# S01027 {#s01027}

## Error Code {#error_code .section}

S01027

## Error Message {#error_message .section}

`<WARNING> TSDBEngine::MergeRunner <xxx>. Out of memory error occurred while merging level files of TSDB engine. Will retry in <xxx> seconds. RefId:S01027`

## Probable Causes {#probable_causes .section}

This error is thrown if the TSDB engine encounters an out-of-memory error while merging level files. The TSDB engine will keep retrying until the merge is successfully done.

## Solutions {#solutions .section}

-   Execute functions to clear memory and cache to free up memory.
-   Check if the submitted tasks consume excessive memory, and stop the relevant tasks.
-   Adjust the *maxMemSize*value.

**Parent topic:**[Error Code Reference](../../Troubleshooting/ErrorCode.md)

