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Speeding up comment-ltree migration, fixing index creation. Fixes #2664

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Dessalines 2023-01-20 13:54:46 -05:00
parent 1eaf2c8a03
commit 42de703569
1 changed files with 30 additions and 0 deletions
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30
migrations/2022-07-07-182650_comment_ltrees/up.sql
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@ -60,6 +60,21 @@ FROM q
ORDER BY
breadcrumb;
-- Remove indexes and foreign key constraints, and disable triggers for faster updates
set session_replication_role = 'replica';
alter table comment disable trigger all;
alter table comment drop constraint comment_creator_id_fkey;
alter table comment drop constraint comment_parent_id_fkey;
alter table comment drop constraint comment_post_id_fkey;
alter table comment drop constraint idx_comment_ap_id;
drop index
idx_comment_creator,
idx_comment_parent,
idx_comment_post,
idx_comment_published;
-- Add the ltree column
update comment c
set path = ct.ltree_path
@ -75,9 +90,24 @@ from (
) as c2
where ca.comment_id = c2.id;
-- Delete comments with more than 150 children, otherwise the index creation below will fail
delete from comment where nlevel(path) > 150;
-- Re-enable old constraints and indexes
alter table comment add constraint "comment_creator_id_fkey" FOREIGN KEY (creator_id) REFERENCES person(id) ON UPDATE CASCADE ON DELETE CASCADE;
alter table comment add constraint "comment_post_id_fkey" FOREIGN KEY (post_id) REFERENCES post(id) ON UPDATE CASCADE ON DELETE CASCADE;
alter table comment add constraint "idx_comment_ap_id" unique (ap_id);
create index idx_comment_creator on comment (creator_id);
create index idx_comment_post on comment (post_id);
create index idx_comment_published on comment (published desc);
-- Create the index
create index idx_path_gist on comment using gist (path);
-- Drop the parent_id column
alter table comment drop column parent_id cascade;
set session_replication_role = 'origin';
alter table comment enable trigger all;