Database - RAC/Scalability (MOSC)

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Does altering a column length locks for DMLs?

in Database - RAC/Scalability (MOSC) 1 commentAnswered

We have a table with 500 Million records, and we have to alter a column length from Varchar2(20) to Varchar2(40). Does this alter statement locks for DML so until the alter completes we wont be able to run any inserts/updates?

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