03/03: Increase statistics targets for the derivation_inputs table

[Christopher Baines]

cbaines pushed a commit to branch master
in repository data-service.

commit 6e390c9b9d8784a7f37e2eb2d304d30ca2dc6c3a
Author: Christopher Baines <mail@cbaines.net>
AuthorDate: Sun Dec 27 10:37:06 2020 +0000

    Increase statistics targets for the derivation_inputs table
    
    It has a lot of rows, and this seems to help the query planning for
    select-required-builds-that-failed, as I think it helps PostgreSQL better
    estimate the row counts that different parts of the query will produce.
---
 sqitch/deploy/increase_derivation_inputs_statistics_targets.sql | 8 ++++++++
 sqitch/revert/increase_derivation_inputs_statistics_targets.sql | 7 +++++++
 sqitch/sqitch.plan                                              | 1 +
 sqitch/verify/increase_derivation_inputs_statistics_targets.sql | 7 +++++++
 4 files changed, 23 insertions(+)

diff --git a/sqitch/deploy/increase_derivation_inputs_statistics_targets.sql 
b/sqitch/deploy/increase_derivation_inputs_statistics_targets.sql
new file mode 100644
index 0000000..e0da041
--- /dev/null
+++ b/sqitch/deploy/increase_derivation_inputs_statistics_targets.sql
@@ -0,0 +1,8 @@
+-- Deploy guix-data-service:increase_derivation_inputs_statistics_targets to pg
+
+BEGIN;
+
+ALTER TABLE derivation_inputs ALTER COLUMN derivation_id SET STATISTICS 10000;
+ALTER TABLE derivation_inputs ALTER COLUMN derivation_output_id SET STATISTICS 
10000;
+
+COMMIT;
diff --git a/sqitch/revert/increase_derivation_inputs_statistics_targets.sql 
b/sqitch/revert/increase_derivation_inputs_statistics_targets.sql
new file mode 100644
index 0000000..c5023b0
--- /dev/null
+++ b/sqitch/revert/increase_derivation_inputs_statistics_targets.sql
@@ -0,0 +1,7 @@
+-- Revert guix-data-service:increase_derivation_inputs_statistics_targets from 
pg
+
+BEGIN;
+
+-- XXX Add DDLs here.
+
+COMMIT;
diff --git a/sqitch/sqitch.plan b/sqitch/sqitch.plan
index 85363da..fc3b998 100644
--- a/sqitch/sqitch.plan
+++ b/sqitch/sqitch.plan
@@ -76,3 +76,4 @@ git_repositories_add_fetch_with_authentication_field 
2020-10-07T17:31:20Z Christ
 create_latest_build_status 2020-10-13T17:22:39Z Christopher Baines 
<mail@cbaines.net> # Create the latest_build_status table
 regenerate_latest_build_status 2020-10-21T18:39:03Z Christopher Baines 
<mail@cbaines.net> # Regenerate the latest_build_status table
 guix_revision_package_derivations_add_package_derivation_index 
2020-10-27T16:58:08Z Christopher Baines <mail@cbaines.net> # Add index for 
guix_revision_package_derivations.package_derivation_id
+increase_derivation_inputs_statistics_targets 2020-12-27T10:34:58Z Christopher 
Baines <mail@cbaines.net> # Increase stats targets on derivation_inputs fields
diff --git a/sqitch/verify/increase_derivation_inputs_statistics_targets.sql 
b/sqitch/verify/increase_derivation_inputs_statistics_targets.sql
new file mode 100644
index 0000000..e647e8e
--- /dev/null
+++ b/sqitch/verify/increase_derivation_inputs_statistics_targets.sql
@@ -0,0 +1,7 @@
+-- Verify guix-data-service:increase_derivation_inputs_statistics_targets on pg
+
+BEGIN;
+
+-- XXX Add verifications here.
+
+ROLLBACK;