With drift, you can declare your database tables and queries in pure Dart without having to miss out on advanced SQL features. Drift will take care of creating the tables and generate code that allows you run fluent queries on your data.

A well-chosen SQL schema enables type-safe queries and avoids hard-to-spot mistakes. Thanks to drift's extensive support for schema migrations, changing schemas is a safe and easy process. Further, drift provides a complete test toolkit to help you test migrations between all your revisions.


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Drift ships a powerful SQL parser and analyzer, allowing it to create type-safe methods for all your SQL queries. All SQL queries are validated and analyzed during build-time, so drift can provide hints about potential errors quickly and generate efficient mapping code. Of course, you can mix SQL and Dart to your liking.

Drift provides auto-updating streams for all your queries, makes dealing with transactions and migrations easy and lets your write modular database code with DAOs. When using drift, working with databases in Dart is fun!

Even as you manage your resources through CloudFormation, users can change those resources outside of CloudFormation. Users can edit resources directly by using the underlying service that created the resource. For example, you can use the Amazon EC2 console to update a server instance that was created as part of a CloudFormation stack. Some changes may be accidental, and some may be made intentionally to respond to time-sensitive operational events. Regardless, changes made outside of CloudFormation can complicate stack update or deletion operations. You can use drift detection to identify stack resources to which configuration changes have been made outside of CloudFormation management. You can then take corrective action so that your stack resources are again in sync with their definitions in the stack template, such as updating the drifted resources directly so that they agree with their template definition. Resolving drift helps to ensure configuration consistency and successful stack operations.

Drift detection enables you to detect whether a stack's actual configuration differs, or has drifted, from its expected configuration. Use CloudFormation to detect drift on an entire stack, or on individual resources within the stack. A resource is considered to have drifted if any of its actual property values differ from the expected property values. This includes if the property or resource has been deleted. A stack is considered to have drifted if one or more of its resources have drifted.

To determine whether a resource has drifted, CloudFormation determines the expected resource property values, as defined in the stack template and any values specified as template parameters. CloudFormation then compares those expected values with the actual values of those resource properties as they currently exist in the stack. A resource is considered to have drifted if one or more of its properties have been deleted, or had their value changed.

CloudFormation detects drift on those AWS resources that support drift detection. Resources that don't support drift detection are assigned a drift status of NOT_CHECKED. For a list of AWS resources that support drift detection, see Resources that support import and drift detection operations.

In addition, CloudFormation supports drift detection on private resource types that are provisionable; that's, whose provisioning type is either FULLY_MUTABLE or IMMUTABLE. To perform drift detection on a resource of a private resource type, the default version of the resource type that you have registered in your account must be provisionable. For more information on resource provision type, see the ProvisioningType parameter of the DescribeType action in the AWS CloudFormation API Reference and of the DescribeType command in the AWS CLI Command Reference. For more information on private resources, see Using the CloudFormation registry.

When detecting drift on a stack, CloudFormation does not detect drift on any nested stacks that belong to that stack. Instead, you can initiate a drift detection operation directly on the nested stack.

CloudFormation only determines drift for property values that are explicitly set, either through the stack template or by specifying template parameters. This doesn't include default values for resource properties. To have CloudFormation track a resource property for purposes of determining drift, explicitly set the property value, even if you are setting it to the default value.

The current configuration of each supported resource matches its expected template configuration. A stack, stack set, or stack instance with no resources that support drift detection will also have a status of IN_SYNC.

Read permission for each resource that supports drift detection included in the stack. For example, if the stack includes an AWS::EC2::Instance resource, you must have ec2:DescribeInstances permission to perform drift detection on the stack.

In certain cases, objects contained in property arrays will be reported as drift, when in actuality they're default values supplied to the property from the underlying service responsible for the resource.

