oracle performance tuning tips

. 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

Test environment above Oracle database performance parameter settings1. Close the Recycle BinAlter system set Recyclebin=off2. Modify the size of the redo logThe default size of 11g is 50m if redo file compares small OLTP logs more than the case will cause more redo FileSwitch recommended to modify the default size at DBCA time 500m to 1G better.If you have already created and the table is small, you can ex

value that does not exceed 65536, because the upper limit for each IP packet is 65,536 bytes.The sb_max--tunable parameter sets the upper limit for the number of socket buffers queued for a single socket, which can control the total amount of buffer space used by the buffer (queued for sender or received sockets). This amount should normally be less than wall and approximately 4 times times the maximum value of TCP or UDP send and receive settings.The rfc1323--tunable parameter supports the TCP

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

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

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 (

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: 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

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

can significantly improve performance; For example, the thread pool can accelerate disk-sensitive tasks by an order of magnitude. We want you to try these techniques yourself. We would like to know what you said about the various performance improvement cases you have made.Online Resources Statista.com–share of the Internet economy in the gross domestic product in G-20 countries in 2016 L

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

Java performance tips and java tips Local decision. The overall performance of an application depends on the performance of each component. Below are some Java programming skills that help you improve application performance:

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

in main result set ). this can result in a very efficient SQL join. Typically. Lookup tables do not contain more than few thousand records and joining them with only 20 records will not take much I/O. Using my Oracle pagination technique we have already ced the parsing, joining, grouping and sorting work to a considerable extent, while not compromising the functionality. Hence, we see much faster query performanc