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does not exist in the table. (2) ' | | ' is a character join function. As with other functions, the index is deactivated. (3) ' + ' is a mathematical function. As with other mathematical functions, the index is deactivated. (4) The same index columns cannot be compared to each other, which will enable full table scanning.(+)A. If the number of records in a table that has more than 30% data is retrieved. Using indexes will have no significant efficiency gains.B. In certain situations, using an i
, the SGA is about 160 megabytes in size. Some parameters in the initialization parameter file have a decisive effect on the size of the SGA. Parameter db-block-buffers (number of buffers cached in the SGA), parameter shared-pool-size (number of bytes allocated to the shared SQL area), is the main influence of the SGA size. The Db-block-buffers parameter is the most important determinant of the SGA size and database
Client protocols Aliases The Protocol is the same as (2). You can specify more configurations. 3. sp_configure/reconfigure Displays or changes the global configuration settings of the current server. Many configurations need to be set through sp_configure. Syntax: sp_configure [ [ @configname = ] 'option_name' [ , [ @configvalue = ] 'value' ] ] reconfigure For example: To configure advanced options with sp_configure, you must first run sp_configure when the "show advanced options" op
the path of the tnsnames. ora file. 5. Open PL/SQL and click Cancel to go to the main interface. Select Preference in Tools and set Oracle Home to C: \ plsql \ odac_client, and OCI Library to C: \ plsql \ odac_client \ oci. dll. 6. Restart PL/SQL after the configuration is
time, PL/SQL is tightly integrated and PL + supports all SQL data types and null values. Supports object-oriented programming PL/SQL supports object-oriented programming in PL
error occurs; Slave has good portability and can be transplanted to another Oracle database; Shards are integrated into the database, making calls faster; ⒍ Reduces Network Interactions and improves program performance. When multiple SQL statements are used to implement the function, each statement must be passed on the client and server, and the execution resul
Introduction: Oracle DatabaseThere is no constraint. Oracle databases must comply with certain rules. As we all know, few of us work in isolation; most PL/SQL development work is carried out in a relatively large organization. But we basically work with our own device in our own compartment. Almost no
Label:Original: SQL Server performance Tuning (i)--judging system resource bottleneck from waiting stateView the status of all SQL Server tasks at that time (sleeping, runnable, or running) through the DMV2005, 2008 provides the following three view Tudon detailed query: DMV Use Sys.
. When a query is executed, SQL Server does not read more or less data than is actually required, so when executing the same query on the same dataset, the resulting logical read numbers are always the same.Why is it important to know the logical read value of SQL Server when executing queries in tuning query performance
Author: (US) Tony Andrews Translator: Chen Yong Yang Health Series name: Chapter Hua programmer library Publishing House: Machinery Industry Publishing House ISBN: 9787111425021 shelving time: -6-4 published on: July 4,: 16 webpage: 86 versions: 1-1 category: more about computers> DB2 SQL Performance Tuning tips computer books DB2
Original Title: Oracle and PL/SQL recipes: a problem-solution approach Author: (US) Josh Juneau Matt arena Translator: Political Commissar Name: turing Program Design Series Press: People's post and telecommunications Press ISBN: 9787115320766 Release Date: June 2013 publication date: 16 open pages: 376 versions: 1-1 category: computer> database>
Oracle Performance tuning is a broader and somewhat more complex topic, and the biggest problem for ordinary DBAs is where to start and what to do. All the information you know may be someone (a user) who reports a problem with the performance degradation of an application or query, and where do you start when faced wi
The ORACLE tutorial is as follows: Oracle PL/SQL getting started. I. Objective of PL/SQL Structured Query Language (SQL) is a common Language used to access relational databases. It is
Oracle performance, I will explain in detail in this respect3. Network conditions: Net*sql responsible for data on the network, a large number of SQL will slow down the network speed. For example, 10M network card and 100 of the network card has a very obvious impact on the net*sq
monitoring is necessary 207Thinking on the construction of 6.7 operation and maintenance platform--meta data management 2096.8 Monitoring blind spots and diagnostic cases 210Monitoring blind spots: A potential monitoring problem caused by dual 210Diagnostic Case: Standby CPU Usage Exception Optimization 213Diagnostic Case: Two alarm information combined with analysis of DG Problem 216Diagnostic case: Monitoring anti-monitoring error--an analysis of a Orabbix alarm 222Diagnostic case: Customizin
: (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
Label:I believe a lot of friends, whether it is to do development, architecture, or DBA, are often heard of the word "tuning". Talk about "tuning", may make a lot of technical staff heart passion, also may make a lot of people feel distressed, do not know how to start. Of course, there are many people who are dismissive of this, because not everyone does the project is very high
In earlier articles, the detect methodology in performance tuning was mentioned, and the Detect methodology was briefly reviewed here.Discover the problem: finding problemsExplore The conditions: Reasons to exploreTrack down possible approaches: providing a possible solutionExecute the most likely approach: perform the best possible solutionCheck of Success: Confirm success (if not successful, repeat the ab
Label:Free installation of Oracle clients using PL/SQLThe Oracle client is annoying, and deploying a connection to it usually requires the client to install it, and the installer requires the registry to be written on the target machine, assuming you're not a neat freak, you could still be stuck with something like this: when other programs on your machine rely o
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
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