On Tue, 2007-01-16 at 07:51, Mario Behring wrote: > Hi all, > > Please, if I drop all indexes from a table, can I recreate them after > performing a vacuum full at this table? I mean, I do not know details > about the indexes, so what I am asking is if I issue a REINDEX on this > table, will it create the proper indexes again?
The bad news: No. Once you drop an index it's just gone. More bad news: If it's a primary key index, you probably can't drop it either. Very good news: PostgreSQL stores an index definition for easy index recreation. Let's say your tablename is "mytable" This query will get you all the index creation statements for mytable: select indexdef from pg_indexes where tablename='mytable'; CREATE UNIQUE INDEX mytable_pkey ON mytable USING btree (id) CREATE UNIQUE INDEX mytable_i1_key ON mytable USING btree (i1) CREATE INDEX mytable_i1_i2 ON mytable USING btree (i1, i2) Note that if you're using a schema other than the public one, you might need to add tablespace='tablespacename' to the where clause. ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
