61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
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---
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layout: global
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title: REFRESH FUNCTION
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displayTitle: REFRESH FUNCTION
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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 FUNCTION` statement invalidates the cached function entry, which includes a class name
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and resource location of the given function. The invalidated cache is populated right away.
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Note that `REFRESH FUNCTION` only works for permanent functions. Refreshing native functions or temporary functions will cause an exception.
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### Syntax
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```sql
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REFRESH FUNCTION function_identifier
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```
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### Parameters
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* **function_identifier**
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Specifies a function name, which is either a qualified or unqualified name. If no database identifier is provided, uses the current database.
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**Syntax:** `[ database_name. ] function_name`
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### Examples
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```sql
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-- The cached entry of the function will be refreshed
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-- The function is resolved from the current database as the function name is unqualified.
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REFRESH FUNCTION func1;
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-- The cached entry of the function will be refreshed
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-- The function is resolved from tempDB database as the function name is qualified.
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REFRESH FUNCTION db1.func1;
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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 TABLE](sql-ref-syntax-aux-cache-refresh-table.html)
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* [REFRESH](sql-ref-syntax-aux-cache-refresh.html)
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