[OSSTEST PATCH 03/14] schema: Provide indices for sg-report-flight

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

These indexes allow very fast lookup of "relevant" flights eg when
trying to justify failures.

In my ad-hoc test case, these indices (along with the subsequent
changes to sg-report-flight and Executive.pm, reduce the runtime of
sg-report-flight from 2-3ks (unacceptably long!) to as little as
5-7s seconds - a speedup of about 500x.

(Getting the database snapshot may take a while first, but deploying
this code should help with that too by reducing long-running
transactions.  Quoted perf timings are from snapshot acquisition.)

Without these new indexes there may be a performance change from the
query changes.  I haven't benchmarked this so I am setting the schema
updates to be Preparatory/Needed (ie, "Schema first" as
schema/README.updates has it), to say that the index should be created
before the new code is deployed.

Testing: I have tested this series by creating experimental indices
"trial_..." in the actual production instance.  (Transactional DDL was
very helpful with this.)  I have verified with \d that schema update
instructions in this commit generate indexes which are equivalent to
the trial indices.

Deployment: AFter these schema updates are applied, the trial indices
are redundant duplicates and should be deleted.

CC: George Dunlap <George.Dunlap@xxxxxxxxxx>
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 schema/runvars-built-index.sql    | 7 +++++++
 schema/runvars-revision-index.sql | 7 +++++++
 schema/steps-job-index.sql        | 7 +++++++
 3 files changed, 21 insertions(+)
 create mode 100644 schema/runvars-built-index.sql
 create mode 100644 schema/runvars-revision-index.sql
 create mode 100644 schema/steps-job-index.sql

diff --git a/schema/runvars-built-index.sql b/schema/runvars-built-index.sql
new file mode 100644
index 00000000..94f85ed8
--- /dev/null
+++ b/schema/runvars-built-index.sql
@@ -0,0 +1,7 @@
+-- ##OSSTEST## 007 Preparatory
+--
+-- This index helps sg-report-flight find relevant flights.
+
+CREATE INDEX runvars_built_revision_idx
+    ON runvars (val)
+ WHERE name LIKE 'built_revision_%';
diff --git a/schema/runvars-revision-index.sql 
b/schema/runvars-revision-index.sql
new file mode 100644
index 00000000..a2e3be13
--- /dev/null
+++ b/schema/runvars-revision-index.sql
@@ -0,0 +1,7 @@
+-- ##OSSTEST## 008 Preparatory
+--
+-- This index helps Executive::report__find_test find relevant flights.
+
+CREATE INDEX runvars_revision_idx
+    ON runvars (val)
+ WHERE name LIKE 'revision_%';
diff --git a/schema/steps-job-index.sql b/schema/steps-job-index.sql
new file mode 100644
index 00000000..07dc5a30
--- /dev/null
+++ b/schema/steps-job-index.sql
@@ -0,0 +1,7 @@
+-- ##OSSTEST## 006 Preparatory
+--
+-- This index helps sg-report-flight find if a test ever passed.
+
+CREATE INDEX steps_job_testid_status_idx
+    ON steps (job, testid, status);
+
-- 
2.20.1