Troubleshooting kernel: EXT4-fs warning (device dm-0): ext4_dx_add_entry: Directory index full!

The following error message is displayed in the database host operating system log of a customer today.

kernel: EXT4-fs warning (device dm-0): ext4_dx_add_entry: Directory index full!

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Troubleshooting ORA-600 [kcrfw_search_blklctn: Dead loop] and more about NSA process

Starting with 11gR1, Oracle Data Guard asynchronous redo transport will read redo directly from the in-memory log buffer, provided that the requested redo blocks still reside in the log buffer, start 11g R2 use NSA backgroup process do that.

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