问题
I'm copying 100Million records (about 97G) data to another server using copyDatabase in Mongo. Both servers have more than 500G diskspace. However, i notice although the process is still running, but the actual files are not added anymore. stop at xxxxx.11 any idea?
回答1:
Copy database will move collection data over, then build indexes for each collection. Building indexes on a 100GB data set can take a lot of time (especially with small amounts of RAM). It's likely that you're in the middle of a large index build.
You can check the progress by watching the logs and running db.currentOp() in the shell on the destination DB.
来源：https://stackoverflow.com/questions/11532139/is-there-a-limit-for-copydatabase-in-mongo