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2 changes: 2 additions & 0 deletions releases/v20.1.0.md
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summary: Additions and changes in CockroachDB version v20.1.0.
---

<iframe width="560" height="315" src="https://youtu.be/c6YxSeOa9AU" frameborder="0" allowfullscreen></iframe>

## May 12, 2020

With the release of CockroachDB v20.1, we've made a variety of productivity, performance, and security improvements. Check out a comprehensive [summary of the most significant user-facing changes](#summary) and then [upgrade to CockroachDB v20.1](../v20.1/upgrade-cockroach-version.html). You can also read more about these changes in the [v20.1 blog post](https://www.cockroachlabs.com/blog/cockroachdb-20-1-release/) or [watch our 20.1 release demo and overview](https://www.cockroachlabs.com/webinars/introducing-cockroachdb-20-1-build-fast-and-build-to-last/).
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4 changes: 4 additions & 0 deletions v20.1/alter-primary-key.md
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<span class="version-tag">New in v20.1:</span> The `ALTER PRIMARY KEY` [statement](sql-statements.html) is a subcommand of [`ALTER TABLE`](alter-table.html) that can be used to change the [primary key](primary-key.html) of a table.

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/MPx-LXY2D-c" frameborder="0" allowfullscreen></iframe>

## Details

- You cannot change the primary key of a table that is currently undergoing a primary key change, or any other [schema change](online-schema-changes.html).
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4 changes: 4 additions & 0 deletions v20.1/backup-and-restore.md
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Based on your [license type](https://www.cockroachlabs.com/pricing/), CockroachDB offers two methods to backup and restore your cluster's data: [Enterprise](#perform-enterprise-backup-and-restore) and [Core](#perform-core-backup-and-restore).

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/RGuya_SYfY8" frameborder="0" allowfullscreen></iframe>

## Perform Enterprise backup and restore

If you have an [Enterprise license](enterprise-licensing.html), you can use the [`BACKUP`][backup] statement to efficiently back up your cluster's schemas and data to popular cloud services such as AWS S3, Google Cloud Storage, or NFS, and the [`RESTORE`][restore] statement to efficiently restore schema and data as necessary.
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4 changes: 4 additions & 0 deletions v20.1/flyway.md
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This page walks you through a series of simple database schema changes using Flyway, an open-source schema migration tool. For detailed information about using Flyway, see the [Flyway documentation site](https://flywaydb.org/documentation/).

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/xz4j5tU0ZRU" frameborder="0" allowfullscreen></iframe>

## Before You Begin

Before you begin, do the following:
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4 changes: 4 additions & 0 deletions v20.1/follower-reads.md
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This is an [enterprise feature](enterprise-licensing.html).
{{site.data.alerts.end}}

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/V--skgN_JMo" frameborder="0" allowfullscreen></iframe>

## How follower reads work

Each CockroachDB node tracks a property called its "closed timestamp", which means that no new writes can ever be introduced below that timestamp. The closed timestamp advances forward by some target interval behind the current time. If the replica receives a write at a timestamp less than its closed timestamp, it rejects the write.
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4 changes: 4 additions & 0 deletions v20.2/alter-primary-key.md
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The `ALTER PRIMARY KEY` [statement](sql-statements.html) is a subcommand of [`ALTER TABLE`](alter-table.html) that can be used to change the [primary key](primary-key.html) of a table.

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/MPx-LXY2D-c" frameborder="0" allowfullscreen></iframe>

## Details

- You cannot change the primary key of a table that is currently undergoing a primary key change, or any other [schema change](online-schema-changes.html).
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4 changes: 4 additions & 0 deletions v20.2/backup-and-restore.md
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Expand Up @@ -11,6 +11,10 @@ Because CockroachDB is designed with high fault tolerance, backups are primarily

Based on your [license type](https://www.cockroachlabs.com/pricing/), CockroachDB offers two methods to backup and restore your cluster's data: [Enterprise](#perform-enterprise-backup-and-restore) and [Core](#perform-core-backup-and-restore).

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/RGuya_SYfY8" frameborder="0" allowfullscreen></iframe>

## Perform Enterprise backup and restore

If you have an [Enterprise license](enterprise-licensing.html), you can use the [`BACKUP`][backup] statement to efficiently back up your cluster's schemas and data to popular cloud services such as AWS S3, Google Cloud Storage, or NFS, and the [`RESTORE`][restore] statement to efficiently restore schema and data as necessary.
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4 changes: 4 additions & 0 deletions v20.2/flyway.md
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This page walks you through a series of simple database schema changes using Flyway, an open-source schema migration tool. For detailed information about using Flyway, see the [Flyway documentation site](https://flywaydb.org/documentation/).

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/xz4j5tU0ZRU" frameborder="0" allowfullscreen></iframe>

## Before You Begin

Before you begin, do the following:
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4 changes: 4 additions & 0 deletions v20.2/follower-reads.md
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Expand Up @@ -16,6 +16,10 @@ For instructions showing how to use follower reads to get low latency, historica
This is an [enterprise feature](enterprise-licensing.html).
{{site.data.alerts.end}}

## Watch the demo

<iframe width="560" height="315" src="https://youtu.be/V--skgN_JMo" frameborder="0" allowfullscreen></iframe>

## How follower reads work

Each CockroachDB node tracks a property called its "closed timestamp", which means that no new writes can ever be introduced below that timestamp. The closed timestamp advances forward by some target interval behind the current time. If the replica receives a write at a timestamp less than its closed timestamp, it rejects the write.
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