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: (Exception) This section starts with exception and ends with end Demo: declare– Optional variable, constant, cursor, user-defined special type begin– must --sql statement --pl/sql statement exception– Optional --Exception handling Section END; -Must be declared, executed, and made up of exce
Oracle----PL/SQLPL/SQL is a programming language that combines process language (procedural Language) with Structured Query Language (SQL)PL/SQL is unique to Oracle, and is an extension
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 integ
programs more robustOf course, in addition to these advantages, PL/SQL has other advantages, such as better performance, portability and compatibility, maintainability, ease of use and speed, and the ability to define identifiers to increase program readability.Iii. PL/SQL
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
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 tre
: Network Disk DownloadContent IntroductionEditing the volume of information contained in this book can improve your programming skills to a new level. You'll learn how to write dynamic PL/SQL programs and Oracle database interfaces, perform complex computations, and use advanced techniques to control error conditions.
SQL Server Performance Tuning entry (graphic version) Step 1: capture sample data during business peaks(About 2 hours ). The tool used is the profiler that comes with sqlserver, also known as the event probe. For example, after entering, click the button on the leftmost side to create a new trail: DBO permission is required for logon, therefore, you can log on wi
Tags: style http color os using Java AR Data code1. What is PL/SQL?PL/SQLIt is also a programming language called the Process SQL language (procedural language/sql). PL/SQLis aOracle DatabaseAn extension to the
IT Ninja Turtles PL/SQL Developer tips and shortcuts, Ninja Turtles developer 1. SQL plus Window: File-> New-> Command Window. This is similar to the SQL plus client tool of oracle, but it is much easier to use than it. 2. Set the
the data from disk into the Oracle buffer cache. if this happens too often the performance of the query or the entire database can suffer. typically this is caused by contention for "hot" blocks or objects so it is imperative to find out which data is being contended. once that is known this document lists several alternative methods for solving the issue. conclusion: Two or more sessions simultaneously ne
Tags: security numerical environment client standard technology share Web creation process Evel I. What is PL/SQL?PL/SQL (procedural language/sql) is an extension of Oracle in the standard SQL
be sorted, or it can be added to a column (like joins or additions). Any non-indexed item in the ORDER BY statement, or a computed expression, will slow down the query. Double-check the order BY statement to find non-indexed items or expressions that degrade performance. The solution to this problem is to rewrite the order BY statement to use the index, or you can establish another index for the column you are using, and you should absolutely avoid u
As mentioned in parts 1th and 2nd, there are several relatively easy steps to improve performance you can take, one of these steps involves using an automated tool to "guide" you to write SQL statements, there are many production performance analysis or performance tuning to
Label:To quickly use PL/SQL developer for Oracle database-related development, summarize some of the more frequently used tips below, from the network and your own tests 1. Switch schema --switch SchemaAlter session set current_schema= PO; --get Current Context informationSelectSys_context ('USERENV','Current_User')
This example describes Oracle's pl/sql. Share to everyone for your reference, specific as follows: First, what is Pl/sql? Pl/sql (procedural language/sql) is an extension of Oracle's
GROUP BY:Increase the efficiency of the group BY statement by filtering out unwanted records before group by. The following two queries return the same result but the second one is significantly faster.Copy CodeThe code is as follows:Low efficiency:SELECT JOB, AVG (SAL)From EMP GROUP job has job = ' president ' and AVG (SAL) >xxxEfficient:SELECT JOB, AVG (SAL)From EMPWHERE JOB = ' President 'OR job = ' MANAGER ' GROUP JOB having and AVG (SAL) >xxx7, usually, if the statement can avoid the use o
are very readable6. Use where to replace having (if possible)Optimize GROUP BY:Increase the efficiency of the group BY statement by filtering out unwanted records before group by. The following two queries return the same result but the second one is significantly faster. Copy the code code as follows: Low efficiency:SELECT JOB, AVG (SAL)From EMP GROUP job has job = ' president ' and AVG (SAL) >xxxEfficient:SELECT JOB, AVG (SAL)From EMPWHERE JOB = ' President 'OR job = ' MANAGER ' GROUP JOB hav
One of the practical skills that can greatly improve the performance of SQL TUNING optimization. When we perform SQL optimization, we often encounter the need to sort a large number of datasets and then retrieve the first part of the results from the sorted set. In this case, when we write
In Oracle9i, the bulk collect method is added for PL/SQL. You can integrate the retrieved records into a batch of Oracle memory tables to improve the performance of the select into, fetch into or returning into clause. Example:Create or replace type performance_obj as object ( Netlatency number (10) ); Create or replac
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