EXPLAIN does not appear to work on ALTER TABLE statements:
=> EXPLAIN ALTER TABLE "foo" ALTER COLUMN "bar" SET NOT NULL;
ERROR: syntax error at or near "ALTER"
LINE 1: explain ALTER TABLE "foo" ALTER COLUMN "bar" SET NOT NULL;
^
Zev
On 02/25/2014 01:56 PM, Sameer Kumar wrote:
I think index should help.
Why don't you try it out and check the explain plan of it?
If you are planning to break it down as below:
1. ALTER TABLE "foo" ADD COLUMN "bar" boolean;
2. UPDATE foo SET bar = False; -- Done in batches
3. ALTER TABLE "foo" ALTER COLUMN "bar" SET DEFAULT False;
4. ALTER TABLE "foo" ALTER COLUMN "bar" SET NOT NULL;
I would suggest on interchanging operation 2 and 3 in sequence
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