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The maximum key size means:
The total index length + length of the key (2 Bytes) + ROWID (6 Bytes) + the length of the rowid (1 byte).
The total index length is computed as the sum of the width of all indexed columns plus the number of indexed columns. Date fields have a length of 7, character fields have their defined length, and numeric fields have a length of 22. Numeric length = (precision/2) + 1. If negative, add +1.
For Funtion-based indexes, we must calculate the length of the return type.
This index key size is limited by the value of db_block_size, because a key value may not span multiple blocks. In fact, it is required that any index block must contain at least TWO index entries per block.
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