Certain resources have attachment relationships with related resources, such that a resource may actually attach or remove property values for another resource, defined in the same or another template. For example, the AWS::EC2::SecurityGroupIngress and AWS::EC2::SecurityGroupEgress resources may be used to attach and remove values from AWS::EC2::SecurityGroup resources. In these cases, CloudFormation analyses the stack template for attachments before performing the drift comparison. However, CloudFormation can't perform this analysis across stacks, and so may not return accurate drift results where resources that are attached reside in different stacks.

CloudFormation does not perform drift detection on the KMSKeyId property of any resources. Because AWS KMS keys can be referenced by multiple aliases, CloudFormation can't guarantee consistently accurate drift results for this property.

There are certain resource properties that you can specify in your stack template that, by their very nature, CloudFormation will not be able to compare to the properties in the resulting stack resources. These properties therefore cannot be included in drift detection results. Such properties fall into two broad categories:

For example, CloudFormation cannot map the source code of a Lambda function back to the Code property type of the Function resource, and therefore CloudFormation can't include it in drift detection results.

There are certain property values that, by design, are never returned by the service to which the resource belongs. These tend to contain confidential information, such as passwords or other sensitive data that shouldn't be exposed. For example, the IAM service will never return the value of the Password property of the IAM User LoginProfile property type, and therefore CloudFormation can't include it in drift detection results.

EPA is actively engaged in several initiatives to help minimize pesticide drift problems. Learn more about What EPA is Doing to Reduce Spray Drift. Learn more about what EPA is doing to reduce spray drift.

You may feel that you've drifted too far off course to get back. This is simply not true. It's never to late. You can harness the power of incremental change over time and get back on track faster than you think.

Pesticide drift is the airborne movement of pesticides from an area of application to any unintended site. Drift can happen during pesticide application, when droplets or dust travel away from the target site. It can also happen after the application, when some chemicals become vapors that can move off-site. Pesticide drift can cause accidental exposure to people, animals, plants and property.

You might think of pesticide drift as the movement of spray droplets during application. This is called 'particle drift.' But, some pesticides are more likely to drift in the form of vapor. This can happen after an application even when the pesticide was applied as a solid or liquid. This is called 'vapor drift,' and an important factor is the pesticide's vapor pressure.

Pesticide drift can pose health risks to people and pets when sprays and dusts drift to nearby areas such as homes, schools, and playgrounds. Wildlife and plants are also at risk when drift affects natural areas and water sources. Herbicide drift can damage other nearby crops or make them unsellable if the active ingredient is not registered for a particular crop. Pesticide drift also results in wasted pesticide product. EPA estimates up to 70 million pounds of pesticides are lost to drift each year.

Reading the label is the first and most important way to minimize risk and exposure. Understanding the approved use instructions will help reduce the risk of drift. There are four main drift factors the EPA focuses on when reviewing pesticide product registrations:

I have tried various connection tweaks (read-only intent, asynchronous processing, multiple active result sets) in the hopes that I can make the comparison run faster and update the project before the drift happens, but to no avail. I have also tried reducing the types of objects included in the comparison, but have not been able to reduce it enough to prevent drift from being detected.

I think the biggest issue I have is that aside from the "schema drift detected" message, I feel like I'm shooting in the dark. By that I mean that I have no idea what is causing SSDT to detect drift, and therefore I can't work around it.

I tried running the SQL Profiler to capture what SSDT is doing so I could find where SSDT is detecting drift. However, I haven't been able to find any query that gives different results when run multiple times within a short period.

I also struggled for months to find the cause of the same error. I was already thinking about flashing Windows 10 on my laptop. I won't list the dead ends anymore. In my final desperation, I copied the SQL Server database and VS project to another machine, and there the comparison worked without a bone. The suspicion arose that maybe the error is not in VS, but rather that my SQL server is confusing VS.I have a SQL Server 2012. I put the latest update on it (SP4) and wonder of wonders, compare and sync started working perfectly right away. Of course, now before every update I pray a little so that I don't encounter the "Source schema drift detected" message. 2351a5e196

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