advanced oracle sql tuning

DBMS_SPM packageLoad_plan_from_cursor_cache process or load_plan_from_sqlset process to migrate itto the SQL plan baseline. When the migration is complete, you should disable or delete the original storage outline. Possible SQL Plan manageability Scenarios What are the possible SQL plan manageability scenarios? Database Upgrade: When you upgrade a

than the published book of its kind. The whole book is driven by a comprehensive human resources project, not only can the various theoretical knowledge points well into practice, but also allow the reader to experience the complete process of the project, "explaining more practice" is also an important feature of the books, to ensure that the reader can really learn. Of course, the most important thing is the content itself, the book first on the theoretical basis of PL/

if not yet.4, sometimes may appear the client to the Chinese support bad question, may refer to the following third article environment variable setting:On the desktop, right-click My Computer, select Properties, select Environment variables in the Advanced page, and in the system variables, increase:1) variable name: oracle_homeVariable Value: E:\instantclient_11_22) variable name: tns_adminVariable Value: E:\instantclient_11_23) variable name: Nls_

('language') nls_lang from dual;NLS_LANG----------------------------------------------------SIMPLIFIED CHINESE_CHINA.ZHS16GBKRight-click "computer"-"properties"-"Advanced System settings"-"environment variables"-"system environment variables ":1>. Select "Path"-click "edit" to add "D: \ oracle \ product \ instantclient_12_1;2>. Click "new", set the variable name to "TNS_ADMIN", set the variable value to "D

Oracle and Microsoft are two major database products in the history of database development. This leaves little room for selection of databases, either Microsoft or Oracle. However, there is a big difference between them. When selecting databases, we have to pay attention to the three small differences between them. Understanding these differences can provide great guidance for database selection. I. Differ

their definition does not paste and be changed. Contention for a latch increases the execution time of the statement and reduces concurrency. Soft parsing any ill-resolved parsing isSoft parsing。 If you submit a statement that is the same as a reusable SQL statement in a shared type, the database reuses that existing code. Reuse code is also known asLibrary Cache Hit。 General, soft parsing is preferable to hard parsing because the database can

Summary of Oracle SQL Execution Plan and Analysis Oracle has multiple ways to obtain a query plan for an SQL statement, such as using the explain plan command and pressing the F5 shortcut in PLSQL Developer. However, it is easier to use it for SQL optimization, use the set a

Tags: PL/SQL developer do not install client connection to remote Oracle databasePL/SQL Developer is an integrated development environment designed specifically for the development of Oracle Database storage program units. Now that more and more business logic and application logic has shifted to

variables) for nls_lang environment variables, it is best to set to the same as the database side, first query the character set information from the database side: Sql> Select Userenv (' language ') Nls_lang from dual; Right-click My Computer-Properties-advanced-environment variables-system environment variables: 1> Select "Path"-click "Edit" toAdd "D:\app\min\product\11.2.0;" 2> Click " new", t

path and tns_admin environment variables)For Nls_lang environment variables, it is best to set to the same as the database side, first query the character set information from the database side:Sql> Select Userenv (' language ') Nls_lang from dual;Nls_lang----------------------------------------------------Simplified Chinese_china. Zhs16gbkRight-click My Computer-Properties-advanced-environment variables-system environment variables:1> Select "Path"-

Software environment: 64-bit win7, 32-bit Oracle 10g, PL/SQL 9.0.4.1644 In the past, 32-bit systems were used for development and suddenly switched to 64-bit systems. The installation environment was a little troublesome, especially for PL/SQL, which only supported 32-bit systems. I read a lot of materials, but some problems cannot be solved directly. It took a d

With SPA, you can play a specific stream based on various types of changes (such as initialization parameter changes, optimizer statistics refresh, and database upgrades)SQL or the entire SQL load, and then generate a comparison report to help you evaluate their impact. In versions earlier than Oracle Database 11g, I must capture all