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Performance fix for subscription/subscriber lists based on feedback from ops.

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Extended subscription table indexes for subscriber and subscribed to include the created field, which is used to sort for display. This lets us skip a filesort and do the join much more efficiently.
Alter table from 08to09.sql needs to be run manually (though no ill effects if you forget other than not getting the perf improvement).
This commit is contained in:
Brion Vibber 2009-11-10 08:47:54 -08:00
parent 9d0687b055
commit 737fe76347
4 changed files with 16 additions and 4 deletions
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6
db/08to09.sql
View File

@ -45,3 +45,9 @@ create table login_token (
alter table fave
drop index fave_user_id_idx,
add index fave_user_id_idx (user_id,modified);
alter table subscription
drop index subscription_subscriber_idx,
add index subscription_subscriber_idx (subscriber,created),
drop index subscription_subscribed_idx,
add index subscription_subscribed_idx (subscribed,created);

6
db/08to09_pg.sql
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@ -51,3 +51,9 @@ create table login_token (
alter table fave
drop index fave_user_id_idx,
add index fave_user_id_idx using btree(user_id,modified);
alter table subscription
drop index subscription_subscriber_idx,
add index subscription_subscriber_idx using btree(subscriber,created),
drop index subscription_subscribed_idx,
add index subscription_subscribed_idx using btree(subscribed,created);

4
db/statusnet.sql
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@ -107,8 +107,8 @@ create table subscription (
modified timestamp comment 'date this record was modified',
constraint primary key (subscriber, subscribed),
index subscription_subscriber_idx (subscriber),
index subscription_subscribed_idx (subscribed),
index subscription_subscriber_idx (subscriber, created),
index subscription_subscribed_idx (subscribed, created),
index subscription_token_idx (token)
) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;

4
db/statusnet_pg.sql
View File

@ -115,8 +115,8 @@ create table subscription (
primary key (subscriber, subscribed)
);
create index subscription_subscriber_idx on subscription using btree(subscriber);
create index subscription_subscribed_idx on subscription using btree(subscribed);
create index subscription_subscriber_idx on subscription using btree(subscriber,created);
create index subscription_subscribed_idx on subscription using btree(subscribed,created);
create sequence notice_seq;
create table notice (