I want to create a Primary Key on a table with 6 Million records, but when I execute this:
ALTER TABLE schema_name.table_name ADD CONSTRAINT pkey_name PRIMARY KEY (field_pkey_name);
It's locking my table and alter table does not finish executing...
Try to do it in two steps:
CREATE UNIQUE INDEX CONCURRENTLY pkey_name
ON schema_name.table_name (field_pkey_name);
ALTER TABLE schema_name.table_name
ADD CONSTRAINT pkey_name PRIMARY KEY USING INDEX pkey_name;
It will still take a long time (even longer), but the table will not be locked.
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