Database Administrator

Python in Ubuntu accesses the Oracle database through the SQLAlchemy Library SQLAlchemy is not a database driver. The Python driver for accessing Oracle data is cx_Oracle, but this driver depends on Oracle instant client. Therefore, if you want to

How Does Oracle export system tables under sys users? Environment: Solaris 10 + Oracle 10.2.0.4 1. Export instances 2. References Reference 1. Export instances ExportHIST_HEAD$AndWRI$_OPTSTAT_HISTHEAD_HISTORYTwo tables:An error occurred while

[Speech Recording] RWP team talked about SQL optimization and recorded rwp team SQL Speaking of SQL optimization, what is the first reaction in your mind as a reader? Index? Hint? Partition? Parameter? Execution Plan? Haha, let's talk about it.

EXP is very different from the previous 10G and 9I versions when exporting a database of 11G, that is, tables without data will not allocate space. Since Oracle 11.2.0.1, Oracle provides a new space allocation method: when creating a non-partition

BKJIA quick translation] when I see this question, I don't think there is a definite answer! The reason is that SQL Server has jumped from a simple desktop-based application to an important enterprise-level database management system product, but it

In fact, when creating an object in the database, the Administrator must also name it. Some experienced database administrators will also be careful when naming them. It must be loud and representative of specific application scenarios. Sometimes

What should I do if SQL Server executes dynamic SQL statements? The following describes the two correct ways for SQL Server to execute dynamic SQL. We hope that you can have a better understanding of SQL Server to execute dynamic SQL. Dynamic SQL:

Although many GUI-based MySQL clients exist, such as the famous phpMyAdmin and SQLYog, I have always liked the native MySQL command line client. Indeed, I am not familiar with these command line interfaces (CLI) previously, it took us some time to

Preface Currently, all applications that use Oracle as the database support platform have a large amount of data, that is, the data volume of tables is generally more than one million data volume. Of course, creating partitions in Oracle is a good

For the UI Layer of an application that focuses on data processing, we often need to write a considerable amount of code to bind data. If some agreed ing relationships are stored between controls on the interface and entity types as data sources, we

DateTime is one of the most commonly used and problematic data types. The following problems exist: 1. DateTime Storage Format Before explaining the DateTime storage format, you must correct a concept. Components of the DateTime type: year, Month,

Editor's note:SET QUOTED_IDENTIFIER Make Microsoft®SQL Server™Follow the SQL-92 rules for the quotation mark separator and text string. The identifiers separated by double quotation marks can be keywords reserved by Transact-SQL, or can contain

Editor's note: when using SQL Server, a small error occurs in backup and database restoration. What should you do? Here are a few tricks. Let's take a look at them with the author! An unknown error occurred while backing up the database. the error

-- This test script can be run directly. -- Now we want to group and add data in the database by fixed fields. Five methods are summarized here. -- Create a test table and add Test Data create table test(id varchar2(10),mc varchar2(50));   

Some time ago, we encountered this problem when performing a batch data review or deletion function: Because the review or deletion operation is performed in the stored procedure, we plan to splice the primary key of the selected data into a string

1. EXPLAIN tbl_name EXPLAIN tbl_name is a synonym for DESCRIBE tbl_name or show columns from tbl_name. 2. EXPLAIN [EXTENDED] SELECT select_options If the keyword "EXPLAIN" is placed before the SELECT statement, MySQL will EXPLAIN how it processes

Currently, the following technologies or solutions are available for remote replication and Disaster Tolerance of oracle databases: (1) Disaster recovery replication solution based on the storage layer The replication mechanism of this technology is

In today's era of rapid development of information technology, users often encounter the problem of Switching Data in EXCEL files to data in ORACLE databases to achieve real-time data operations, there are not many materials available in this regard.

The Virtual Private Database feature of Oracle is also known as fine-grained access control. It provides row-level security checks for DML statements in data management languages such as SELECT. PL/SQL policy functions are associated with a data

Different enterprises may have different Personalized Requirements for databases. Such as the date display format. To meet the requirements of different enterprises in this regard, the concept of server variables is put forward in the MySQL database.