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Add two new indexes to DB for faster querying

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This commit is contained in:
Marcel Schwarz 2020-12-20 01:36:17 +01:00
parent 0cac5e806f
commit 20bdce68a3
1 changed files with 12 additions and 0 deletions
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12
projects/project-3/backend/db_init.py
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@ -95,9 +95,21 @@ def init_database():
def create_indexes():
LOG.info("Try to create indexes")
conn = sqlite3.connect(DB_NAME, timeout=300)
LOG.info("Starting to build index: idx_date_of_start_date")
conn.execute("""CREATE INDEX IF NOT EXISTS idx_date_of_start_date
ON usage_stats (date(start_date, "unixepoch"))""")
conn.commit()
LOG.info("Created index: idx_date_of_start_date")
LOG.info("Starting to build index: idx_end_station_id_date_of_start_date")
conn.execute("""CREATE INDEX IF NOT EXISTS "idx_end_station_id_date_of_start_date"
ON "usage_stats" ("end_station_id" ASC, date(start_date, "unixepoch"))""")
conn.commit()
LOG.info("Created index: idx_end_station_id_date_of_start_date")
LOG.info("Starting to build index: idx_start_station_id_date_of_start_date")
conn.execute("""CREATE INDEX IF NOT EXISTS "idx_start_station_id_date_of_start_date"
ON "usage_stats" ("start_station_id" ASC, date("start_date", "unixepoch"))""")
conn.commit()
LOG.info("Created index: idx_start_station_id_date_of_start_date")
conn.close()
LOG.info("Indexes created")