resource intensive

1. fuzzy matching of queriestry to avoid using in a complex query Like '%parm1% ' -- a red-labeled percent sign will cause the index of the related column to be unusable and should not be used .Solutions :In fact, the script only needs to be

One: note the connection order in the WHERE clause:Oracle uses a bottom-up sequential parsing where clause, according to which the connection between tables must be written before other where conditions, and those that can filter out the maximum

1. Fuzzy Matching of queriesTry to avoid using the like '%parm1% ' in a complex query--red identifies the location of the percent sign to cause the index of the related column to be unusable, preferably not used.Workaround:In fact, the script only

Missing indexCase: There are a number of interface requests failed on a certain line, and the CPU usage is high on the server. The Activity Analyzer (a recent resource-intensive query) found that several queries had CPU time (milliseconds/sec) of

ObjectiveIn the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operator optimization techniques, the same emphasis

We have to do not only write SQL, but also to write a good performance of SQL, the following is the author of learning, excerpts, and summary of the departmentShare the information with you! Select the most efficient table name order

(1) Select the most efficient table name order (valid only in rule-based seo/' target= ' _blank ' > Optimizer):The ORACLE parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table

DBCP (database connection pool), DB connection pool. is a Java Connection pool project on Apache and a connection pool component used by Tomcat. The use of DBCP alone requires 2 packages:Commons-dbcp.jar and Commons-pool.jar. Because establishing a

1. Fuzzy Matching of queriesTry to avoid using the like '%parm1% ' in a complex query--red identifies the location of the percent sign to cause the index of the related column to be unusable, preferably not used.Workaround:In fact, the script only

WinDbg supports the following three types of commands:· General commands to debug a process· Point command to control the debugger· Extension commands, you can add custom commands called WinDbg, which are typically provided by extension DLLsPDB

First, the question of the proposedIn the early stage of application system development, because the database data is relatively small, for querying SQL statements, complex view of writing and so on is not aware of the performance of SQL statements,

reprinted from: Http://www.cnblogs.com/rootq/archive/2008/11/17/1334727.html (1) Select the most efficient table name order (valid only in the rule-based optimizer):The Oracle parser processes the table names in the FROM clause in a right-to-left

(1) Select the most efficient table name order (valid only in rule-based seo/' target= ' _blank ' > Optimizer):The ORACLE parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table

From: http://woainichenxueming.iteye.com/blog/726541I. Optimizing SQL statements in Oracle to improve operational efficiency1. Select the most efficient table name order (valid only in the rule-based optimizer)The Oracle parser processes the table

-How to determine if a binding variable exists in the system:Start by creating a table that holds the data you've collated:CREATE table T1 as select Sql_text from V$sqlarea;----V$sqlarea This view keeps track of shared cursor in all shared

(1) Select the most efficient table name order (valid only in rule-based seo/' target= ' _blank ' > Optimizer):The ORACLE parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table

We have to do not only write SQL, but also to write a good performance of SQL, the following for the author to learn, excerpts, and summarize some of the information to share with you! (Home of the script) (1) Select the most efficient table name

The single object is created when the script is loaded. The following code: varSingleton (function () {// common single mode // codeherereturn {};}) (); for resource-intensive or configuration-intensive units, maybe the more reasonable way is to put

Source text: Http://www.oschina.net/project/tag/178/gui?lang=36&os=0&sort=view&p=1Desktop application Development engineAlloydesktopAlloydesktop is the HTML5 native app development engine, an app development engine that can run Web pages like

For developing new software systems, object-oriented programming is undoubtedly the most widely used programming model today. Due to the persistence requirements of commercial data, relational database management system (RDBMS) has been widely used.