If a VARCHAR(MAX) column is included in an index, is the entire value always stored in the index page(s)? ...
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If a VARCHAR(MAX) column is included in an index, is the entire value always stored in the index page(s)?
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I'm asking this out of curiosity, being inspired by this question.
We know that VARCHAR(MAX) values longer than 8000 bytes are not stored in rows, but in separate LOB pages. Subsequently retrieving a row with such value requires two or more logical IO operations (essentially, one more than otherwise would theoretically be necessary).
We can add a VARCHAR(MAX) column to a unique index, as demonstrated in the linked question. If this column has values that exceed 8000 bytes in length, would such values still be stored "inline" in the index leaf pages, or would they also be moved to LOB pages?
sql-server varchar
asked 5 mins ago
mustacciomustaccio
10.1k72240
add a comment |
I'm asking this out of curiosity, being inspired by this question.
We know that VARCHAR(MAX) values longer than 8000 bytes are not stored in rows, but in separate LOB pages. Subsequently retrieving a row with such value requires two or more logical IO operations (essentially, one more than otherwise would theoretically be necessary).
We can add a VARCHAR(MAX) column to a unique index, as demonstrated in the linked question. If this column has values that exceed 8000 bytes in length, would such values still be stored "inline" in the index leaf pages, or would they also be moved to LOB pages?
sql-server varchar
asked 5 mins ago
mustacciomustaccio
10.1k72240
add a comment |
I'm asking this out of curiosity, being inspired by this question.
We know that VARCHAR(MAX) values longer than 8000 bytes are not stored in rows, but in separate LOB pages. Subsequently retrieving a row with such value requires two or more logical IO operations (essentially, one more than otherwise would theoretically be necessary).
We can add a VARCHAR(MAX) column to a unique index, as demonstrated in the linked question. If this column has values that exceed 8000 bytes in length, would such values still be stored "inline" in the index leaf pages, or would they also be moved to LOB pages?
sql-server varchar
asked 5 mins ago
mustacciomustaccio
10.1k72240
I'm asking this out of curiosity, being inspired by this question.
We know that VARCHAR(MAX) values longer than 8000 bytes are not stored in rows, but in separate LOB pages. Subsequently retrieving a row with such value requires two or more logical IO operations (essentially, one more than otherwise would theoretically be necessary).
We can add a VARCHAR(MAX) column to a unique index, as demonstrated in the linked question. If this column has values that exceed 8000 bytes in length, would such values still be stored "inline" in the index leaf pages, or would they also be moved to LOB pages?
sql-server varchar
sql-server varchar
asked 5 mins ago
mustacciomustaccio
10.1k72240
asked 5 mins ago
mustacciomustaccio
10.1k72240
asked 5 mins ago
mustacciomustaccio
10.1k72240
asked 5 mins ago
mustacciomustaccio
10.1k72240
asked 5 mins ago
mustacciomustaccio
10.1k72240
10.1k72240
add a comment |
add a comment |
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