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摘要: revoke ALL PRIVILEGES ON *.* from 'vaen'@'%'; grant select,insert,update,delete,index on *.* to 'vaen'@'%'; flush privileges; 阅读全文
posted @ 2022-12-22 20:48 vaen 阅读(18) 评论(0) 推荐(0)
摘要: 1.schema层面变更 ALTER DATABASE XXXX_db CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; 2.表层面变更 ALTER TABLE XXXXX_TBL CONVERT TO CHARACTER SET utf8mb4 C 阅读全文
posted @ 2022-11-28 11:13 vaen 阅读(258) 评论(0) 推荐(0)
摘要: 参数大全 https://blog.csdn.net/zhou920786312/article/details/123354503 自用备份单个表结构 mysqldump -unt -proot --host=localhost -B xxxx_db --tables xxx_tbl --no-d 阅读全文
posted @ 2022-11-07 14:39 vaen 阅读(18) 评论(0) 推荐(0)
摘要: 计算脏页比例 select VARIABLE_VALUE into @a from performance_schema.global_status where VARIABLE_NAME = 'Innodb_buffer_pool_pages_dirty'; select VARIABLE_VAL 阅读全文
posted @ 2022-11-04 00:41 vaen 阅读(114) 评论(0) 推荐(0)
摘要: org.springframework.dao.DuplicateKeyException: PreparedStatementCallback; SQL [INSERT into BATCH_JOB_INSTANCE(JOB_INSTANCE_ID, JOB_NAME, JOB_KEY, VERS 阅读全文
posted @ 2022-06-24 11:01 vaen 阅读(647) 评论(0) 推荐(0)
摘要: 可以使用 spring.batch.initializer.enabled=false 显式关闭初始化功能 阅读全文
posted @ 2022-06-24 11:00 vaen 阅读(98) 评论(0) 推荐(0)
摘要: @echo off #关闭显示 set dd=%date:~8,2% #dd=日期 set mm=%date:~5,2% #mm=月份 set yy=%date:~0,4% #yy=年份 set Tmm=%TIME:~3,2% #Tmm=分钟 set Thh=%TIME:~0,2% #Thh=小时 阅读全文
posted @ 2022-06-10 12:29 vaen 阅读(2046) 评论(0) 推荐(0)
摘要: 精品原文 https://blog.csdn.net/ranran0224/article/details/120569354 临时改配置 show variables like '%max_connection%'; show variables like '%cache_size%'; set 阅读全文
posted @ 2022-06-09 09:50 vaen 阅读(165) 评论(0) 推荐(0)
摘要: 纯sql操作。(当插入数据时,如出现错误时,如重复数据,将不返回错误,只以警告形式返回) INSERT IGNORE INTO a_db.tb1 SELECT * FROM b_db.tb2; sql拼接 select CONCAT('INSERT IGNORE INTO a_db.',TABLE_ 阅读全文
posted @ 2022-06-09 00:04 vaen 阅读(602) 评论(0) 推荐(0)
摘要: SELECT table_name ,column_name ,column_type from information_schema.columns where table_schema = 'dev' and column_name like '%PASSWORD%'; 阅读全文
posted @ 2022-05-10 17:24 vaen 阅读(22) 评论(0) 推荐(0)
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