oracle performance tuning books

. Three, Oracle memory tuning Method When a performance problem arises in the production environment of the project, how do we determine which parameters need to be adjusted? 3.1 Check the library cache hit ratio for Oracle instances: Standard: generally greater than 99% Check mode: Select (SUM (reloads)/sum (Pins

the evaluation indexes before and after the database adjustment: The tradeoff between response time and throughput, the availability of database, the hit rate of database and the efficiency of memory usage, so as to measure the effect of adjusting measures and the direction of guiding adjustment.Performance tuning of an Oracle database should be done in a certain order, as the system's adjustments in the p

issues at every step of the environment creation. When creating a database, you also need to consider the functionality that affects maintainability. Databases that are easy to maintain can run normally for a longer time, which is also an important part of the overall performance. The create database statement in the "solution" section also takes into account the following maintainability features. Create an automatic UNDO tablespace (automatic UNDO

Tags: extracting day workload operation Dictionary sysdate requires module logic operationIn most cases, Oracle uses index t to traverse tables more quickly, and the optimizer improves performance primarily based on defined indexes. However, if the SQL code written in the WHERE clause of the SQL statement is not reasonable, it will cause the optimizer to delete the index and use a full table scan, which is

Tags: Oracle performance tuning Oracle database optimization Oracle Optimization training Oracle Performance Tuning

read times. The ways to refine each statement are:Check Optimizer statistics，Check the interpretation plan for the most efficient access pathMeasuringtry to replace SQL constructs, and test for possible new indexes, manifested views, and partitions. Test the performance of the entire application using the optimized SQL statement. Is overall performance improved? The method is reliable, but somewhat dilator

Tags: Oracle performance tuning Oracle database optimization Oracle Optimization training Oracle Performance Tuning

Tags: Oracle performance tuning Oracle database optimization Oracle Optimization training Oracle Performance Tuning

from pfile= '/home/oracle/init0321.ora '; --Create SPFile--reboot below (by default, SPFile is used)sql> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.Sql> startup;Note:Pfile and SPFile default location:SPFile ${oracle_install_path}/product/11.2.0/dbhome_1/dbs/spfileorcl.oraIf the parameter does not specify a pfile location, the following file is used by defaultPfile ${oracle_install_path}/product/11.2.0/dbhome_1/db

TablesA table describes an entity such as employees. You define a table with a table name, such as employees, and set of columns. In general, you give each column a name, a data type, and a width when you create the table.1. Ordinary heap table (heap-organized Tables)For all scenarios, applications with specific scenarios have a performance bottleneck, and alternative types of tables need to be replaced depending on the scenario.2. Global temp Table (

the hard disks. 6. Adjust operating system parameters such as the Oracle database running on UNIX operating systems, you can adjust the size of the UNIX data buffer, the size of the memory that each process can use, and so on. In fact, the database optimization measures mentioned above are interrelated. Oracle database performance degradation is basically the us

Tags: merging RDBMS LTE data file nbsp Select line div2016-11-22Subquery: Scalar subquery inline view (In-line views) semi-join/reverse-connect scalar subquery Select followed by subquery similar to a custom function to overwrite an inline view (In-line view) from followed by a subquery similar to Design view sub-query A condom query is a garbage design that can cause performance problems. A semi-connection is a subquery that has a in/exists in the ba

Anything can have a positive impact on Oracle performance, such as changing the Oracle initialization parameters, adjusting the corresponding SQL, etc. the problem with Oracle's instance tuning is that overloaded Oracle's SGA can cause serious performance problems. Adjustme

provide information on the use and performance of the main hardware components of the system, as well as the performance of the operating system itself. This information is critical for detecting potential resource consumption, such as CPU cycles and physical memory, as well as detecting poor performance of peripherals such as disk drives. Operating system stati

LoadRunner monitors OracleHttp://www.docin.com/p-92077154.html HP performance monitoring best practices-database resource monitoring-Oracle monitoring Oracle Database Performance Tuning FAQHttp://www.orafaq.com/wiki/Oracle_database_Performance_Tuning_FAQ

Importance of oracle data dictionary and dynamic performance table: because the data dictionary contains user information, we need to query the data dictionary when logging on and have permission information, we also need to query the data dictionary when performing operations, and we also need to query the data dictionary when operating data with constraints. Therefore, the data dictionary is very importan