Software update: CockroachDB 2.1.0

Nov

8

2018

The team behind CockroachDB has released version 2.1.0. This is an open source database that is ideal for cloud environments and offers various options for dealing with problems, thanks to the scattered design. For more information we refer to this page , where the most frequently asked questions are answered. The list of changes looks like this:

What’s New in v2.1.0

With the release of CockroachDB v2.1, we’ve made it easier to migrate from MySQL and Postgres, improved our scalability on transactional workloads by 5x, enhanced our troubleshooting workflows in the Admin UI, and launched a managed offering to help teams. deploy low-latency, multi-region clusters with minimal operator overhead.

Enterprise Features

These new features require an enterprise license.
Change Data Capture (Beta) – Change data capture (CDC) Provides efficient, distributed, row-level change feeds into Apache Kafka for downstream processing such as reporting, caching, or full-text indexing. Use the CREATE CHANGEFEED statement to create a new change feed, which provides row-level change subscriptions.
Encryption at Rest (Experimental) – Encryption at Rest Provides transparent encryption of a node’s data on the local disk.
EXPORT (Beta) – The EXPORT statement exports tabular data or arbitrary statements to CSV files. Using the CockroachDB distributed execution engine, EXPORT parallelizes CSV creation across all nodes in the cluster, making it possible to quickly get large sets of data out of CockroachDB in a format that can be ingested by downstream systems.
Core Features

These new features are available in the core version and do not require an enterprise license.

