-side cursorsCompared to server-side cursors, client cursors can reduce server and network overhead and also reduce lockout time.7. Do not ignore the problem of modifying the same record at the same timeSometimes, two users modify the same record at the same time, so that the latter modifies the previous modifier's actions, and some updates are lost. To handle this situation, create a timestamp field, check
that improve the performance of various programs are meaningful to the SQL Server community
Disk
For SQL Server to function effectively, monitoring and optimizing the disk subsystem of SQL
SQL Server's common performance problems can be considered in three aspects: operating system and database configuration, table/index/storage settings, and SQL statements. For delivered systems, it is often difficult to optimize SQL statements due to actual conditions. This article summarizes the practical methods for
, generally believed that the closer the data from the method efficiency higher.
With a careful use of cascading deletes and cascading updates, cascading deletes and cascading updates as new features of SQL SERVER 2000, are reserved in 2005 and should be available. I'm talking about caution here, because cascading deletions and cascading updates have broken through the traditional definition of foreign keys
are in order.Then, when SQL Server is doing all of these things, it creates locks to ensure that users get meaningful results. SQL Server guarantees that when each statement is executed, the database is fully predictable (for example, predicting how SQL executes) and managi
I. Preface
Index plays an important role in database performance. The advantages and disadvantages of index design directly affect the efficiency of DB execution. Therefore, when performing DB tuning, some of them will start to process the index. SQL server also provides a good tool for Database Engine Tuning Advisor and provides some advice on index creation and
Designing an application system does not seem difficult, but it is not easy to optimize the system performance. There are multiple options in terms of development tools, database design, application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This article takes SQL Server
Label:As a DBA, troubleshooting SQL Server is one of our responsibilities, and a lot of people each month bring us a variety of performance issues that can't be explained but solved. I've heard many times that the performance problems of previous SQL
During database design, sometimes attribute record values belonging to the same person are stored in multiple records for the purpose of data standardization, you want to merge multiple attribute data into one row for display. This is a row-to-column conversion.
For example, the score table.
What is the efficiency of Row-to-column conversion? I tried the following three methods to perform a row-to-column test. The number of records in the test data table is 120Tens of thousands of fields1
Label:Today I would like to talk about a special topic in SQL Server--Instant file initialization (Instant initialization). For your instance of SQL Server, if you enable Instant file initialization, you will get a huge performance boost under certain circumstances. Instant
Tags: instance default help input extern data package MSDN One fixOriginal: SQL Server performance Tuning resource waiting network I/OI. OverviewThe main wait for network I/O is async_network_io, when SQL Server returns a data result set to the client, the result set is popu
Tags: des c style Blog Code AOriginal: [Translate]--SQL server 5 performance killers using linked serversForeword: This article is to blog http://www.dbnewsfeed.com/2012/09/08/5-performance-killers-when-working-with-linked-servers/ Translation, if the translation is not good or bad place, please point out, we study pro
In a large database, performance has become one of the focuses of attention. How to Make the efficient and effective operation of the database become an issue that must be considered by database administrators and developers. Performance is the measure of efficiency when one or more applications run in the same environment. Performance is usually expressed by res
report server cache per second.
Memory Cache Hits/sec
The number of times per second that the report was retrieved from the memory cache. The memory cache is part of the report services cache, which stores reports that are displayed in memory or in temporary files. This will provide the best performance for the request because there is no need to process it. When the memory cache is availabl
Preface
Indexes are one of the most important objects in relational databases. They can significantly reduce disk I/O and logical read consumption and improve the query performance of SELECT statements. However, it is a double-edged sword. Improper use affects performance: it requires additional space to store the index information and requires additional overhead to maintain index synchronization when data
Tag: Style color IO using strong SP data on problemIn recent times, has been exploring the SQL Server query performance issues, of course, also aimless search for a lot of information, but also from the online great God's articles learned a lot, here, to the great God salute. It is by the great God selfless dedication of the influence of the spirit, so, the young
1. The problem system has a module that needs to query data in the Oracle database. Currently, this is achieved by creating a linked server. The current query statement of limit is a simple
1. The problem system has a module that needs to query data in the Oracle database. Currently, this is achieved by creating a linked server. SQL
SQL Server Performance Tuning 3 (Index) MaintenanceHeat1 reviews Brook Stream GrassSQL Server Performance Tuning 3 (Index) MaintenanceObjectiveThe previous article describes how to improve the query performance of a database by b
SQL Server Full-text indexing performance has been not too good, listen to colleagues today to share, found a skill, go back to try, found that can obviously improve the performance of full-text indexing, generally can improve twice times +
Original SQL statement:
SELECT
rows reserved data index_size unused
TB_WCB 9439661 317208 kb 167168 KB 149872 KB 168 KB
*/ we found that the size before index compression was 329M. And after compression is 149M, the compression ratio is 45%. The effect is also very obvious. Summarize: Compression through tables and indexes. We can reduce the disk space occupied by the table, this is only part of it, and more importantly, reading the same amount of data, just need to read less data pages,
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