oracle performance analyzer

record is added to a table or the index column is modified. This means that each record's insert, DELETE, and update will pay more than 4, 5 disk I/O. Because indexes require additional storage space and processing, those unnecessary indexes can slow query response time. and the larger the table, the more serious the impact.The places to be aware of using indexes:1 . To avoid using not on the index column, we want to avoid using not on the index column, which does not produce the same effect as

As a development/ tester , more or less have to deal with the database, and the operation of the database is ultimately SQL statements, all operations to the end are operational data, then the control of SQL performance has become a very important task in our work. Here are some practical ways to look at Oracle performance:1. Query the number of connections per

In many cases, when the application administrator notifies us that the application is very slow and the database is very slow, we also find the same problem when performing the Select statements in the database for several examples, sometimes we will not be able to get started, because we believe that the various life-saving rates of the database meet the recommendations of the Oracle documentation. In fact, today's optimization has been transformed t

Lecture 01st: Chapter 01 -- Overview of Oracle9i Database Performance Tuning Lecture 02nd: Chapter 01 -- Overview of Oracle9i Database Performance Tuning Lecture 03rd: Chapter 02 -- Diagnostic and tuning tools Lecture 04th: Chapter 02 -- Diagnostic and tuning tools Lecture 05th: Chapter 02 -- Diagnostic and tuning tools Lecture 06th: Chapter 02 -- Diagnostic and tuning tools Lecture 07th: Chapter 03 -- Data

Access tableORACLE uses two ways to access records in a table:A. Full table scanA full table scan is the sequential access to each record in the table. Oracle optimizes full-table scanning in a way that reads multiple data blocks (database block).B. Accessing the table through ROWIDYou can use ROWID-based access to improve the efficiency of your Access tables, ROWID contains the physical location information that is recorded in the table.Oracle emplo

In the key points of Oracle performance adjustment, it is also very important to improve the efficiency of the block. We also need to pay attention to some things in improving the efficiency of the block. The following is a detailed description of the issues that need to be paid attention to when Oracle performance is

oracle| Data | database | performance Oracle database is favored by more and more enterprises because of its high reliability, security and compatibility. How to keep Oracle databases in good performance is a concern for many database administrators and may be considered in

In oracle, how does one determine SQL statements with poor performance? When SQL statements are involved, there are two aspects of poor performance: CPU-intensive statements (CPU-intensivestatements) and IO-intensive statements (IO-intensivestatements ). How to determine SQL statements with poor performance in

Oracle performance optimization operation (1) select the most efficient table name sequence (only valid in the rule-based Optimizer ): the ORACLE parser processes the table names in the FROM clause in the order FROM right to left. The table written in the FROM clause (basic table driving table) will be processed first, when the FROM clause contains multiple table

It is often asked whether the conditional writing sequence of the Where clause in oracle has an impact on SQL Performance. My intuition is that if this order has an impact, Oracle should have been able to achieve automatic optimization for a long time, however, there has been no conclusive evidence in this regard. Articles found on the Internet generally think th

. In win32, only PHP3 can connect to the oracle Database. Therefore, only the performance of connecting oracle with PHP3 is tested. I believe that after the official version of PHP4 is released, the speed of connecting oracle with PHP4 should be improved. In LINUX, I only tested the

Tags: list img Direct processing manager requires POS manual sed Take the training of Oracle recently, and make a study summary here. 1, Oracle Database tuning can not only expect to modify a few database parameters to have a clear effect, the problem is more in the application, educating developers to correctly use the database is a heavy task. 2, Oracle databas

. therefore, few resources are called and the execution time is short. (The translator Press: TRUNCATE applies only to deleting the entire table, and TRUNCATE is DDL rather than DML) (10) Use COMMIT as much as possible: as long as possible, use COMMIT as much as possible in the program. In this way, the program's performance is improved, and the demand will be reduced due to the resources released by COMMIT: Resources released by COMMIT: A. Informatio

There are many Oracle Performance Tools. I accidentally saw Metalink Note (438452.1): Performance Tools Quick Reference Guide mentioned in Tanel Poder on a website. This document is indeed quite new, and there are several tools worth noting. LTOM：TheLiteOnboardMonitor Java program, positioned as "real-time Diagnosis Platform ". It has the automatic Sessi

The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2. 4. Select the most efficient table name sequence (only valid in the rule-based Optimizer) The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the table written in the FROM clause (basic table dr

Oracle performance optimization cursor and SQL, these SQL statements are strictly unable to share the cursor (that is, share the execution plan), but the execution plans required for these statements are Oracle performance optimization cursor and SQL, these SQL statements are strictly unable to share the cursor (that i

Tags: Oracle swingbenchSwingbench Introduction:The swingbench consists of a load generator, a coordinator, and a cluster overview. The software makes it possible to generate loads and map the transaction/response time of the chart.Swingbench can be used to demonstrate and test technologies such as real application clusters, online table rebuilds, standby databases, online backup and recovery, etc.The code included with the Swingbench includes 6 benchm

Tags: src report Introduction to Oracle. COM Stat ROM Understanding testThis blog record in a one-time testing process, the location of high CPU utilization bottleneck problem, the main location of SQL is subject to One, sql command positioning 1. first with top command monitoring system resources, if aix system, use topas top When scrolling data is refreshed, Discovery usercpu Gundam 98% !! Keep Top in the state, press shi

Oracle SQL Performance Optimization: 2. When a user establishes a connection with the database, an operation request is sent to the database, that is to say, send the previous SQL statement (or several or one PL/SQL package) to the database. After Oracle receives the SQL statement, it first performs a Hash function operation to obtain a Hash value, and then searc

Db_block_size (Database block size) the default Oracle block size is 2 kb, which is too small, because if we have an 8 KB data, the 2 kb database needs to read four disks before reading, Db_block_size (Database block size) the default Oracle block size is 2 kb, which is too small, because if we have an 8 KB data, the 2 kb database needs to read four disks before reading, Q: What are the initialization