truncate:执行速度较快,因为它一次性删除所有数据,过释放表的存储空间来删除数据,并将表重置为初始状态。 delete:执行速度较慢,因为它需要逐行删除数据,并且会生成大量的事务日志,同时也不释放空间。 drop:执行速度较快,因为它一次性删除整个表。 回滚能力: truncate:不可回滚,一旦执行,数据将被永久删除、无法恢复。
4. Re:es-data的磁盘使用 curl -X DELETE -u admin:xxxxxxxxxx -k --规格严格-功夫到家 5. Re:snmpd修改端口 666666 --规格严格-功夫到家Copyright © 2025 规格严格-功夫到家 Powered by .NET 9.0 on Kubernetes
Tip:TRUNCATEis aPostgreSQL extension that provides a faster mechanism to remove all rows from a table. By default,DELETEwill delete rows in the specified table and all its child tables. If you wish to delete only from the specific table mentioned, you must use theONLYclause. There are two ...
Tip: is a PostgreSQL extension that provides a faster mechanism to remove all rows from a table. By default, DELETE will delete rows in the specified table and all its child tables. If you wish to delete only from the specific table mentioned, you must use the ONLY clause. There ...
在PostgreSQL中,你可以通过以下步骤来实现判断指定ID是否存在,并根据存在与否执行相应的TRUNCATE或DELETE操作。这里需要注意的是,TRUNCATE操作会删除表中的所有数据,并且通常是一个比较重量级的操作,因此在实际应用中需要谨慎使用。 步骤一:判断ID是否存在 你可以使用SELECT EXISTS语句来判断指定ID是否存在于表中。例如,假设...
PostgreSQL 分区表基础：在 PostgreSQL 中，分区表是通过表继承来实现的。每个分区都是一个独立的表，而父表只是一个逻辑结构。你可以按范围、列表或哈希对分区表进行分区。插入示例 在这个例子中，`sales` 表按照 `sale_date` 字段进行了范围分区，分成了两个区，分别是 `sales_2020` 和 `sales_2021`。### ...
truncate和delete命令 1、在功能上,truncate是清空一个表的内容,它相当于deletefromtable_name。2、delete是dml操作,truncate是ddl操作;因此,用delete删除整个表的数据时,会产生大量的roolback,占用很多的rollbacksegments,而truncate不会。3、在内存中,用delete删除数据,表空间中其被删除数据的表占用的空间还在,便于以...
This command deletes all the records from theDepartmenttable but doesn’t delete the table itself. Next, we can verify this with this SQL query: SELECT * FROM Department; We can see the output of the executed SQL query: As seen above, all the records were deleted and the table still ex...
Not supported for SQLite(Lite has only UPSERT statement) nor currently for PostgreSQL. Way to achieve there sync functionality is to Select or BulkRead existing data from DB, split list into sublists and call separately Bulk methods for BulkInsertOrUpdate and Delete. ...
Import data from postgreSQL into SQL server 2005 import data into table that has a timestamp Import flat file which has changing column order using SSIS import images in Excel file to SQL database Import Multiple Files into Multiple Tables using SSIS Import multiple files using sql server managem...