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 and then upgrade to CockroachDB v20.1. You can also read more about these changes in the v20.1 blog post or watch our 20.1 release demo and overview.
Get future release notes emailed to you:
$ docker pull cockroachdb/cockroach:v20.1.0
This section summarizes the most significant, user-facing changes in v20.1.0. For a complete list of features and changes, including bug fixes and performance improvements, see the release notes for previous testing releases.
- Core features
- Enterprise features
- Backward-incompatible changes
- Known limitations
You can now use the code
CRDB30for a free 30-day trial of CockroachCloud.
CockroachCloud pricing is now available on our website.
VPC peering is now supported for CockroachCloud clusters running on GCP. Contact us to set up a VPC peering-enabled CockroachCloud cluster.
These features are freely available in the core version and do not require an enterprise license.
|SQL||Online Primary Key Changes||The new
|SQL||Schema Change Controls||Online schema changes can now be paused, resumed, and cancelled via
|SQL||Foreign Key Improvements||CockroachDB now supports multiple foreign key constraints on a single column. Also, it's now possible to drop the index on foreign key columns, or on the referenced columns, if another index exists on the same columns and fulfills indexing requirements.|
|SQL||Nested Transactions and Savepoints||CockroachDB now supports the nesting of transactions using savepoints. These nested transactions, also known as sub-transactions, can be rolled back without discarding the state of the entire surrounding transaction. This can be useful in applications that abstract database access using an application development framework or ORM. Different components of the application can operate on different sub-transactions without having to know about each others' internal operations, while trusting that the database will maintain isolation between sub-transactions and preserve data integrity.|
|SQL||Hash-Sharded Indexes||For tables indexed on sequential keys, CockroachDB nows offers hash-sharded indexes to distribute sequential traffic uniformly across ranges, eliminating single-range hotspots and improving write performance on sequentially-keyed indexes at a small cost to read performance. This feature is currently experimental.|
|SQL||Slow Query Log||You can now enable a slow query log to record SQL queries whose service latency exceeds a specified threshold.|
|SQL||Recursive Common Table Expressions||CockroachDB now supports common table expressions that contain subqueries that refer to their own output.|
||CockroachDB now supports the
|SQL||Precision in Time Values||CockroachDB now supports precision levels from 0 (seconds) to 6 (microseconds) for
|SQL||Vectorized Execution Improvements||Vectorized execution now supports hash joins, merge joins, most window functions, as well as the
|SQL||Column Families in Secondary Indexes||Secondary indexes now respect the column family definitions applied to tables. When you define a secondary index, CockroachDB breaks the secondary index key-value pairs into column families, according to the family and stored column configurations.|
|SQL||Temporary Tables||CockroachDB now supports session-scoped temporary tables, views, and sequences. Unlike persistent objects, temp objects can only be accessed from the session in which they were created, and they are dropped at the end of the session. This feature is currently experimental.|
|Dev Tools||Expanded ORM Support||CockroachDB now supports additional Postgres-compatible ORMs, including Django, PonyORM, and pewee for Python developers, and jOOQ for Java developers.|
|I/O||Bulk Import Improvements||The
Also, the new
Finally, paused imports, when resumed, now continue from their internally recorded progress instead of starting over.
|Security||RBAC Changes||All role-based access control (RBAC) features (
|Security||Various Improvements||Several security features have been added to CockroachDB v20.1, including the ability to customize the mapping between TLS certificates and principals, to name user/roles with periods so as to reflect the structure of internet domain names, to allow or disallow users from authenticating, and to allow or disallow users from creating, altering, and dropping other users.
Also, CockroachDB's support for the PostgreSQL Host-Based Authentication (HBA) configuration language, which enables sites to customize the principal/client address/authentication method matrix, has been extended and unified.
|CLI||Demo Cluster Improvements||Several features have been added to the
|UI||Various Improvements||The Network Latency page of the Admin UI is now easier to access and has been redesigned to help you understand the round-trip latencies between all nodes in your cluster.
Also, the Statement Details page now allows you to write information about a SQL statement to a diagnostics bundle that you can download. This bundle consists of a JSON file that contains a distributed trace of the SQL statement, a physical query plan, execution statistics, and other information about the query.
|Internals||Various Improvements||CockroachDB's storage layer now uses protected timestamps to ensure the safety of historical data while also enabling shorter GC TTLs. A shorter GC TTL means that fewer previous MVCC values are kept around. This can help lower query execution costs for workloads which update rows frequently throughout the day, since the SQL layer has to scan over previous MVCC values to find the current value of a row.
