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In 12c, the space that can be used by an individual Index key, can it extend over 1/3 of the DB_BLOC

edited Sep 9, 2020 12:03AM in Database Administration (MOSC) 6 commentsAnswered ✓

Hi All,

We have a 12.1.0.2.0 Oracle standard edition database.

There is a requirement to create an index on VARCHAR2(4000) column.

Following is stated in the Oracle document related to Oracle 8i:: ORA-01450 and Maximum Key Length - How it is Calculated (Doc ID 136158.1),

     "the actual space that can be used for the Index key is actually just over 1/3 of the DB_BLOCK_SIZE"

The document is relevant for 8i but wanted to confirm what is the similar guideline or limitation for 12c?

DB_BLOCK_SIZE is 8k and all tablespaces are created with this block size.

Thanks & regards,

Vinayak

There is a requirement to create an index on VARCHAR2(4000) column

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