How to fix the Oracle error ORA-01655: unable to extend cluster string.string by string in tablespace string?

In this post, you’ll learn more about the Oracle ErrorORA-01655: unable to extend cluster string.string by string in tablespace string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01655: unable to extend cluster string.string by string in tablespace string

Reason for the Error ORA-01655: unable to extend cluster string.string by string in tablespace string

Failed to allocate an extent of the required number of blocks for a cluster segment in tablespace indicated.

How to fix the Error ORA-01655: unable to extend cluster string.string by string in tablespace string ?

You can fix this error in Oracle by following the below steps

Use ALTER TABLESPACE ADD DATAFILE statement to add one or more files to the tablespace indicated.