oracle pl sql performance tuning

The Oracle tutorial you are looking at is an introductory overview of Oracle Pl/sql. First, the purpose of pl/sql appearanceStructured Query Language (structured query Language, referred to as

The maximum and minimum values of Histogram are oracle internal. The values queried by SQL select are encrypted. For example, all_tab_cols.low_value and all_tab_cols.high_value store the maximum and minimum values of a field in a table. However, if you select the field directly, it is a password and cannot be read. Oracle provides two methods to solve the proble

Recently, the following project encountered an urgent problem, my old horse and young people to fight together. The problem is that many queries are incredibly slow when the pressure data is poured into the database. Said there must be some basic guidelines for performance issues. The order of performance problems tunning 1 Architecture design (software architecture and database design, poor design is alm

execution plan you can see that the performance improvement is still very large. This is the data of the test environment, if the data volume is large, the advantage is more obvious.So for this problem, the cause is that there is a job data processing frequency is relatively high, in the test environment is difficult to locate where there is a problem, and the speed can also be accepted, but in the production environment is always slower, in fact, th

some of the following requirements: Reasonable response time. The results are accurate. Can be used during the day. In order to meet the above requirements, we should consider adjusting the DSS application system from the following aspects. 1. In the use of application logic and declarative constraints to maintain integrity, it is worth remembering that the cost of declaring integrity constraints is small. In DSS system, correlation integrity constraint and table CHECK constraint are the m

Tags: imp config file success tool ... prot www oracle shareFirst download instantclient can be downloaded to the Oracle website, to register the account, must be under the corresponding version, otherwise unsuccessful, 10g,11g version of, I have been sent up, free download: Is crossing, wait a minute Configuration file Tnsnames.ora This one place is generally put (network/admin), only in

2014-08-23 BaoxinjianI. Summary A script that is circulated online to query the efficiency of a single SQL query and export it as an HTML report, similar in function to Dbms_profilerQuery sql_id by session, only run script, export as HTML reportThe SQL script: Http://files.cnblogs.com/eastsea/sqlcheck.zipIi. cases-Using the script data SQL

Tags: Profiler Performance Performance Analyzer tuning performance calibrationSQL Server Profiler-performance tuningPerformance has enough reason to become a hot topic. Today's business is fiercely competitive, and if users think that an application is too slow, they will im

First download instantclient. You can download it from the oracle official website. To register an account, you must download the corresponding version. Otherwise, it will fail. For 10G and 11G versions, I have already uploaded it. Free Download: uploading... please wait for the configuration file tnsnames. ora is usually stored in one place (networkADMIN), only in plsql ----- tools -- proferences First download instantclient. You can download it from

whenever possible. This section will be a topic at the end of this series. A detailed description of the process is presented here (simplification – Exploration – implementation).Summarize:This paper introduces the process of compiling query, and the concrete content of generating cache, reusing cache, recompiling, etc. There are a number of things to note about optimizing our T-SQL statements, and the more hits we have on the execution plan cache, t

introduction to the basics. from "SQL statement"/"SQL function" to "PL/SQL control structure" to "Exception Handling" to "Stored Procedure"/"function"/"cursor "/" trigger ", etc. along the way, you can have a good grasp of PL/SQL

For beginners, Oracle's database language PL/SQL is always a bit strange. It is called a host language and, as its name suggests, it is dependent on something to survive, PL/SQL is attached to the Oracle database, and its runtime environment is the

VARCHAR2) isBeginINSERT into EMP (empno,ename) values (in_no,in_name);EndThe out parameter represents the user's outputProgram Demo:Create or Replace procedure My_pro (In_no in Number,out_name out varchar2,out_sal off number) isBeginSelect Ename,sal to Out_name,out_sal from EMP where empno=in_no;Endin Sqlplus, you want the value after the process with the output has finished executingMethod 1: Write anonymous blocksDeclareV_name Emp.ename%type;V_sal Emp.sal%type;BeginMy_pro (7369,v_name,v_sal);

Oracle pl/SQL programming the use of SQL statements select must have a return record, do not report an error saying that no data is found and must have an into select statement to return one and only one record cannot be written as where deptno = 10 because multiple records will be returned. Of course, the record menti

Global Zone (PGA):This system diagram is very important to hear, many companies interview request handwriting this figureInstallation of the 3.pl/sql toolThe first installation did not succeed, under the CSDN resources, now think of it should be tnsnames.ora there is a Sqlnet.ora two files are not configured, resulting in the connection when the detection of the database is only a 222222222, go in to say n