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2 Performance tuning : Goals Minimize the response time for each query Maximize the throughput of the entire database server by minimizing network traffic, disk I/O, and CPU time.
3 Performance tuning contd. Performance issues should be considered throughout the development cycle, not at the end when the system is implemented. Many performance issues that result in significant improvements are achieved by careful design from the outset.
4 Performance tuning contd. System-level performance issues, such as memory, hardware, and so on, are certainly candidates for study, experience shows that the performance gain from these areas is often incremental. Generally, SQL Server automatically manages available hardware resources, reducing the need (and thus, the benefit) for extensive system-level manual tuning.
5 Performance tuning areas Database Design Describes how database design is the most effective way to improve overall performance. Database design includes the logical database schema (such as tables and constraints) and the physical attributes such as disk systems, object placement, and indexes.
6 Performance tuning areas Query_Tuning Describes how the correct design of the queries used by an application can significantly improve performance..
7 Performance tuning areas Application Design Describes how the correct design of the user application can significantly improve performance. Application design includes transaction boundaries, locking, and use of batches.
8 Performance tuning areas Optimizing Utility and Tool Performance Describes how some of the options available with the utilities and tools supplied with Microsoft SQL Server version 7.0 can highlight how performance of those tools can be improved and the effect of running these tools and your application at the same time.
9 Performance tuning areas Optimizing Server Performance Describes how settings on Microsoft Windows NT, Windows 95/98, and SQL Server can be changed to improve overall performance.
10 Database design Logical database design : It involves modeling your business requirements and data using database components such as tables and constraints without regard for how or where the data will be physically stored.
11 Database design Physical database design : It involves mapping the logical design onto physical media, taking advantage of the hardware and software features available that allow the data to be physically accessed and maintained as quickly as possible, and indexing.
12 Database design It is important to correctly design the database to model your business requirements and to take advantage of hardware and software features early in the development cycle of a database application because it is difficult to make changes to these components later.
13 Logical Database Design Using Microsoft SQL Server effectively begins with normalized database design. Normalization is the process of removing redundancies from the data. However, there are tradeoffs to normalization. Nevertheless, unnormalized data is a more common design problem in database applications than over-normalized data.
14 Logical Database Design Considerations CHECK constraints ensure that column values are valid. DEFAULT and NOT NULL constraints avoid the complexities (and opportunities for hidden application bugs) caused by missing column values.
15 Logical Database Design Considerations PRIMARY KEY and UNIQUE constraints enforce the uniqueness of rows (and implicitly create an index to do so). FOREIGN KEY constraints ensure that rows in dependent tables always have a matching master record.
16 Logical Database Design Considerations IDENTITY columns efficiently generate unique row identifiers. TIMESTAMP columns ensure efficient concurrency checking between multipleuser updates. User-defined data types ensure consistency of column definitions across the database.
17 Advantages? Data rules are visible to all users of the database, rather than being hidden in application logic.? Using these facilities also ensures that data integrity is enforced as efficiently as possible.
18 Physical Database Design The I/O subsystem (storage engine) is a key component of any relational database. A successful database implementation usually requires careful planning at the early stages of the project.
19 Physical Database Design Considerations The storage engine of a relational database requires much of this planning, including:? What type of disk hardware to use, such as RAID.? How to place your data onto the disks.? Which index design to use to improve query performance in accessing data.? How to set all configuration parameters appropriately for the database to perform well.
20 Partitioning Partitioning a database improves performance and eases maintenance. For example placing a table on one physical drive and related tables on a separate drive. Microsoft SQL Server filegroups can be used to specify on which disks to place the tables.
21 Hardware Partitioning Hardware partitioning designs the database to take advantage of the available hardware architecture.
22 Hardware Partitioning Examples? Multiprocessors that allow multiple threads of execution, permitting many queries to execute at the same time. Alternatively, a single query may be able to run faster on multiple processors by parallelizing. For example, each table referenced in the query can be scanned at the same time by a different thread.
23 Hardware Partitioning Examples? RAID devices that allow data to be striped across multiple disk drives, permitting faster access to the data because more read/write heads read data at the same time.? A table striped across multiple drives can typically be scanned faster than the same table stored on one drive. Alternatively, storing tables on separate drives from related tables can significantly improve the performance of queries joining those tables.
