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pg-extras

A heroku plugin for awesome pg:* commands that are also great and fun and super.

Installation

~ ➤ heroku plugins:install git://github.com/heroku/heroku-pg-extras.git

Usage

~ ➤ heroku pg:cache-hit -adashboard
      name      |         ratio
----------------+------------------------
 index hit rate | 0.99957765013541945832
 table hit rate |                   1.00
(2 rows)

~ ➤ heroku pg:index-usage -adashboard
       relname       | percent_of_times_index_used | rows_in_table
---------------------+-----------------------------+---------------
 events              |                          65 |       1217347
 app_infos           |                          74 |        314057
 app_infos_user_info |                           0 |        198848
 user_info           |                           5 |         94545
 delayed_jobs        |                          27 |             0
(5 rows)

~ ➤ heroku pg:ps
 procpid |                 source                   |   running_for   | waiting |         query
---------+------------------------------------------+-----------------+---------+-----------------------
   31776 | psql                                     | 00:19:08.017088 | f       | <IDLE> in transaction
   31912 | psql                                     | 00:18:56.12178  | t       | select * from hello;
   32670 | Heroku Postgres Data Clip daaiifuuraiyks | 00:00:25.625609 | f       | BEGIN READ ONLY; select pg_sleep(60)
(2 rows)

~ ➤ heroku pg:locks
 procpid | relname | transactionid | granted |     query_snippet     |       age
---------+---------+---------------+---------+-----------------------+-----------------
   31776 |         |               | t       | <IDLE> in transaction | 00:19:29.837898
   31776 |         |          1294 | t       | <IDLE> in transaction | 00:19:29.837898
   31912 |         |               | t       | select * from hello;  | 00:19:17.94259
    3443 |         |               | t       |                      +| 00:00:00
         |         |               |         |    select            +|
         |         |               |         |      pg_stat_activi   |
(4 rows)

~ ➤ heroku pg:outliers
                   qry                   |    exec_time     | prop_exec_time |   ncalls    | sync_io_time
-----------------------------------------+------------------+----------------+-------------+--------------
 SELECT * FROM archivable_usage_events.. | 154:39:26.431466 | 72.2%          | 34,211,877  | 00:00:00
 COPY public.archivable_usage_events (.. | 50:38:33.198418  | 23.6%          | 13          | 13:34:21.00108
 COPY public.usage_events (id, reporte.. | 02:32:16.335233  | 1.2%           | 13          | 00:34:19.784318
 INSERT INTO usage_events (id, retaine.. | 01:42:59.436532  | 0.8%           | 12,328,187  | 00:00:00
 SELECT * FROM usage_events WHERE (alp.. | 01:18:10.754354  | 0.6%           | 102,114,301 | 00:00:00
 UPDATE usage_events SET reporter_id =.. | 00:52:35.683254  | 0.4%           | 23,786,348  | 00:00:00
 INSERT INTO usage_events (id, retaine.. | 00:49:24.952561  | 0.4%           | 21,988,201  | 00:00:00
 COPY public.app_ownership_events (id,.. | 00:37:14.31082   | 0.3%           | 13          | 00:12:32.584754
 INSERT INTO app_ownership_events (id,.. | 00:26:59.808212  | 0.2%           | 383,109     | 00:00:00
 SELECT * FROM app_ownership_events   .. | 00:19:06.021846  | 0.1%           | 744,879     | 00:00:00
(10 rows)

~ ➤ heroku pg:calls
                   qry                   |    exec_time     | prop_exec_time |   ncalls    | sync_io_time
-----------------------------------------+------------------+----------------+-------------+--------------
 SELECT * FROM usage_events WHERE (alp.. | 01:18:11.073333  | 0.6%           | 102,120,780 | 00:00:00
 BEGIN                                   | 00:00:51.285988  | 0.0%           | 47,288,662  | 00:00:00
 COMMIT                                  | 00:00:52.31724   | 0.0%           | 47,288,615  | 00:00:00
 SELECT * FROM  archivable_usage_event.. | 154:39:26.431466 | 72.2%          | 34,211,877  | 00:00:00
 UPDATE usage_events SET reporter_id =.. | 00:52:35.986167  | 0.4%           | 23,788,388  | 00:00:00
 INSERT INTO usage_events (id, retaine.. | 00:49:25.260245  | 0.4%           | 21,990,326  | 00:00:00
 INSERT INTO usage_events (id, retaine.. | 01:42:59.436532  | 0.8%           | 12,328,187  | 00:00:00
 SELECT * FROM app_ownership_events   .. | 00:19:06.289521  | 0.1%           | 744,976     | 00:00:00
 INSERT INTO app_ownership_events(id, .. | 00:26:59.885631  | 0.2%           | 383,153     | 00:00:00
 UPDATE app_ownership_events SET app_i.. | 00:01:22.282337  | 0.0%           | 359,741     | 00:00:00
(10 rows)

