts little limitation on the format of the data in the datafile. Direct-Load insert Direct-load insert can be used to copy data from one table to another table within the same database.

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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

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Process Synchronization Background The Critical-Section Problem Peterson’s Solution Synchronization Hardware Semaphores Classic Problems of Synchronization Monitors Synchronization Examples Atomic Transactions Silberschatz, Galvin and Gagne ©2005 .Background Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes Suppose that we wanted to provide a solution to the consumer-producer problem that fills all the buffers.

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Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Management of acidosis: the role of buffer agents...

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