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Lauren committed Aug 27, 2019
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Expand Up @@ -10,7 +10,7 @@ In addition to bug fixes and various general, enterprise, SQL, and command-line

- **Locality-aware backup and restore**: You can now back up or restore a subset of a table's data according to zone configurations (e.g., send your EU backup partition to an EU cloud storage location).
- [**Import performance improvements**](../v19.2/import.html): Internal improvements have been made to `IMPORT` to enable more efficient loading of large data sets.
- **Show partitions using SQL**: CockroachDB now supports the `SHOW PARTITIONS` [statement](sql-statements.html), which can be used to identify partitions. It also enhances [`SHOW CREATE TABLE`](../v19.2/show-create.html) to show constraints as described.
- **Show partitions using SQL**: CockroachDB now supports the `SHOW PARTITIONS` [statement](../v19.2/sql-statements.html), which can be used to identify partitions. It also enhances [`SHOW CREATE TABLE`](../v19.2/show-create.html) to show constraints as described.
- **Productionize Vectorization Prototype**: Queries are now automatically faster for users. This work expands upon the SQL Vectorization Prototype and allows it to be used in production. Note, this does not cover the long-tail of features necessary to use vectorization on all queries. Vectorized execution is turned on by default for a subset of queries and default back to DistSQL execution for unsupported queries
- **Improve Streaming Behavior on JDBC Driver**: PostgreSQL wire protocol cursors have been implemented. As a result, PGJDBC is able to use streaming behavior to return pagination related results.
- [**Improve partitioning user experience**](../v19.2/partitioning.html): CockroachDB now prevents users from specifying a non-partitioned secondary index on a partitioned table by default to improve performance. Users will have the ability to override this default as it may be necessary in some rare use cases. Additionally, users can now specify the same name for the partition for tables and for all corresponding indexes.
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- Added the `SHOW PARTITIONS` command. [#39053][#39053] {% comment %}doc{% endcomment %}
- [`CREATE VIEW`](../v19.2/create-view.html) now supports all queries supported by the optimizer, including those containing [correlated subqueries](../v19.2/subqueries.html#correlated-subqueries). [#39169][#39169] {% comment %}doc{% endcomment %}
- Mutations are no longer allowed inside [views](../v19.2/views.html). [#39169][#39169] {% comment %}doc{% endcomment %}
- Added the `COLLATION FOR` syntax and `pg_collation_for()` [built-in function](functions-and-operators.html). [#39198][#39198] {% comment %}doc{% endcomment %}
- Added the `COLLATION FOR` syntax and `pg_collation_for()` [built-in function](../v19.2/functions-and-operators.html). [#39198][#39198] {% comment %}doc{% endcomment %}
- Implemented the `timezone()` built-in and `AT TIME ZONE` syntax, which allows converting a `timestamptz` into a `timezone` at a specified timezone, and converting a `timestamp` into a `timestamptz` at a specified timezone. [#39186][#39186] {% comment %}doc{% endcomment %}
- The new `vectorize_row_count_threshold` [cluster setting](../v19.2/cluster-settings.html) controls when the vectorized execution engine is used. [#39329][#39329] {% comment %}doc{% endcomment %}
- Added a `VEC` option to the [`EXPLAIN`](explain.html) command, which shows detailed plan information for vectorized plans. [#39280][#39280] {% comment %}doc{% endcomment %}
- Added a `VEC` option to the [`EXPLAIN`](../v19.2/explain.html) command, which shows detailed plan information for vectorized plans. [#39280][#39280] {% comment %}doc{% endcomment %}
- Partition names can now be reused between different indexes on the same table. [#39332][#39332] {% comment %}doc{% endcomment %}
- Columns without an explicit default value now support foreign keys with the `SET DEFAULT` action, in the same way as the `SET NULL` and `SET DEFAULT NULL` cases. [#39136][#39136] {% comment %}doc{% endcomment %}
- Added [`SHOW JOB <jobid>`](../v19.2/show-jobs.html), `SHOW JOB <a_expr>`, and `SHOW JOBS <selectclause>`. [#39324][#39324] {% comment %}doc{% endcomment %}
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- [`cockroach workload`](../v19.2/cockroach-workload.html) now supports additional command-line parameters to customize the output, to facilitate the integration with third-party testing tools:
- For tools that wish to observe the metrics more frequently than every second, a new flag `--display-every` is now supported, which can be used to specify the period between metric reports. This applies to both the JSON and textual output.
- For tools that require a different output format than the default, a new `--display-format` argument is supported. For now only the formats "simple" (original output format) and "incremental-json" ([RFC3339](https://tools.ietf.org/html/rfc3339) timestamps, no summary row) are supported. [#37929][#37929] {% comment %}doc{% endcomment %}
- Added `\d`, `\dt`, `\du`, `\l` metacommands to the [cockroach sql](../v19.2/use-the-build-in-sql-client.html) interactive shell. [#39141][#39141] {% comment %}doc{% endcomment %}
- Added `\d`, `\dt`, `\du`, `\l` metacommands to the [cockroach sql](../v19.2/use-the-built-in-sql-client.html) interactive shell. [#39141][#39141] {% comment %}doc{% endcomment %}

### Bug fixes

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### Doc updates

- Added an [Oracle migration guide](../v19.2/migrate-from-oracle.html), which guides users through the process of converting their schema and then exporting their data so they can load it into CockroachDB via [`IMPORT`](../v19.2/import.html). [#5902](https://github.com/cockroachdb/docs/pull/5092)
- Added an [overview of MovR](movr.html), CockroachDB's fictional vehicle-sharing dataset and application, and updated several SQL pages and examples to use the built-in MovR dataset, for example, [Learn CockroachDB SQL](learn-cockroachdb-sql.html). [#5075](https://github.com/cockroachdb/docs/pull/5075), [#5216](https://github.com/cockroachdb/docs/pull/5216)
- Added a tutorial on [how to use `EXPLAIN` to identify and resolve common SQL performance problems](learn-cockroachdb-sql.html). [#5178](https://github.com/cockroachdb/docs/pull/5178)
- Added an [overview of MovR](../v19.2/movr.html), CockroachDB's fictional vehicle-sharing dataset and application, and updated several SQL pages and examples to use the built-in MovR dataset, for example, [Learn CockroachDB SQL](../v19.2/learn-cockroachdb-sql.html). [#5075](https://github.com/cockroachdb/docs/pull/5075), [#5216](https://github.com/cockroachdb/docs/pull/5216)
- Added a tutorial on [how to use `EXPLAIN` to identify and resolve common SQL performance problems](../v19.2/learn-cockroachdb-sql.html). [#5178](https://github.com/cockroachdb/docs/pull/5178)


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