~ ➤ heroku pg:blocking
 blocked_pid |    blocking_statement    | blocking_duration | blocking_pid |                                        blocked_statement                           | blocked_duration
-------------+--------------------------+-------------------+--------------+------------------------------------------------------------------------------------+------------------
         461 | select count(*) from app | 00:00:03.838314   |        15682 | UPDATE "app" SET "updated_at" = '2013-03-04 15:07:04.746688' WHERE "id" = 12823149 | 00:00:03.821826
(1 row)


~ ➤ heroku pg:pull DATABASE localdbname --app myapp
~ ➤ heroku pg:push localdbname DATABASE --app myapp

~ ➤ heroku pg:index-size

~ ➤ heroku pg:total-index-size
  size
-------
 28194 MB
(1 row)

~ ➤ heroku pg:index-size
                             name                              |  size
---------------------------------------------------------------+---------
 idx_activity_attemptable_and_type_lesson_enrollment           | 5196 MB
 index_enrollment_attemptables_by_attempt_and_last_in_group    | 4045 MB
 index_attempts_on_student_id                                  | 2611 MB
 enrollment_activity_attemptables_pkey                         | 2513 MB
 index_attempts_on_student_id_final_attemptable_type           | 2466 MB
 attempts_pkey                                                 | 2466 MB
 index_attempts_on_response_id                                 | 2404 MB
 index_attempts_on_enrollment_id                               | 1957 MB
 index_enrollment_attemptables_by_enrollment_activity_id       | 1789 MB
 enrollment_activities_pkey                                    |  458 MB
 index_enrollment_activities_by_lesson_enrollment_and_activity |  402 MB
 index_placement_attempts_on_response_id                       |  109 MB
 index_placement_attempts_on_placement_test_id                 |  108 MB
 index_placement_attempts_on_grade_level_id                    |   97 MB
 index_lesson_enrollments_on_lesson_id                         |   93 MB
(truncated results for brevity)

~ ➤ heroku pg:table-size
                             name                              |  size
---------------------------------------------------------------+---------
 learning_coaches                                              |  196 MB
 states                                                        |  145 MB
 grade_levels                                                  |  111 MB
 charities_customers                                           |   73 MB
 charities                                                     |   66 MB
(truncated results for brevity)

~ ➤ heroku pg:table-indexes-size
                             table                             | indexes_size
---------------------------------------------------------------+--------------
 learning_coaches                                              |    153 MB
 states                                                        |    125 MB
 charities_customers                                           |     93 MB
 charities                                                     |     16 MB
 grade_levels                                                  |     11 MB
(truncated results for brevity)

~ ➤ heroku pg:total-table-size
                             name                              |  size
---------------------------------------------------------------+---------
 learning_coaches                                              |  349 MB
 states                                                        |  270 MB
 charities_customers                                           |  166 MB
 grade_levels                                                  |  122 MB
 charities                                                     |   82 MB
(truncated results for brevity)

~ ➤ heroku pg:unused-indexes
          table      |                       index                | index_size | index_scans
---------------------+--------------------------------------------+------------+-------------
 public.grade_levels | index_placement_attempts_on_grade_level_id | 97 MB      |           0
 public.observations | observations_attrs_grade_resources         | 33 MB      |           0
 public.messages     | user_resource_id_idx                       | 12 MB      |           0
(3 rows)

