492d5d174a
### What changes were proposed in this pull request? docs/sql-ref-syntax-qry-select-usedb.md -> docs/sql-ref-syntax-ddl-usedb.md docs/sql-ref-syntax-aux-refresh-table.md -> docs/sql-ref-syntax-aux-cache-refresh-table.md ### Why are the changes needed? usedb belongs to DDL. Its location should be consistent with other DDL commands file locations similar reason for refresh table ### Does this PR introduce _any_ user-facing change? before change, when clicking USE DATABASE, the side bar menu shows select commands <img width="1200" alt="Screen Shot 2020-07-04 at 9 05 35 AM" src="https://user-images.githubusercontent.com/13592258/86516696-b45f8a80-bdd7-11ea-8dba-3a5cca22aad3.png"> after change, when clicking USE DATABASE, the side bar menu shows DDL commands <img width="1120" alt="Screen Shot 2020-07-04 at 9 06 06 AM" src="https://user-images.githubusercontent.com/13592258/86516703-bf1a1f80-bdd7-11ea-8a90-ae7eaaafd44c.png"> before change, when clicking refresh table, the side bar menu shows Auxiliary statements <img width="1200" alt="Screen Shot 2020-07-04 at 9 30 40 AM" src="https://user-images.githubusercontent.com/13592258/86516877-3d2af600-bdd9-11ea-9568-0a6f156f57da.png"> after change, when clicking refresh table, the side bar menu shows Cache statements <img width="1199" alt="Screen Shot 2020-07-04 at 9 35 21 AM" src="https://user-images.githubusercontent.com/13592258/86516937-b4f92080-bdd9-11ea-8ad1-5f5a7f58d76b.png"> ### How was this patch tested? Manually build and check Closes #28995 from huaxingao/docs_fix. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Huaxin Gao <huaxing@us.ibm.com>
60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
---
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layout: global
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title: REFRESH TABLE
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displayTitle: REFRESH TABLE
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license: |
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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---
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### Description
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`REFRESH TABLE` statement invalidates the cached entries, which include data
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and metadata of the given table or view. The invalidated cache is populated in
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lazy manner when the cached table or the query associated with it is executed again.
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### Syntax
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```sql
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REFRESH [TABLE] table_identifier
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```
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### Parameters
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* **table_identifier**
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Specifies a table name, which is either a qualified or unqualified name that designates a table/view. If no database identifier is provided, it refers to a temporary view or a table/view in the current database.
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**Syntax:** `[ database_name. ] table_name`
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### Examples
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```sql
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-- The cached entries of the table will be refreshed
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-- The table is resolved from the current database as the table name is unqualified.
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REFRESH TABLE tbl1;
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-- The cached entries of the view will be refreshed or invalidated
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-- The view is resolved from tempDB database, as the view name is qualified.
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REFRESH TABLE tempDB.view1;
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```
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### Related Statements
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* [CACHE TABLE](sql-ref-syntax-aux-cache-cache-table.html)
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* [CLEAR CACHE](sql-ref-syntax-aux-cache-clear-cache.html)
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* [UNCACHE TABLE](sql-ref-syntax-aux-cache-uncache-table.html)
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* [REFRESH](sql-ref-syntax-aux-cache-refresh.html)
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