Label:11g new Features-automatic SQL tuning (Automatic SQL Tuning) In Oracle 10g, an automatic SQL Tuning feature was introduced. In addition, ADDM monitors
Oracle SQL advanced programming learning notes (I) Core SQL statement 1, select statement execution sequence
5 SELECT
(1) first execute the clause or link clause after the From clause to query the initial dataset. (2) execute the where clause to streamline the initial result set, query the dataset that meets the whe
Oracle BASICS (5) Advanced pl/SQL (paging process)Compile the paging process to implement the paging process through pl/SQL, and then step by step from simple to difficult. The purpose is to familiarize yourself with the various stored procedures, packages, and cursors of pl/SQL
in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think that using this tool is only suitable for people who don't understa
Advanced query and difficulties of Oracle and Mysql SQLMysql query Yang Kai exclusive Channel OracleSQL 1. Connection query 1. Internal Connection is used to return all records that meet the connection conditions. By default, if no join operator is specified during connection query execution, these join queries belong to internal connections. SQL code 1. SELECT.
inversion function, which indicates that I is descending from 10 to 1, and removing reverse indicates that I increment from 1 to 10 INSERT into USERS VALUES (I, ' shunping '); END LOOP;END;/--Call the stored procedureEXEC Sp_pro6; We can see the control variable I, which is continuously increasing in the implication. Six, sequential control statements –goto, NULL1), goto statementThe goto statement is used to jump to a specific symbol to execute a statement. Note Because the use of GOTO s
Tags: Operator arithmetic operators: +-*/You can use the Join operator in a SELECT statement: | | select deptno| | Dname from dept; comparison operator:> >= =! = Oracle Add Field Syntax: The syntax for adding a field: ALTER TABLE tablename Add (column datatype [default value][null/not null],....); @ Modify the syntax of the field: ALTER TABLE tablename modify (column datatype [default value][null/not null],....); @ Delete field syntax: ALTER TABLE
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
Pq_distribute hints are often used to improve the performance of connection operations between partitioned tables in the Data Warehouse. The Pq_distribute hint allows you to determine how table data rows participating in a connection are allocated between production and consumption parallel query service processes. Pq_distribute prompt accepts three parameters: table name, outer allocation, and internal allocation.When parallel query connections are performed, we always try to avoid parallel_to_
in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think the use of such tools, only for the people who do not understand the
Tags: style blog http io ar os SP data onThere is a connect by clause in Oracle. is used for hierarchical queries. is a recursive query. Where the syntax is as follows:SELECT ... From notes:1. CONDITIONAL-1 Condition: The filter condition in SQL,2.conditional-2 condition: Is the definitive statement of the root node, and the condition from which to start.3. CONDITIONAL-3 conditions: Is the connection condit
) A. Need to display the account opening date under each customer account B. Need to display the date on which the customer placed the order C. Need to display all orders placed on a specific date D. Need to display all orders with the same release date as the order numbered 25950 8. Which of the following SELECT statements should be used if you want to display the product names in the report that cost values are higher than the average cost of all products? (B) A. Select Product name from produ
tuning rules that every Oracle DBA should follow
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through
First, diagnostic tools
1. Warning Log file
Warning log files contain system information and error logs that contain important errors (such as: ORA-600) and block checksum error messages (ora-1578,ora-1498). Monitor database operations such as CREATE DATABASE, STARTUP, SHUTDOWN, ARCHIVE log, and RECOVER, and record Non-default initialization parameter values. When Log_checkpionts_to_alert is set to true, the warning log file also records the start and end times of checkpoints, incomplete checkpo
Tags: Star ref note + + limit base min ant into1, Preface: SQL Tuning has been the DBA of the more laborious technology, and many DBAs if not engaged in the development of the work, then tuning is a headache work, even if the SQL tuning is a strong master, in the process of
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
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