Oracle

1. Data Recovery Advisor (DRA) Description 1.1 DRA description DRA automatically collects data fault information when an error occurs. In addition, it can check faults in advance. In this mode, it can detect and analyze data faults before the

-Add a temporary Column Alter table tablename add filedname_temp number (2 ); -Leave the value of the temporary column empty. Update zyt set id_temp = null; ----- # alter table tablename modify filedname null; -The field value to be updated is

Event Waits Time (s) Avg wait (MS) % DB time Wait Class Read by other session 4,914,569 9,98

In ORACLE, recursive is sometimes called a Virtual Private Database (VPD) or a fine-grained access control (FGAC ). With this feature, we can define a security policy (and specify the type of operation on the table) to restrict data that can be

Syntax for adding fields: alter table tablename add (column datatype [default value] [null/not null],...); Alter table tablename modify (column datatype [default value] [null/not null],...); Syntax for deleting a field: alter table tablename drop

This article will introduce some functions in Oracle that are similar to SQL Server ISNULL functions. Due to project requirements, you need to convert SqlServer to Oracle. Some Views in SqlServer use the ISNULL function. After finding out, the

I don't know much about oracle. Today, a friend said that oracle creates a job. I thought it was a job. As a result, oracle creates a job, let me introduce how to create a job instance in oracle. I. Simple Test of the job creation process case:1.

Data Warehouses are often filled with multiple data source systems, and each system runs its own applications. Therefore, in order to provide only new data to the data warehouse, it is very complicated to determine which rows are updated recently.

VB. NET is still quite common, So I studied the VB. NET transmission tablespace. Here I will share it with you, hoping it will be useful to you. Two databases (ltdb and epras). The tsts tablespace user ts (including two data files) is exported from

In Oracle 10 Gb system management, there is an automatic SGA memory management ASMM ). This function is described as follows: To use automatic management, you need to set the parameters SGA_TARGET, STATISTICS_LEVEL = TYPICAL or ALL. Because the

I like the VB. net undo tablespace very much. In my work, I also like to sum up the experience and lessons on the VB. NET UNDO tablespace. Let's talk about this in detail. Create a VB. net undo tablespace. The VB. net undo tablespace is used to

Before giving you a detailed description of Oracle free data blocks, let's first let you know the data stored in the rollback segment, and then give a comprehensive introduction to Oracle free data blocks, hoping to be useful to everyone. Here we

Oracle is still quite common, So I studied Oracle Rdbms and shared it with you here. I hope it will be useful to you. This is just to lay some foundation for future security, because we will use them later. Haha ~! 1. components contained in Oracle:

In the Oracle function to_char to convert the number type to specify the number of digits of the corresponding decimal point, we need to use the relevant functions to convert the numeric or date type to the numeric type, the following is a detailed

The following articles mainly describe the Common commands of Oracle DBA through the code of the actual application. If you are a beginner in Oracle DBA, you can use the following articles to understand the specific operations or related functions.

The following articles mainly introduce the Oracle insert escape characters, single quotation marks and & characters. If you think their names are weird, in addition, if they are rarely involved in practical applications, the following articles will

This article mainly describes how to greatly improve the performance of Oracle JDBC programs by using the connection and statement pool features. We generally use pool technologies, such as connection pool and statement pool, to significantly

The following articles mainly introduce Oracle Database External Identity Authentication research. If you are interested in understanding the actual operations related to Oracle Database External Identity Authentication research, the following

The following articles mainly describe some things worth your attention when porting Oracle to MySQL, including the case sensitivity differences, the differences between reserved words and data types are described below. The database used by the

We all know that the main function of Oracle data guard is disaster tolerance. We all know that data guard has the following features: high availability, performance improvement, DATA protection, and fault recovery. Oracle data guard can be divided