一、delete产生rollback,如果删除大数据量的表速度会很慢,同时会占用很多的rollback segments .truncate 是DDL操作,不产生rollback,速度快一些. Truncate table does not generate rollback information and redo records so it is much faster than del
I have a table like below. This table went through insert,update,delete. I have a two slaves setup to replicate from a master. The table structure is like this: CREATE TABLE mytable ( `myid` varchar(20) NOT NULL, `last_num` bigint(20) NOT NULL, ...
Any difference between Server.MapPath("~") and Server.MapPath("") ? Any easy way to log user activity after they login? Any event after the page load completed? API GET:Obj ref not set to an instance of an object App_code folder in asp.net 3.5 App_Code folder vs. regular folder Ap...
Difference(s) between ItemsSource and DataContext Different Context Menu for each treeviewitem type in wpf MVVM Disable a button with ICommand in MVVM Disable add new row to wpf datagrid Disable all GUI input until one method completes Disable Alt+F4, Alt+Tab key press Disable button animation...
Our topic is to understand the difference between SQL and MySQL so let’s stick to the topic and get back to the Relational database systems. Let’s start with understanding the basic terms used in this article while explaining the difference between SQL and MySQL. ...
In this tutorial, we’ll talk about the difference between Spring Data JPA and JPA. We’ll also explain how they both work with some high-level overviews and code snippets. Let’s start by explaining some of the history of JDBC and how JPA came to be. 2. From JDBC to JPA Since 1997...
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A: A session is an object that maintains the connection between the Java object application and the database. Session also has methods for storing, retrieving, modifying or deleting data from databases69 using methods like persist(), load(), get(), update(), delete(), etc. Additionally, It...
What is the difference between Update and Alter? Update is a SQL command that is used to update existing records in a database, while alter is a SQL command that is used to modify, delete or add a column to an existing table in a database. ...
This table went through insert,update,delete. I have a two slaves setup to replicate from a master. The table structure is like this: CREATE TABLE mytable ( `myid` varchar(20) NOT NULL, `last_num` bigint(20) NOT NULL, `sessdata` mediumblob, PRIMARY KEY (`myid`)) The ...