# Tuning Aurora MySQL with thread states
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The following table summarizes the most common general thread states for Aurora MySQL.


| General thread state | Description | 
| --- | --- | 
|  [creating sort index](ams-states.sort-index.md)  |  This thread state indicates that a thread is processing a `SELECT` statement that requires the use of an internal temporary table to sort the data.  | 
|  [sending data](ams-states.sending-data.md)  |  This thread state indicates that a thread is reading and filtering rows for a query to determine the correct result set.  |