24 Horizontal Partitioning Horizontal partitioning segments a table into multiple tables, each containing the same number of columns but fewer rows. For example, a table containing 1 billion rows could be partitioned horizontally into 12 tables, with each smaller table representing one month of data for a given year. Any queries requiring a specific month s data reference the appropriate table only.
25 Horizontal Partitioning Determining how to partition the tables horizontally depends on how data is analyzed. Partition the tables so that queries reference as few tables as possible. Otherwise, excessive UNION queries, used to merge the tables logically at query time, can impair performance.
26 Vertical Partitioning Vertical partitioning segments a table into multiple tables containing fewer columns. The two types of vertical partitioning are normalization and row splitting.
27 Vertical Partitioning Normalization is the standard database process of removing redundant columns from a table and placing them in secondary tables linked to the primary table by primary key and foreign key relationships.
28 Vertical Partitioning Row splitting divides the original table vertically into tables with fewer columns. Each logical row in a split table matches the same logical row in the others. For example, joining the tenth row from each split table re-creates the original row.
29 Vertical Partitioning Vertical partitioning should be considered carefully because analyzing data from multiple partitions requires queries joining the tables, possibly affecting performance if partitions are very large.
30 Data Placement using Filegroups Microsoft SQL Server allows you to create tables or indexes on a specific filegroup within your database, rather than across all filegroups in a database. By creating a filegroup on a specific disk or RAID device, you can control where tables and indexes in your database are physically located. Reasons Improved query performance. Parallel queries
31 Data Placement using Filegroups Placing tables on Filegroups Placing indexes on Filegroups
32 Index Tuning Recommendations Indexes can be dropped, added, and changed without affecting the database schema or application design. Efficient index design is paramount to achieving good performance
33 Index Tuning Recommendations Write queries that update as many rows as possible in a single statement, rather than using multiple queries to update the same rows. Use the Index Tuning Wizard to analyze your queries and make index recommendations. Use integer keys for clustered indexes. Additionally, clustered indexes benefit from being created on unique, nonnull, or IDENTITY columns.
34 Index Tuning Recommendations Create nonclustered indexes on all columns frequently used in queries. This can maximize the use of covered queries. Examine column uniqueness. Examine data distribution in indexed columns. Often, a longrunning query is caused by indexing a column with few unique values, or by performing a join on such a column.
35 Optimizing Transaction Log Performance Create the transaction log on a physically separate disk or RAID (redundant array of independent disks) device. The transaction log file is written serially; therefore, using a separate, dedicated disk allows the disk heads to stay in place for the next write operation.
36 Optimizing Transaction Log Performance Set the original size of the transaction log file to a reasonable size to prevent the file from automatically expanding as more transaction log space is needed. As the transaction log expands, a new virtual log file is created, and write operations to the transaction log wait while the transaction log is expanded. If the transaction log expands too frequently, performance can be affected.
37 Optimizing Transaction Log Performance Set the file growth increment percentage to a reasonable size to prevent the file from growing by too small a value. If the file growth is too small compared to the number of log records being written to the transaction log, then the transaction log may need to expand constantly, affecting performance.
38 Optimizing Transaction Log Performance Manually shrink the transaction log files rather than allowing Microsoft SQL Server to shrink the files automatically. Shrinking the transaction log can affect performance on a busy system due to the movement and locking of data pages
39 Optimizing tempdb Performance Allow the tempdb database to automatically expand as needed. This ensures that queries that generate larger than expected intermediate result sets stored in the tempdb database are not terminated before execution is complete.
40 Optimizing tempdb Performance Set the original size of the tempdb database files to a reasonable size to avoid the files from automatically expanding as more space is needed. If the tempdb database expands too frequently, performance can be affected.
41 Optimizing tempdb Performance Set the file growth increment percentage to a reasonable size to avoid the tempdb database files from growing by too small a value. If the file growth is too small compared to amount of data being written to the tempdb database, then tempdb may need to constantly expand, affecting performance.
42 Optimizing tempdb Performance Place the tempdb database on a fast I/O subsystem to ensure good performance. Stripe the tempdb database across multiple disks for better performance. Use filegroups to place the tempdb database on disks different from those used by user databases.
