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Questions about creating Oracle jobs through PL/SQL developer 8.0 [transfer] test environment: oracle9i, PL/SQL developer 8.0, PL/SQL developer 7.0 After a colleague created
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
1 exp Tuning 1.1 Use direct and recordlength options The direct parameter defines whether to use direct path (direct = y) or conventional path (direct = n) for export ). Conventional path export uses the SQL SELECT statement to extract data from the table. direct path export reads data directly from the disk to the PGA and writes the data to the export file as is, this avoids the data conversion process
Introduction to Oracle PL/SQL I. Objective of PL/SQL Structured Query Language (SQL) is a common language used to access relational databases. It is a fourth-generation language (4gl) and its execution features are non-procedur
Supports running OCI, occi, JDBC, JDBC-OCI files, support for multiple languages.Basic Lite is a basic Lite version that only contains English Error Descriptions and only supports Unicode, ASCII, and European character sets.Therefore, if the database server is a Chinese character set (such as simplified chinese_china.zhs16gbk), you must download the basic version. 1. Download and decompress the package to any directory. For example, X: \ instantclient_10_2 2. Configure Environment Variables 1
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/
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
Installation-free Oracle Client usage PL/SQL Connection Oracle As we all know PL/SQL Connection Oracle To install Orac
Oracle client installation without using PL/SQL to connect to Oracle everyone knows that using PL/SQL to connect to Oracle requires installing the
Before executing an SQL statement, Oracle needs to analyze the statement execution plan and then execute it according to the execution plan. The execution plan of the Analysis Statement is completed by the optimizer. In different cases, an SQL statement may have multiple execution plans, but at a certain point in time, there must be only one execution plan that i
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
1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install
1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install
An index is an optional structure maintained by Oracle that provides fast access to data. It is difficult to know exactly where to use the index, and it is advantageous to use the index to adjust the retrieval speed. When an index is established, you must specify the name of the table used for tracking and one or more table columns. Once an index is established, Oracle automatically maintains the index when
Tags: IP address server directory. COM class sign Ted cat remote serverFirst, the development environment requirements: The premise is that the computer must have an Oracle client installed. Installed the Pl-sql software Second, configure PL-SQ and connect Oracle
implement complex functions, you may need to pl/ Additional PL/SQL blocks are nested within the block.Six, block structureA PL/SQL block consists of three parts: the definition section, the execution section, and the Exception handling section.As shown below:Declare/* Defin
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
The ORACLE tutorial is: PL/SQL programming experience summary Developer Network Oracle. I usually encounter some problems in PL/SQL programming. I will summarize them in the form of Q A for you to share.1. Can pipelines be used t
This article describes how to adjust the performance of Oracle 9i on AIX, we all know that memory access conflicts occur when the actual applied memory of a process exceeds the total physical memory of the system, the system exchanges programs and data between memory and hard disk. Control Memory switching (Paging) A large number of memory swap operations will greatly affect the
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