Performance tuning

The paper analyzes and determines the optimal parameters of tuned mass damper to reduce torsional vibration for the machine shaft. The research steps are as follows. First, the optimal parameters of tuned mass damper for the shafts are given by using the maximization of equivalent viscous resistance method. Second, a numerical simulation is performed for configuration of machine shaft to validate the effectiveness of the obtained analytical results.

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In this paper, we describe the application of CRO algorithm to search optimal parameters for PID controller because CRO combines both features of local and global searching techniques to increase the chance of finding global solution. The comparison of tuning PID controller by CRO and traditional Ziegler-Nichols method is also presented. The simulated results show the advantages of tuning PID using CRO compared to traditional methods in terms of performance indices and transient responses.

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Redundant Arrays of Inexpensive Disks Technology (RAID)

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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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Example of Statspack Report

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Globalization Support Features Globalization Support ensures that database utilities and error messages, sort order, date, time, monetary, numeric, and calendar conventions automatically adapt to the native language. Oracle currently supports 57 languages, 88 territories, 84 linguistic sorts (71 monolingual and 13 multilingual), and 235 encoded character sets. The language-dependent operations are controlled by a number of parameters and environment variables on both the client and the server sides. The server and the client may run in the same or different locations.

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After completing this lesson, you should be able to do the following: Describe the features of multitable inserts Use the following types of multitable inserts Unconditional INSERT Pivoting INSERT Conditional ALL INSERT Conditional FIRST INSERT Create and use external tables Name the index at the time of creating a primary key constraint

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After completing this lesson, you should be able to do the following: Use the Oracle tuning methodology to diagnose and resolve performance problems Use Oracle tools to diagnose performance problems Understand the goals of the workshop

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Data Loading Methods 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. Export and Import are covered in the Oracle9i Database Administration Fundamentals II course. SQL*Loader SQL*Loader loads data from external files into tables of an Oracle database. It has a powerful data parsing engine that places little limitation on the format of the data in the data file. Direct Load Direct Load insert can be used to copy data from one table to another table within the same database.

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After completing this lesson, you should be able to do the following: Describe different system architectures Describe the primary steps of OS tuning Identify similarities between OS and DB tuning Understand virtual memory and paging Explain the difference between a process and a thread

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After completing this lesson, you should be able to do the following: Interpret the concept of a hierarchical query Create a tree-structured report Format hierarchical data Exclude branches from the tree structure

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Auditing If an unauthorized user is deleting data, then the DBA might decide to audit all connections to the database and all successful and unsuccessful deletions from all tables in the database. The DBA can gather statistics about which tables are being updated, how many logical inputs/outputs (I/Os) are performed, and how many concurrent users connect at peak times.

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After completing this lesson, you should be able to do the following: Set up Database Resource Manager Assign users to Resource Manager groups Create resource plans within groups

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After completing this lesson, you should be able to do the following: Write a multiple-column subquery Describe and explain the behavior of subqueries when null values are retrieved Write a subquery in a FROM clause Use scalar subqueries in SQL Describe the types of problems that can be solved with correlated subqueries Write correlated subqueries Update and delete rows using correlated subqueries Use the EXISTS and NOT EXISTS operators Use the WITH clause

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Oracle provides for easy and controlled privilege management through roles. Roles are named groups of related privileges that are granted to users or to other roles. They are designed to ease the administration of privileges in the database. Role characteristics Roles can be granted to and revoked from users with the same commands that are used to grant and revoke system privileges. Roles can be granted to any user or role. However, a role cannot be granted to itself and cannot be granted circularly. A role can consist of both system and object privileges.

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After completing this lesson, you should be able to do the following: Use the ROLLUP operation to producesubtotal values Use the CUBE operation to produce cross-tabulation values Use the GROUPING function to identify the row values created by ROLLUP or CUBE Use GROUPING SETS to produce a single result set

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Managing Privileges A privilege is a right to execute a particular type of SQL statement or to access another user’s object. These include the right to: Connect to a database Create a table Select rows from another user’s table Execute another user’s stored procedure System privileges Each system privilege allows a user to perform a particular database operation or class of database operations; for example, the privilege to create tablespaces is a system privilege.

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After completing this lesson, you should be able to do the following: Define levels of locking Identify causes of contention Prevent locking problems Use Oracle utilities to detect lock contention Resolve contention in an emergency Resolve deadlock conditions

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After completing this lesson, you should be able todo the following: Create materialized views Refresh materialized views Create nested materialized views Create UNION ALL materialized views Explain the use of query rewrites Enable and control query rewrites

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After completing this lesson, you should be able use the following datetime functions: TZ_OFFSET CURRENT_DATE CURRENT_TIMESTAMP LOCALTIMESTAMP DBTIMEZONE SESSIONTIMEZONE EXTRACT FROM_TZ TO_TIMESTAMP TO_TIMESTAMP_TZ TO_YMINTERVAL

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