Oracle
Oracle Expert Tuning Secrets
Objective
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
Some of the most commonly used SQL statement syntax for the triple compilation. Need a friend to come over to refer to the next
I. Data Control statement (DML) section
1.INSERT (Insert the statement into the data sheet)
INSERT into table name
SQL Syntax | crash
First, SQL crash
Structure Query Language (SQL) is a standard language used to query relational databases, which includes several keywords and consistent syntax to facilitate the establishment and manipulation of database
MySQL Migration Support
At the beginning of 2007, IBM Migration Toolkit 2.0.2.0 (MTK) implemented limited support for migrating from MySQL 4.x and 5.x to DB2 and Informix Dynamic Server (IDS) targets. The subsequent MTK version improved the initial
oracle| Data | database
1. Analyze table Mzbs.db_code estimate STATISTICS SAMPLE PERCENT;
2. Table space Management and user management
--View table spaces and data files
Select file_name,tablespace_name,autoextensible from
One, the spy of the binding variable (PEEK)
1, Oracle in the processing of SQL with binding variables, only in hard parsing will "pry" the value of the binding variable in SQL, and then based on the value of the detected to determine the entire SQL
Error | resolution
Received a notice from developers and business personnel that a landing page could not be used, the error:
2005-01-31 13:59:02,721 [com.aspire.common.dao.oamuserdao]- -214:select Error
java.sql.sqlexception:ora-01502 State
This
As data volumes grow at an alarming rate, the database management system continues to focus on performance issues. This paper mainly introduces a performance tuning technique named function index (functional index). Creating and using functional
To use transactions in MySQL, you first need to create a table that uses a transaction table type, such as BDB = Berkeley db or InnoDB.
CREATE TABLE account ( account_id BIGINT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT, balance DOUBLE ) TYPE =
System Requirements AnalysisPostgraduate Personal information ManagementMentor Information ManagementProfessional information ManagementFunctional module DesignFor the above requirements, the design of the functional modules as shown in Figure 10.34.
Platform: Windows SP3 server
Database: Oracle 9.0.1.1.1
Site Description: Users complain that not multiple units at the same time data processing, the implementation of the error message is:
sql> exec sp_hyb_da_ryxx_dwbh_test (' 331028 ')
BEGIN
This paper mainly describes how to accelerate the Dynamic Web site MySQL index analysis and optimization.
One, what is an index?
Indexes are used to quickly look for records with a specific value, and all MySQL indexes are saved as a B-tree. Without
A partitioned index is a separate index on all of the zones, which is automatically maintained, which does not affect the use of other partitioned indexes of the index when a drop or truncate a partition, that is, the index does not fail, is easier
First, SQL crash
Here are some important SQL quick references, for SQL syntax and added features on standard SQL, please check the MySQL manual.
1. Create a table
A table is one of the most basic elements of a database, and can be independent of
oracle| Index
The descending index is essentially the FBI, and its specific definition can be queried by user_ind_expressions or dba_ind_expressions.
Similarly, a descending index can be used only under the CBO.
Connected to oracle9i Enterprise
1. Create partitions on a monthly basis
CREATE TABLE T_MHDP
(
ID VARCHAR2 NOT NULL,
Flt_aircode VARCHAR2 (4),
Flt_number Number (7),
Flt_date DATE
) partition by range (flt_date)
(
Partition PART201105 values less than (To_date (' 2011-06-01
server| Create | Stored procedure stored procedures can make it much easier to manage the database and to display information about the database and its users. Stored procedures are precompiled collections of SQL statements and optional control flow
Effects of skip_unusable_indexes parameters on invisible indexes
How the database handles the unavailable indexes is mainly determined by the parameter skip_unusable_indexes;
If the parameter is set to True, the database encounters an unavailable
--Statement function
--Data manipulation
SELECT-Retrieve rows and columns of data from a database table
INSERT-Add new data rows to a database table
Delete-Deletes rows of data from a database table
Update--updating data in a database table
--Data
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