74527868b2
### What changes were proposed in this pull request? Document ALTER DATABSE statement in SQL Reference Guide. ### Why are the changes needed? Currently Spark lacks documentation on the supported SQL constructs causing confusion among users who sometimes have to look at the code to understand the usage. This is aimed at addressing this issue. ### Does this PR introduce any user-facing change? Yes. **Before:** There was no documentation for this. **After.** <img width="1234" alt="Screen Shot 2019-08-28 at 1 51 13 PM" src="https://user-images.githubusercontent.com/14225158/63891854-fc817580-c99a-11e9-918e-6b305edf92e6.png"> <img width="1234" alt="Screen Shot 2019-08-28 at 1 51 27 PM" src="https://user-images.githubusercontent.com/14225158/63891869-0acf9180-c99b-11e9-91a4-04d870474a40.png"> ### How was this patch tested? Tested using jykyll build --serve Closes #25523 from dilipbiswal/ref-doc-alterdb. Lead-authored-by: Dilip Biswal <dbiswal@us.ibm.com> Co-authored-by: Xiao Li <gatorsmile@gmail.com> Signed-off-by: Xiao Li <gatorsmile@gmail.com>
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| layout | title | displayTitle | license |
|---|---|---|---|
| global | ALTER DATABASE | ALTER DATABASE | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. |
Description
You can alter metadata associated with a database by setting DBPROPERTIES. The specified property
values override any existing value with the same property name. Please note that the usage of
SCHEMA and DATABASE are interchangable and one can be used in place of the other. An error message
is issued if the database is not found in the system. This command is mostly used to record the metadata
for a database and may be used for auditing purposes.
Syntax
{% highlight sql %} ALTER {DATABASE | SCHEMA} database_name SET DBPROPERTIES (propery_name=property_value, ...); {% endhighlight %}
Parameters
database_name- Specifies the name of the database to be altered.
Examples
{% highlight sql %}
-- Creates a database named inventory.
CREATE DATABASE inventory;
-- Alters the database to set properties Edited-by and Edit-date.
ALTER DATABASE inventory SET DBPROPERTIES ('Edited-by' = 'John', 'Edit-date' = '01/01/2001');
-- Verify that properties are set. DESCRIBE DATABASE EXTENDED inventory;
+-------------------------+--------------------------------------------+ |database_description_item|database_description_value | +-------------------------+--------------------------------------------+ |Database Name |inventory | |Description | | |Location |file:/temp/spark-warehouse/inventory.db | |Properties |((Edit-date,01/01/2001), (Edited-by,John)) | +-------------------------+--------------------------------------------+ {% endhighlight %}