43 File Systems Server performance is not affected by the file system used (FAT or NTFS). Your choice of file system should be determined by factors other than performance.? The File Allocation Table (FAT) file system allows dual booting with computers running Microsoft MS-DOS or Microsoft Windows 95/98.? The Microsoft Windows NT file system (NTFS) has security and recovery advantages. If you do not need to dual-boot Windows NT with MS- DOS or Windows 95/98, NTFS is recommended.
44 Query tuning Query tuning involves monitoring and determining if and why a query is not performing as optimally as possible, and taking steps to resolve any problems. Understanding how to create and update column statistics and indexes can significantly improve query performance
45 Slow queries Unexpectedly long-lasting queries and updates can be caused by:? Slow network communication.? Inadequate memory in the server computer, or not enough memory available Lack of useful statistics.? Lack of statistics.? Out-of-date statistics.? Lack of useful indexes.? Lack of useful data striping.
46 Check list for long lasting queries Is the performance problem related to a component other than queries? For example, is the problem slow network performance? Are there any other components that might be causing or contributing to performance degradation? Windows NT Performance Monitor can be used to monitor the performance of SQL Server and non- SQL Server related components.
47 Check list for long lasting queries If the performance issue is related to queries, which query or set of queries is involved? Use SQL Server Profiler to help identify the slow query or queries. In SQL Server Query Analyzer, you can also turn on the graphical execution plan option to view a graphical representation of how SQL Server retrieves data.
48 Check list for long lasting queries Set statement to enable the SHOWPLAN STATISTICS IO STATISTICS TIME STATISTICS PROFILE
49 Check list for long lasting queries Was the query optimized with useful statistics? Are the query statistics up-to-date? Are the statistics automatically updated? These statistics can be used by the query processor to determine the optimal strategy for evaluating a query. Maintaining additional statistics on nonindexed columns involved in join operations can improve query performance.
50 Check list for long lasting queries Are suitable indexes available? Would adding one or more indexes improve query performance? Index tuning wizard in Enterprise Manager and index analysis in Query Analyzer can be used.
51 Check list for long lasting queries Are there any data or index hot spots? Consider using disk striping.
52 Check list for long lasting queries Is the query optimizer provided with the best opportunity to optimize a complex query?
53 Query tuning recommendations Some queries are inherently resource intensive. This is related to fundamental database and index issues. These queries are not inefficient, because the query optimizer will implement the queries in the most efficient fashion possible. However, they are resource intensive, and the setoriented nature of Transact-SQL can make them appear inefficient.
54 Query tuning recommendations For example, the following types of queries can be resource intensive:? Queries returning large result sets? Highly nonunique WHERE clauses
55 Query tuning recommendations Add more memory (especially if the server runs many complex queries and several of the queries execute slowly). Run SQL Server on a computer with more than one processor. Multiple processors allow SQL Server to make use of parallel queries.
56 Performance & Application design A well-designed application allows SQL Server to support thousands of concurrent users. Conversely, a poorly designed application prevents even the most powerful server platform from handling more than a few users.
57 Application design issues Eliminate excessive network traffic. Use small result sets. Allow cancellation of a query in progress when the user needs to regain control of the application. Always implement a query or lock time-out. Do not use application development tools that do not allow explicit control over the SQL statements sent to SQL Server.
58 Application design issues Do not intermix decision support and online transaction processing (OLTP) queries. Do not use cursors more than necessary. Keep transactions as short as possible. Use stored procedures. Always process all results to completion. Ensure that your application is designed to avoid deadlocks.
59 Optimizing Server Performance Microsoft SQL Server automatically tunes many of the server configuration options, therefore requiring little, if any, tuning by a system administrator. Although these configuration options can be modified by the system administrator, it is generally recommended that they are left at their default values, allowing SQL Server to automatically tune itself based on run-time conditions.
60 Optimizing Server Performance However, if necessary, the following components can be configured to optimize server performance:? SQL Server Memory? I/O subsystem? Microsoft Windows NT options
61 Optimizing Server Performance Windows NT options on the server can be set to maximize throughput configure server tasking configure virtual memory
62 Monitoring Performance Microsoft SQL Server provides a comprehensive set of tools for monitoring events in SQL Server. The choice of tool depends on the events to be monitored and the type of monitoring.
63 Tools for Monitoring Performance SQL Server Profiler Windows NT Performance Monitor Current activity in (SQL Server Enterprise Manager) Error logs sp_who sp_lock
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