How to implement master-slave replication in Oracle database with PHP

With the continuous development of Internet applications, the stability and performance requirements of the database are getting higher and higher. In order to ensure the high availability and data security of the database, database master-slave replication has become a relatively common solution. In this article, we will introduce how to use PHP to implement master-slave replication of Oracle database.

1. Introduction to master-slave replication

Database master-slave replication refers to copying data on one database (master database) to multiple other databases (slave databases) to achieve load Balancing, data backup and fault tolerance functions. In master-slave replication, the master database records its own update operations and then transmits them to the slave database for execution so that the slave database is consistent with the master database.

2. PHP implements master-slave replication of Oracle database

In PHP, we can use the OCI8 extension to access the Oracle database. The OCI8 extension provides functions such as Oracle database connection, query, and transaction processing, and can be used to implement database master-slave replication. The following are the basic steps to implement master-slave replication in Oracle database:

1. Create the connection between the master database and the slave database

Use the OCI8 extension function ocilogon() to create the master database and slave database Database connection parameters include database IP address, user name, password and other information.

2. Set the slave database to read-only mode

Use the OCI8 extension functions ociparse() and ociexecute() to execute the following SQL statement:

ALTER DATABASE OPEN READ ONLY;

Set the slave database to read-only mode to prevent the slave database and the master database from being modified at the same time.

3. Enable logging on the main database

Use the OCI8 extension functions ociparse() and ociexecute() to execute the following SQL statement:

ALTER SYSTEM SWITCH LOGFILE ;

Enable the log on the primary database to transmit update operations to the secondary database.

4. Perform update operations in the main database

Use the OCI8 extension functions ociparse() and ociexecute() to execute SQL statements that need to update data, and the main database will record these operations into the log file.

5. Perform update operations on the slave database

Use the OCI8 extension functions ociparse() and ociexecute() on the slave database to perform subsequent update operations. The slave database will update the data from the master database. Obtain the update operation from the log file of the database and execute it to make the slave database consistent with the master database.

6. Close the database connection

Use the OCI8 extension function ocilogoff() to close the open database connection and release related resources.

3. Summary

Using PHP to implement master-slave replication of Oracle database can effectively improve the availability of the database and data backup efficiency, and avoid the risk of single point of failure. During the implementation process, attention needs to be paid to issues such as database settings and frequency of update operations to ensure the stability and performance of the entire system. I hope this article can provide you with some ideas and methods about using PHP to implement master-slave replication in Oracle database.

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