Attention : This code requires administrator privileges.
This macro, `%di_util_unlock`, takes the name of a SAS© dataset (with its libref) as input. It first checks if the dataset exists. If so, it executes the `LOCK CLEAR` command to release any existing lock, allowing other processes or users to access it. This is an administrative operation to manage concurrent access.
Data Analysis
Type : EXTERNAL
The macro operates on a SAS dataset passed as a parameter. It does not create or read data, but modifies the lock status of an existing external dataset.
1 Code Block
MACRO
Explanation :
This block defines a macro named `di_util_unlock` that accepts a `ds` argument. Inside the macro, the `%sysfunc(exist(&ds))` function is used to check if the dataset specified by `ds` exists. If the condition is true, the `LOCK &ds CLEAR` statement is executed to lift the lock on that dataset.
This block defines a macro named `di_util_unlock` that accepts a `ds` argument. Inside the macro, the `%sysfunc(exist(&ds))` function is used to check if the dataset specified by `ds` exists. If the condition is true, the `LOCK &ds CLEAR` statement is executed to lift the lock on that dataset.
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| 1 | %macro di_util_unlock(ds); |
| 2 | %IF %sysfunc(exist(&ds)) %THEN %DO; |
| 3 | lock &ds clear; |
| 4 | %END; |
| 5 | %mend; |
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Copyright Info : Copyright (C) 2016 SAS Institute, Inc. All rights reserved.
Expert Advice
Simon
Expert SAS et fondateur.
« The %di_util_unlock macro is a vital utility for automated data pipelines, particularly in multi-user environments. In SAS, a resource lock occurs when a process or user gains exclusive access to a table, preventing others from writing to or sometimes even reading it. This macro ensures that "deadlocks"—where a table remains locked because a previous process crashed or failed to terminate properly—are cleared before your job attempts to run. »