What are typical bottlenecks in Blue/green databases and how to remove them?

    // Example of a simple blue/green deployment process for a database
    function deployBlueGreen($currentVersion, $newVersion) {
        // Step 1: Create a new database version (Green)
        createDatabaseVersion($newVersion);

        // Step 2: Migrate data from Blue to Green
        migrateData($currentVersion, $newVersion);

        // Step 3: Switch the traffic to the Green database
        switchTrafficTo($newVersion);

        // Step 4: Decommission the old Blue database after validation
        if (validateDeployment($newVersion)) {
            decommissionDatabase($currentVersion);
        }
    }

    // Function stub for creating a database version
    function createDatabaseVersion($version) {
        // Logic to create a new DB version
    }

    // Function stub for migrating data
    function migrateData($fromVersion, $toVersion) {
        // Logic to migrate data
    }

    // Function stub for switching traffic
    function switchTrafficTo($version) {
        // Logic to switch traffic to the new DB version
    }

    // Function stub for validating deployment
    function validateDeployment($version) {
        // Logic to validate the new DB version
        return true; // Assume validation is successful
    }

    // Function stub for decommissioning the old database
    function decommissionDatabase($version) {
        // Logic to decommission the old DB version
    }