Also, Cockroach's transaction layer now uses a concurrency manager to sequence incoming requests and provide isolation between the transactions that issued those requests that intend to perform conflicting operations.
These features require an enterprise license. Register for a 30-day trial license here, or consider testing enterprise features locally using the
cockroach demo CLI command, which starts an in-memory CockroachDB cluster with a temporary enterprise license pre-loaded. CockroachCloud clusters also include all enterprise features.
|Recovery||Full-cluster backup and restore||CockroachDB's
|Recovery||Encrypted backups||CockroachDB now supports using an encryption passphrase to encrypt data in Enterprise
|SQL||Improved follower reads||Follower reads are now available for
Before upgrading to CockroachDB v20.1, be sure to review the following backward-incompatible changes and adjust your application as necessary.
extract()built-in function with sub-second arguments (millisecond, microsecond) is now Postgres-compatible and returns the total number of seconds in addition to sub-seconds instead of returning only sub-seconds.
Casting intervals to integers and floats is now Postgres-compatible and values a year at 365.25 days in seconds instead of 365 days.
The combination of the
updatedis now rejected. This is because the use of
key_onlyprevents any rows with updated fields from being emitted, which renders the
cockroach initCLI command now waits for server readiness and thus no longer fails when a mistaken server address is provided.
cockroach userCLI command has been removed. It was previously deprecated in CockroachDB v19.2. Note that a v19.2 client (supporting
cockroach user) can still operate user accounts in a v20.1 server.
CockroachDB now creates files without read permissions for the "others" group. Sites that automate file management (e.g., log collection) using multiple user accounts now must ensure that the CockroachDB server and the management tools running on the same system are part of a shared unix group.
REVOKEstatements now require that the requesting user already have the target privileges themselves. For example,
GRANT SELECT ON t TO foorequires that the requesting user already have the
During an upgrade to v20.1, ongoing schema changes will stop making progress, and it won't be possible to manipulate them via
CANCEL JOBstatements. Once the upgrade has been finalized, these schema changes will run to completion.
During an upgrade to v20.1, new schema changes will be blocked and return an error, with the exception of
CREATE TABLEstatements without foreign key references and no-op schema change statements that use
IF NOT EXISTS. Also, ongoing schema changes started will stop making progress, and it won't be possible to manipulate them via
CANCEL JOBstatements. Once the upgrade has been finalized, ongoing schema changes will run to completion and new schema changes will be allowed.
For information about new and unresolved limitations in CockroachDB v20.1, with suggested workarounds where applicable, see Known Limitations.
|Training||Videos Lessons on YouTube||Added two Cockroach University playlists to YouTube, one with the entire set of video lessons from "Getting Started with CockroachDB", and the other featuring the first batch of video lessons from the upcoming course, "CockroachDB for Python Developers".|
|Docs||Developer Guide||Added guidance on common tasks when building apps on CockroachDB, such as installing Postgres clients; connecting to the database; effectively inserting, querying, updating, and deleting; handling errors; and making queries fast. For convenience, much of the guidance is offered across various popular languages (Java, Python, Go) in addition to straight SQL.|
|Docs||"Hello World" Repos||Added several language-specific GitHub repos with the simple starter applications featured in our "Hello World" tutorials.|
|Docs||Multi-Region Sample App and Tutorial||Added a full-stack, multi-region sample application (live demo, GitHub repo) with an accompanying tutorial on building a multi-region application on a multi-region CockroachCloud cluster. Also added a video demonstration as a YouTube playlist.|
|Docs||Streaming Changefeeds to Snowflake Tutorial||Added an end-to-end tutorial on how to use an Enterprise changefeed to stream row-level changes from CockroachCloud to Snowflake, an online analytical processing (OLAP) database.|
|Docs||Improved Backup/Restore Docs||Updated the backup/restore docs to better separate broadly applicable guidance and best practices from more advanced topics.|
|Docs||Release Support Policy||Added a page explaining Cockroach Lab's policy for supporting major releases of CockroachDB, including the phases of support that each major release moves through, the currently supported releases, and an explanation of the naming scheme used for CockroachDB.|