SQL
ALTER TABLE … ALTER TYPE – The ALTER TABLE … ALTER TYPE statement changes a column’s data type. Only type changes that require data checks nor data conversion are supported at this time.
ALTER COLUMN … DROP STORED – THE ALTER TABLE … ALTER COLUMN … DROP STORED statement converts a stored, computed column into a regular column.
CANCEL JOB – The CANCEL JOB statement can now be implemented on a long-term schedule for change jobs, causing them to terminate early and roll back. Also, the CANCEL JOBS variant of the statement you have multiple jobs at once.
CANCEL QUERIES – The CANCEL QUERIES variant of the CANCEL QUERY statement lets you cancel multiple queries at once.
CANCEL SESSIONS – The CANCEL SESSIONS variant of the CANCEL SESSION statement lets you stop multiple long-running sessions. CANCEL SESSION will attempt to cancel the current active query and end the session. Cost-Based Optimizer – The cost-based optimizer seeks the lowest cost for a query, usually related to time. In versions 2.1 and later, CockroachDB’s cost-based optimizer is enabled by default.
CREATE STATISTICS (Experimental) – The CREATE STATISTICS statement generates table statistics for the cost-based optimizer to use.
EXPLAIN (DISTSQL) – The DISTSQL option generates a physical query plan for a query. Query plans provide information about SQL execution, which can be used to troubleshoot slow queries.
EXPLAIN ANALYZE – The EXPLAIN ANALYZE statement executes a SQL query and returns a physical query plan with execution statistics.
Fast Deletes for Interleaved Tables – DELETE CASCADE will use an optimized code path and run much faster. Lookup Joins (Experimental) – A lookup join is beneficial to use when there is a large imbalance in size between the two tables, as well as the larger table. A lookup join requires that the right-hand (ie, larger) table is indexed on the equality column.
public Role – All users now belong to the public role, to which you can grant and revoke privileges.
SET (session variable), SHOW (session variable) – Added the following options:
statement_timeout: The amount of time a statement can be run before being stopped.
optimizer: The mode in which a query execution plan is generated. If the cost-based optimizer is enabled then the heuristic planner will not be used unless the query is supported by the cost-based optimizer; if set to off, all queries are run through the legacy heuristic planner.
SHOW STATISTICS (Experimental) – The SHOW STATISTICS statement lists table statistics used by the cost-based optimizer.
SNAPSHOT isolation level – Removed. Transactions that request to use SNAPSHOT are now mapped to SERIALIZABLE.
Subquery Support – CockroachDB’s cost-based optimizer supports several common types of correlated subqueries. A subquery is said to be “correlated” when it uses table or column names defined in the surrounding query.
CLI
cockroach demo – The cockroach demo command starts a temporary, in-memory, single-node CockroachDB cluster and opens an interactive SQL shell to it.
cockroach start – The new – advertise-addr flag recognizes both a hostname / address and port and replaces the –advertise-host and –advertise-port flags, which are now deprecated.
The new –listen – addr flag recognizes both a hostname / address and port and replaces the –host and –port flags, which are now deprecated for cockroach but valid for other client commands.
The new –http-addr flag recognizes both a hostname / address and port and replaces the –http-host flag, which is now deprecated.
cockroach sql – The cockroach sql command and other client commands that display SQL results now form the new table result formatter by default, replacing the previous formatter called pretty. This provides more compact and more reusable results.
cockroach zone – Deprecated. The cockroach zone command has been deprecated. To manage replication zones, use the CONFIGURE ZONE statement to add, modify, reset, and remove replication zones.
Operations
Controlling Leaseholder Location – Using replication zones, you can now specify preferences for where a range of leaseholders should be placed in some scenarios.
DBeaver Support – DBeaver, a cross-platform database GUI, has been thoroughly tested and tested with CockroachDB v2.1.
Load-based Rebalancing – In addition to the rebalancing that occurs when nodes join or leave a cluster, leases and replicas are rebalanced automatically based on the relative load within the nodes within a cluster. Note that depending on the needs of your deployment, you can also exercise replication zones on the location of leases and replicas by configuring zones.
Migration from Postgres and MySQL – The IMPORT command now supports importing dump files from Postgres and MySQL.
Monitoring Kubernetes Deployments – Kubernetes tutorials now feature steps on how to integrate withPrometheus, an open source tool for failure, aggregating, and querying time series data, and set up Alert Manager.
Multi-Cluster Kubernetes Deployments – You can now orchestrate a secure CockroachDB deployment across three Kubernetes clusters, each in a different geographic region, using the StatefulSet feature to manage the containers within each cluster and linking them together via DNS.
Pipelining or Transactional Writes – Transactional writes are pipelined when being replicated and dramatically reducing the latency or transactions that perform multiple writes.
Preferred Local Networks – The new -locality-advertise-addr flag on cockroach can be used to tell nodes in specific localities to prefer local or private interfaces. This flag is useful when running a cluster across multiple networks, where nodes in a network are connected to a private or local interface while nodes outside the network do not.
Rolling Upgrade Auto-finalization – By default, as all nodes are running CockroachDB v2.1, the upgrade process will be auto-finalized. This will enable certain performance improvements and bug fixes in the new version.
Viewing Node Status for an Unavailable Cluster – The cockroach node status can now be run when majority of nodes are down. Running the command now shows an additional field: is_available.
Admin UI
Advanced Debugging Page (Experimental) – The Advanced Debugging page provides links to advanced monitoring and troubleshooting reports and cluster configuration details.
Hardware Dashboard – The Hardware dashboard lets you monitor CPU usage, disk throughput, network traffic, storage capacity, and memory.
Statements page – The Statements page helps you identify frequently executed or high latency SQL statements. It also allows you to view the details of SQL statement fingerprints, which are groupings or similar statements with literal values ​​replaced by underscores.
User Authentication – As of v2.1, users must have a username and password to access the Admin UI in a secure cluster.
Documentation
Experimental Features – This new page lists the experimental features that are available in CockroachDB v2.1.
Client Connection Parameters – This new page describes the parameters used to set a client connection. The client connection parameters determine which CockroachDB cluster they connect to, and how to establish this network connection.
Deploying CockroachDB with systemd – The on-premises and cloud deployment tutorials now include instructions for using system to start the nodes of a cluster.
Manual and Automated Backups – This page has been updated to provide both manual and automated backup guidance.
Migration Guide – This new guide provides an overview of migrating from CockroachDB, as well as specific instructions for migrating from Postgres, migrating from MySQL, and migrating from CSV.
Networking Guidance – The Production Checklist now provides a detailed explanation of network flags and scenarios.
Online Schedule Changes – This new page explains how CockroachDB updates table schedule without imposing any downtown or negative consequences on applications.
Performance Benchmarking – This page walks you through TPC-C performance benchmarking on CockroachDB. It measures tpmC (new order transactions / minute) on two TPC-C datasets: 1,000 warehouses (for a total data set size or 200GB) on 3 nodes and 10,000 warehouses (for a total data set size or 2TB) on 30 nodes. Performance Tuning – This new tutorial shows you essential techniques for getting fast reads and writes in CockroachDB, starting with a single-region deployment and expanding into multiple regions.
Secure “Build an App” – Most client driver and ORM tutorials now provide code samples and guidance for secure clusters.
Serializable Transactions – This new tutorial goes through a hypothetical scenario that demonstrates the importance of SERIALIZABLE isolation for data correctness.
SQL Basics Training – In this new training, you learn basic SQL statements.
Window Functions – This new page provides information about window function support in CockroachDB.
Version number 2.1.0
Release status Final
Operating systems Windows 7, Linux, macOS, Windows Server 2012, Windows 8, Windows 10, Windows Server 2016
Website
Cockroach Labs
Download
https://www.cockroachlabs.com/docs/releases/v2.1.0.html
License type Conditions (GNU / BSD / etc.)

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