The operating principle and architecture of the Informix database

Informix database is a relational database management system (RDBMS), which is widely used in enterprise -level applications and data warehouse environments.It has the characteristics of powerful functions and high performance, so it is favored by all walks of life.This article will focus on the operating principle and architecture of the Informix database, and explain related programming code and configuration when necessary. The operating principle of the Informix database can be summarized as the following aspects: 1. Database server architecture: Informix database uses client/server architecture, where the database server is the core component.The client communicates through the network and the database server, sends SQL statements and obtains results.The database server is responsible for the analysis of SQL statements, data storage and transaction management. 2. Physical storage structure: Informix database uses a variety of files and data structures to support data storage and access.Database files include log files (LOG), data files (DBSPACE), and temporary files.Data files store the actual data of tables, indexes and other database objects. 3. Logical storage structure: Informix database data uses logical structure organization data such as tables, indexes and views.The table is the basic unit of storage data. Each table contains a set of columns, and columns define the specific data type stored in the table.Index can improve query performance and accelerate the search process of data.The view is a virtual table, which is generated by one or more basic tables. 4. Affairs management: Informix database uses logs to record the operation of the database and supports the ACID attributes (atomic, consistency, isolation and persistence) of the transaction.Affairs is a logical unit of a series of database operations, either successfully executed or rolled back.The log file records the beginning, submission and rollback of transactions to ensure the consistency and persistence of the affairs. The above is the basic operating principle and architecture of the Informix database.If you need to know more detailed information, the following is a typical Informix database programming code example, and related configuration instructions: 1. Programming code example (Python language): python import informixdb # Database connection configuration conn = informixdb.connect(database='mydb', user='myuser', password='mypassword') cursor = conn.cursor() # 查 SQL query cursor.execute('SELECT * FROM mytable') # Get the query results result_set = cursor.fetchall() for row in result_set: print(row) # Close database connection cursor.close() conn.close() 2. Related configuration description: In the above code example, the parameters of the database connection are configured, including the database name (DataBase), username (user) and passwords.Modify the values of these parameters according to the actual situation to connect to the correct database. In addition, the Informix database driver (such as InformixDB) and related dependencies need to be installed to use the Informix database in the Python environment.Please select the appropriate driver and version according to the specific situation, and install and configure it in accordance with its instructions. In summary, the operating principle and architecture of the Informix database covers the database server architecture, physical storage structure, logical storage structure and transaction management.Understanding these principles and architecture can help developers better understand and apply Informix database.Through programming code examples and related configuration descriptions, you can quickly start using the Informix database for development.