云服务器和数据库要分开买吗

import tencentcloud.common.credentials
import tencentcloud.common.profile.client_profile
import tencentcloud.common.profile.http_profile
import tencentcloud.cvm.v20170312.cvm_client
import tencentcloud.cdb.v20170320.cdb_client

# 创建云服务器
def create_cvm():
    cred = tencentcloud.common.credentials.Credentials("YOUR_SECRET_ID", "YOUR_SECRET_KEY")
    httpProfile = tencentcloud.common.profile.http_profile.HttpProfile()
    httpProfile.endpoint = "cvm.tencentcloudapi.com"
    clientProfile = tencentcloud.common.profile.client_profile.ClientProfile()
    clientProfile.httpProfile = httpProfile
    client = tencentcloud.cvm.v20170312.cvm_client.CvmClient(cred, "ap-guangzhou", clientProfile)
    
    request = tencentcloud.cvm.v20170312.models.RunInstancesRequest()
    request.ImageId = "img-xxxxxx"
    request.InstanceType = "S2.SMALL1"
    request.InstanceChargeType = "POSTPAID_BY_HOUR"
    request.InstanceName = "MyInstance"
    
    response = client.RunInstances(request)
    return response

# 创建数据库
def create_cdb():
    cred = tencentcloud.common.credentials.Credentials("YOUR_SECRET_ID", "YOUR_SECRET_KEY")
    httpProfile = tencentcloud.common.profile.http_profile.HttpProfile()
    httpProfile.endpoint = "cdb.tencentcloudapi.com"
    clientProfile = tencentcloud.common.profile.client_profile.ClientProfile()
    clientProfile.httpProfile = httpProfile
    client = tencentcloud.cdb.v20170320.cdb_client.CdbClient(cred, "ap-guangzhou", clientProfile)
    
    request = tencentcloud.cdb.v20170320.models.CreateDBInstancesRequest()
    request.InstanceName = "MyDBInstance"
    request.Engine = "mysql"
    request.InstanceType = "S1.SMALL"
    
    response = client.CreateDBInstances(request)
    return response

# 调用示例
create_cvm()
create_cdb()