log string of thread string, checksum error in the file header

The file header for the redo log contains a checksum that does not match the value calculated from the file header as read from disk. This means the file header is corrupted

How to Solve :

Find and install correct version of log or reset logs.

log string of thread string, wrong log # string in header

The internal information in an online log file does not match the control file.

How to Solve :

Restore correct file or reset logs.

log string of thread string, expected block size string doesnt match string

On header read the blocksize indicated in the control file did not match the blocksize contained in the log file.

Restore correct file or reset logs.

log string of thread string, cannot update log file header

Cannot write to the log file.

Restore the access to the file.

log string of thread string, physical size string less than needed string

A log file has shrunk in size. This is likely to have been caused by operator or operating system error.

Restore the log file from backup. If backup is not available, drop this log and re-create. If the database was shut down cleanly, no further action should be required; otherwise incomplete recovery may be required.