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set-variable = expire_logs_days=7

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mysql> SET GLOBAL expire_logs_days = 7;

mysql> SHOW GLOBAL VARIABLES like 'expire_logs_days';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| expire_logs_days | 7 |
+------------------+-------+
1 row in set (0.00 sec)

mysql>

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