pl sql performance tuning techniques

I believe you are attracted by the words of performance, but I want to focus on the optimization of the idea, this is more important than the optimization skills, and the result, I do not want to say that it is a hundredfold ascension, "from the Black" "a bit."There is a real idea to discuss with you, is a SQL statement if the original run 20 seconds, optimized to 1 seconds, the

Label:Original: SQL Server database Performance tuning tipsThe reasons for the slow query are many, and the following are common: 1. No index or index is not used; 2, I/O throughput is small, forming a bottleneck effect; 3, insufficient memory; 4, the network speed is slow; 5, the amount of data queried is too large; 6, lock or deadlock; 7, the return of unnecess

Tags: disco net text http speed data start time NTS database applicationOriginal: SQL Performance Detection Tool: SQL Server Profiler and Optimization tool: Database Engine Tuning Advisor I. Summary of TOOLS? database application system performance is low, it needs to be opt

Trust a lot of friends, whether it is to do development, architecture, or DBA, are often heard that the word "tune". Speaking of "tune", may let a lot of technical staff heart surging, may also make a lot of people feel distressed. Of course, there are a lot of people are dismissive of this, because not everyone has access to the project is very large, and not everyone does the project is very high performance requirements. In the mainstream enterpri

When you use the PL/SQL Developer tool to log on to a new user for query, the following error is reported (PL/SQL Developer version: 7.1.51403 ):Dynamic Performance Tables notAccessible,Automatic Statistics disabledFor this sessionYou can disable statistics inThe preference

list options on the hook.9, formatted SQL (format)When you get a long SQL statement, you want to quickly see the logic, you can put it in the tool, format, and the logic of the statement is clear.10, the database automatically detect the connection situationBecause the database does not operate after a period of time, it will automatically disconnect, and then need to manually connect themselves, because o

milliseconds) above and the maximum wait time as a reference. Using the information provided by Sys.sysprocesses to count, about sys.sysprocesses use can refer to "SQL Server performance tuning from user session state analysis". This view listens for blocking information over a period of time. You can set a monitor statement to run every 10 seconds, storing bloc

to archive, partition, table sharding, etc) Software System (operating system optimization, database system configuration, resource planning and monitoring, etc) Hardware infrastructure (Device specifications, hardware performance, Server Load balancer, Disaster Tolerance, etc) SQL statement writing, indexing and statistics, transactions and locks, application access code (too many connections, frequent sw

First, the problem description:PL/SQL Dynamic performance Tables not accessible,automatic Statistics disabled for this sessionWhen you open PL/SQL, the report is wrong.Ii. Solutions, sources and the Internet:Third method (recommended)Completely disable the function of PL/

indexes are fully utilized during execution. normally, if the index is fully utilized, the name of the execution step will be index seek. note: When analyzing Io, You need to execute the set statistics Io on statement to open the IO analysis.4. Based on the analysis results, add the corresponding indexes and reduce the I/O later.5. for stored procedures, the event viewer should be used to further filter their information. If spid is used (which can be obtained through select @ spid), then the m

PL/SQL PLS_INTEGER type provides some performance. If PLS_INTEGER is used, oracle uses the native machine algorithm. All other numeric data types are the same as the NUMBER data type. The result of using the C Language Algorithm Library is that the PLS_INTEGER value processing speed is much faster than the NUMBER integer, PLS_INTEGER does not encounter compatibil

poorly run applications outweigh the investment in human, program, and technology using reliable load testing methods. Therefore, I would like to provide the following list of load tests for your application, which will be a magic bullet to prevent your SQL Server performance tuning problem. Checklist: Load test--sql

When logging in to Oracle with PL/SQL Developer: Using a filter for all users can leads to poor performance!Analysis: Regardless of the configuration of Oracle, you will see very many tables, views, sequences, etc. that are not relevant to the current work when using the tree directory on the left side of Plsql, resulting in very slow opening timesSpecific soluti

. Experiments have found that different indexes can be created on the master/slave database without interfering with each other (this is related to replication configuration). This makes it possible to create more optimized indexes based on the different usage patterns of the master and from the database. I saw on a foreign blog that using the dynamic view of SQL Server 2005, indexes are automatically created based on the usage patterns of t

There should be different filegroups in the database before the partition table is created;Assuming the database name is Df17datapro, create the user table UserID, put the first 500,000 data in the primary filegroup, place the 50~100 in the FG1 filegroup, and put more than 100 in the FG2 filegroup1. Add File group Fg1,fg2ALTER DATABASE Df17datapro ADD FILEGROUP FG1ALTER DATABASE df17dataproadd FILEGROUP fg22. Adding files to a filegroupALTER TABLEDf17dataproADD FILE(NAME=Df17datapro1,filename=

SQL Server Performance Tuning 3 Index MaintenancePreface The previous article introduced how to improve database query performance by creating indexes, which is just the beginning. If you do not need proper maintenance in the future, the indexes you have previously created may even become a drag-and-drop attack and a h

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

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 populated into the output cache (ouput cache), an

Transferred from: http://www.cnblogs.com/MR_ke/archive/2010/08/25/1807856.htmlSQL 2005 Performance TuningSQL Server runs for a period of time, and as data accumulates, SQL runs less efficiently, and in order to use business system normal actions, IT departments often need to spend a high price on SQL tuning experts to

Dynamic Performance tables not accessible,Automatic statistics disabled for this session You can disable statistics in the preference menu, or obtanin selectPriviliges on the V $ session, V $ sesstat and V $ statname tablesThis error is reported for the first time when I log on to the database to query the table. Anyone who has seen this error may have a solution YesArticleThe user permission issue will be mentioned. The prompt here refers to the se