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docs: don't rely on ncli_db pruneDatabase for reducing storage usage (#3355) 

* don't rely on ncli_db pruneDatabase for reducing storage usage

* remove "Running out of storage" section altogether

* Update docs/the_nimbus_book/src/troubleshooting.md

Co-authored-by: sacha <sacha@status.im>

Co-authored-by: sacha <sacha@status.im>
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docs/the_nimbus_book/src/troubleshooting.md
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@ -65,26 +65,10 @@ If you find that `make update` causes the console to hang for too long, try runn
The directory that stores the blockchain data of the testnet is `build/data/prater_shared_0` (if you're connecting to another testnet, replace `prater` with that testnet's name). If you've imported the wrong keys, and wish to start over, delete this repository.
### Sync problems
If you’re experiencing sync problems, we recommend running `make clean-prater` to delete the database and restart your sync (make sure you’ve updated to the latest `master` first though).
If you’re experiencing sync problems, we recommend running `make clean-prater` to delete the database and restart your sync (make sure you’ve updated to the latest `stable` first though).
> **Warning**: `make clean-prater` will erase all of your syncing progress so far, so it should only be used as a last resort -- if your client gets stuck for a long time (because it's unable to find the right chain and/or stay with the same head value) and a normal restart doesn't improve things.
### Running out of storage
If you're running out of storage, you can [prune](https://blog.ethereum.org/2015/06/26/state-tree-pruning/) the database of unnecessary blocks and states by running:
```
make ncli_db
build/ncli_db pruneDatabase --db=build/data/shared_prater_0/db --verbose=true
```
This will create `nbc_pruned.sqlite3` files in `build/data/shared_prater_0/db`, which you can use in place of the orginal `nbc.sqlite3` files. We recommend you hold onto the originals until you've verified that your validator is behaving as expected with the pruned files.
Options:
- `--keepOldStates` (boolean): Keep pre-finalisation states; defaults to `true`.
- `--verbose` (boolean): Print a more verbose output to the console; defaults to `false`.
### noCommand does not accept arguments
If, on start, you see `The command 'noCommand' does not accept arguments`