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This article mainly introduces "how PHP drives MongoDB". In daily operation, I believe many people have doubts about how PHP drives MongoDB. Xiaobian consulted all kinds of information and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how PHP drives MongoDB"! Next, please follow the small series to learn together!

MongoDB is a database written in C++ and based on distributed file storage. MongoDB is a product between relational database and non-relational database, which is the most feature-rich and most like relational database.

When establishing a connection to the mongodb replication set, the driver first attempts to connect and verify each non-hidden node in the cluster. If a node is in a "down" state, it is skipped.

Creating an index can sometimes block new connections

However, if a node is in the "UP" state but holds a write lock, validation will not proceed and the driver will be suspended.

Before mongodb version 2.6, a common bug in indexing. All indexes are created in the foreground or background, and on the secondary side will be created in the foreground.

An improvement in PHP driver version 1.5.3 allows validation to the second node when creating an index.

Decrease is_master_interval value

For applications with high availability requirements, it is recommended that you check the default driver runtime configuration settings.

The mongo.is_master_interval option controls how quickly the driver recovers when a replica set is re-elected.

The is_master_interval option defaults to 15s, which sets the time interval at which the driver sends "isMaster" requests for each mongod instance. These requests help the driver determine the topology of the replication set, specifically the request to detect which node is primary and can receive writes.

It is recommended that this value be set to 1 or 2 seconds to allow the driver to quickly locate the primary node in the event of a cluster election or failover. Of course, this also depends on how many clients there are and how often the pings occur.

Note that when a primary node changes, such as an election or failover, there are always a few seconds when the driver receives a "MongoConnectionException" message "No candidate servers found." These exceptions need to be handled in your code, otherwise the application will terminate.

Understand how connections are handled and configure connection TimeoutMS

PHP drivers do not use connection pools. Therefore, it is recommended that you create one connection per PHP process. However, if the web application has many PHP worker processes, many new database connections will be created, and PHP drivers cannot share connections between processes. As a result, PHP applications are particularly vulnerable to getting stuck creating initial database connections when network nodes are slow and servers are busy.

In this case, it is recommended that you customize the connectionTimeoutMS option and note the mongo.ping_interval option in php.ini.

connectionTimeoutMS

PHP drivers don't show a default connection timeout defined. Instead, the default value is determined by the default_socket_timeout option in the php.ini file, which defaults to 60 seconds. The connection will wait 60 seconds for disconnection, which is a bit long and needs to be reduced.

It is strongly recommended to set the connectionTimeoutMS option by displaying it in the URI option of the connection string. Set it to a value between 5 and 30 seconds.

mongo.ping_interval

mongo.ping_interval The default is 5 seconds. This option sets the interval at which the driver sends ping requests to each mongod instance to discover "down" nodes, which is used to track the driver's server blacklist. Tells the driver which nodes to ignore.

At this point, the study of "how PHP drives MongoDB" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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