update the indexed column

I got a name emp table that holds at least 30000 lines and I had created an index on emp_city

What happens if I update a value of emp_city? What effect will create it on the index or table?

the index will be updated automatically?

the index become invalid?

the line in the journal in the index will be deleted and inserted?

or updated in the journal will take place?

According to the name of the field, I understand that the distribution is pretty sparse for normal index on emp_city.

Will be better to create a bitmap index where you apply to this table with OLAP queries or not create an index on this field.

I don't care

If you have an index on emp_city or emp_city is a part of some regular index and you will upadate all value emp_city:

the index will be automatically updated. (Yes)

the index become invalid?  (No, but I suggest that you run statistics on index or table wole)

the line in the journal in the index will be deleted and inserted? or updated in the journal will take place?

It's block of sheets (not rank of petals). Entire block will be replaced.

Best,

Ark

Tags: Database

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