Android Room数据库创建了3个文件，包括-shm和-wal文件 [英] Android Room database created 3 files including -shm and -wal files

问题描述

我已经使用Room数据库库创建了一个名为ImageDatabase的数据库，当我在Android Studio中打开设备文件浏览器的数据库文件夹中时，有三个文件名为ImageDatabase，ImageDatabase-shm和ImageDatabase-wal.我想知道这些文件是什么意思?任何帮助都会很棒谢谢所有人

I have created a database using Room database library with name ImageDatabase, when I opened my Device File explorer in Android studio inside the database folder there were three files with names ImageDatabase, ImageDatabase-shm and ImageDatabase-wal. I wanted to know what are these files meant for? Any help would be great Thanx All

推荐答案

数据库中的数据全部包含在这三个数据库中.没有扩展名的是主数据库.其他是 W 仪式 A 头 L og文件( -wal )和 Sh 获得 M 记忆文件( -shm ).基础SQLite系统使用它们来提高性能，并包含对主数据库的最新更改，直到检查点完成.您可以在 SQLite文档中找到更多信息.

The data in your database is contained in all three. The one with no extension is the main database. The others are the Write Ahead Log file (-wal) and the Shared Memory file (-shm). They are used by the underlying SQLite system to improve performance, and contain the latest changes to the main database until a checkpoint is done. You can find more information in the SQLite docs.

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