Re: Does PostgreSQL ever create indexes on its own?

Doiron, Daniel schrieb am 12.11.2015 um 23:21:
> I’m troubleshooting a schema and found this:
>
> Indexes:
> "pk_patient_diagnoses" PRIMARY KEY, btree (id)
> "index_4341548" UNIQUE, btree (id)
> "idx_patient_diagnoses_deleted" btree (deleted)
> "idx_patient_diagnoses_diagnosis_type_id" btree (diagnosis_type_id)
> "idx_patient_diagnoses_icd10" btree (icd10)
> "idx_patient_diagnoses_icd9" btree (diagnosis_code)
> "idx_patient_diagnoses_is_unknown" btree (is_unknown)
> "idx_patient_diagnoses_modified" btree (modified)
> "idx_patient_diagnoses_patient_id" btree (patient_id)
> "idx_patient_diagnoses_uuid" btree (uuid)
> "index_325532921" btree (modified)
> "index_4345603" btree (deleted)
> "index_4349516" btree (diagnosis_type_id)
> "index_4353417" btree (icd10)
> "index_4384754" btree (diagnosis_code)
> "index_4418849" btree (is_unknown)
> "index_4424101" btree (patient_id)
> "index_4428458" btree (uuid)
>
> My questions is whether these “index_*” indexes could have been created by postgresql or whether I have an errant developer using some kinda third-party tool?

The only index that Postgres "automatically" creates is the unique index supporting a primary key or a unique constraint.

But apart from that, Postgres never creates indexes on its own.

So from the list above, only pk_patient_diagnose has (most probably) been created automatically. Everything else was created manually.