今天在检出一个项目时，check out 中断，由于项目文件太多，运行 clean up 命令进程会卡死。然后在 StackOverflow 找到了解决办法，亲测可行：

1. Delete the .svn directory for your working copy.
2. Start a new checkout in a new, temporary directory.
3. Cancel the checkout (we don't want to wait for everything to get pulled down).
4. Run a cleanup on this cancelled checkout.
5. Now we have a new .svn directory with a clean database (although no/few files)
6. Copy this .svn into your old, corrupted working directory.
7. Run svn update and it should bring your new partial .svn directory up to speed with your old working directory.