oracle pl sql performance tuning

Invoking Oracle's stored procedures and JDBC operations in Java is similar to the following steps1: Load Driver2: Link database and get a database link object3: Execute statement4: Operation result set5: Close ResourceThe premise is that the stored procedure is written.Create or replace procedure My_procedure isBeginINSERT into EMP (empno,ename) VALUES (9527, ' Tong Pak Fu ');EndJava Program Demo:Import java.sql.CallableStatement;Import java.sql.Connection;Import Java.sql.DriverManager;Import ja

Oracle SQL Tuning Health Check ScriptWe focus on the performance of database system, the main task of database tuning is to optimize SQL. Good data architecture design, with application system middleware and writing a beautiful

Label:A few days ago because of a oracle32bit client + PL/SQL connection not Oracle was the leader despise, asked me to use PL/SQL No, I installed the open PL/SQL login interface is not

Project situation: is a large company's internal office system, the system has two and the general enterprise application is not the same characteristics: first, the user is very much, the number of personnel reached about 2W, the other is the form of hierarchical management, each branch of data management. Our positioning: We are as a business platform provider to participate in this project, we provide the bottom of the development platform, system integrators on this basis for two times deve

typeSyntax:Identifier [constant] datatype [not null] [: = | default expr]Identifier: Specifies the variable or constant name.Constant: a constant.Datatype: used to specify the type of a variable or constantNot NULL: non-null. It must be initialized.:=: The value assignment matchesDefault: Default ValueExpr: Initial Value 1.3. scalar definition rulesDeclare a variable per lineVariable Value assignment: identifier: = value;Variable names can contain up to 30 characters 1.4 Use the % Type attribut

rownumObviously, this writing will result in reading the table first, then sorting, and then taking the first 5 records, the plan is as follows:If we write like this, the semantics are the same, but it saves a lot of reading and sorting costs:Select/*+ Index (T1,IDX1_T1) */* from T1 where rownumThe execution plan for this SQL is as follows:As you can see, the SQL does not follow the hint instructions and s

1.DownloadInstantclient_11_2.zipPL/SQL2.Unzip the instantclient_11_2.zip to the appropriate folder,For example: E:\oracleclient\instantclient_11_2,--------------------------------------------------------------------------------Write a Sqlnet.ora file under this folderContent:NAMES. Directory_path= (TNSNames)Sqlnet. Authentication_services= (NTS)--------------------------------------------------------------------------------Then create a network/admin-level folder underneath the directory,For exa

, Microseconds_per_second ms_per_sec, pct_of_time pct from Opsg_delta_report where Microseconds_per_second > 0; Monitoring the usage of indexes: With In_plan_objects as(SELECT DISTINCT object_name from V$sql_plan WHERE object_owner = ' SCOTT ')SELECT table_name,Index_name,CaseWhen object_name was NULL then' NO 'ELSE' YES 'END as In_cached_planFrom User_indexesLeft OUTER JOIN in_plan_objectsOn (index_name = object_name);4. Identify the SQL st

by Binary_integer; --Defines a PL/SQL table type named mytable; the field type is pl/SQL record type; n Number:=1; tab_1 mytable; --instantiate a Tab_1 object for the mytable type; BEGIN--Assign Value forIinchc_1 Loop tab_1 (n). Empno:=I.empno; Tab_1 (n). ename:=I.ename; Tab_1 (N). Job:=I.job; Tab_

1. stored Procedures, functions, and triggers are all written in plsql. the process, function, and trigger are in the Oracle database. plsql is a very powerful database process Language 4. stored Procedures and functions can be used to call more Oracle Data in Java. video tutorial: 2.taobao.comitem.htm? Id42922011874spm686.1000925.0 1. stored Procedures, functions, and triggers are written in

ObjectiveAn index is one of the most important objects in a relational database and can significantly reduce the consumption of disk I/O and logical reads to improve the lookup performance of a SELECT statement. But it is a double-edged sword, and improper use can affect performance: He needs extra controls to hold the index information, and when the data is updated, it takes some extra overhead to keep the

I uninstalled PL/SQL Developer and compared it with Toad for Oracle. Previously, PL/SQL Developer was used to manage Oracle, which was inconvenient to use. It is very difficult to open, and there is always an extra box in the upp

If an online e-commerce system, we now need to be based on the order form reflected in the consumption of the customer simply divided into three categories of large and small and inserted into three tables. Order Form orders (order_id number, cust_id number, amount number); Small Customer table Small_cust (cust_id number, tot_amt number); Customer table Med_cust (cust_id number, tot_amt number); Large Customer table Big_cust (cust_id number, tot_amt number); If the total consumption amount

existing event classes are displayed on the right. For performance optimization, we do not need security review or session information. Click the delete button: Switch to the third tab page, and the data column here is enough by default. Of course, if you are not pleasing to the eye, you can delete the appname/NT username and so on. On the last tab page, we need to block the event ID generated by the system: Check the excluded System ID, for examp

From the design of the Oracle shared pool and the PL/SQL writing method recommended by Oracle, we can see that variable binding has a great impact on performance, how to bind variables in PL/S