Oracle : Ошибка ORA-31004

"Length %s of the BLOB in XDB$H_INDEX is below the minimum %s"
*Cause: In the XDB$H_INDEX table, the CHILDREN column, a BLOB, must
have a certain minimum length without being chained.
The calculated length of the LOB was less than the stated minimum.
*Action: Set the value of the init.ora parameter db_block_size
to at least 2K. For XDB to run at its fastest, set
db_block_size to 8K.

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