| Exists(BatchPolicy, Key) | Check if multiple record keys exist in one batch call. The returned boolean array is in positional order with the original key array order. |
| Exists(Policy, Key) | Determine if a record key exists. Return whether record exists or not. The policy can be used to specify timeouts. |
| Exists(BatchPolicy, ExistsArrayListener, Key) | Asynchronously check if multiple record keys exist in one batch call. Schedule the array exists command with a channel selector and return. Another thread will process the command and send the results to the listener in a single call. |
| Exists(BatchPolicy, ExistsSequenceListener, Key) | Asynchronously check if multiple record keys exist in one batch call. Schedule the exists command with a channel selector and return. Another thread will process the command and send the results to the listener in multiple unordered calls. |
| Exists(BatchPolicy, CancellationToken, Key) | Asynchronously check if multiple record keys exist in one batch call. Create listener, call asynchronous array exists and return task monitor. |
| Exists(Policy, ExistsListener, Key) | Asynchronously determine if a record key exists. Schedule the exists command with a channel selector and return. Another thread will process the command and send the results to the listener. |
| Exists(Policy, CancellationToken, Key) | Asynchronously determine if a record key exists. Create listener, call asynchronous exists and return task monitor. |