~ ➤ heroku pg:seq-scans

               name                |  count
-----------------------------------+----------
 learning_coaches                  | 44820063
 states                            | 36794975
 grade_levels                      | 13972293
 charities_customers               |  8615277
 charities                         |  4316276
 messages                          |  3922247
 contests_customers                |  2915972
 classroom_goals                   |  2142014
 contests                          |  1370267
 goals                             |  1112659
 districts                         |   158995
 rollup_reports                    |   115942
 customers                         |    93847
 schools                           |    92984
 classrooms                        |    92982
 customer_settings                 |    91226
(truncated results for brevity)

~ ➤ heroku pg:long-running-queries

  pid  |    duration     |                                      query
-------+-----------------+---------------------------------------------------------------------------------------
 19578 | 02:29:11.200129 | EXPLAIN SELECT  "students".* FROM "students"  WHERE "students"."id" = 1450645 LIMIT 1
 19465 | 02:26:05.542653 | EXPLAIN SELECT  "students".* FROM "students"  WHERE "students"."id" = 1889881 LIMIT 1
 19632 | 02:24:46.962818 | EXPLAIN SELECT  "students".* FROM "students"  WHERE "students"."id" = 1581884 LIMIT 1
(truncated results for brevity)

~ ➤ heroku pg:bloat

 type  | schemaname |           object_name         | bloat |   waste
-------+------------+-------------------------------+-------+----------
 table | public     | bloated_table                 |   1.1 | 98 MB
 table | public     | other_bloated_table           |   1.1 | 58 MB
 index | public     | bloated_table::bloated_index  |   3.7 | 34 MB
 table | public     | clean_table                   |   0.2 | 3808 kB
 table | public     | other_clean_table             |   0.3 | 1576 kB

~ ➤ heroku pg:vacuum-stats
 schema |         table         | last_vacuum | last_autovacuum  |    rowcount    | dead_rowcount  | autovacuum_threshold | expect_autovacuum
--------+-----------------------+-------------+------------------+----------------+----------------+----------------------+-------------------
 public | log_table             |             | 2013-04-26 17:37 |         18,030 |              0 |          3,656       |
 public | data_table            |             | 2013-04-26 13:09 |             79 |             28 |             66       |
 public | other_table           |             | 2013-04-26 11:41 |             41 |             47 |             58       |
 public | queue_table           |             | 2013-04-26 17:39 |             12 |          8,228 |             52       | yes
 public | picnic_table          |             |                  |             13 |              0 |             53       |

~ ➤ heroku pg:mandelbrot

pg:upgrade

Upgrades your Production Tier Postgres database to the latest version

Usage

In short: heroku pg:upgrade A_FOLLOWER_HEROKU_POSTGRES_URL --app your_app

pg:upgrade is only for databases that cannot complete a dump and restore cycle through pg_dump/pg_restore or pgbackups:transfer. By using pg:upgrade, the checksum capabilities of Postgres 9.3 cannot be enabled for your database, a feature we highly recommend. pg:upgrade is not recommended for databases of size 20GB and below.

This command will only work on a follower, so that your main database is kept untouched, and so that it contains the most recent data possible. During the course of the upgrade, it will unfollow its parent and run the upgrade procedure. During the upgrade, you can use heroku pg:wait to track progress.

After the upgrade is done, check the data in the new database and make sure that everything still works. Then use heroku pg:promote to promote the upgraded database for your application. Leave the old one around until you're comfortable with the new database.

A typical upgrade procedure looks like so:

# Create a follower
heroku addons:add heroku-postgresql:<your-plan> --follow=MASTER_DATABASE_URL --app <your-app>
# Wait until it's cought up with the master
heroku pg:wait <new-database-color> --app <your-app>
# Put your app in maintenance mode
heroku maintenance:on --app <your-app>
# Upgrade the follower
heroku pg:upgrade HEROKU_POSTGRESQL_<new-database-color> --app <your-app>
# Wait until it completes upgrading
heroku pg:wait --app <your-app>
# Promote it, so your app now talks to this new database
heroku pg:promote HEROKU_POSTGRESQL_<new-database-color> --app <your-app>
# Remove maintenance mode
heroku maintenance:off --app <your-app>

We recommend you leave the original master for a few days, or until you're comfortable that the new database is working as expected. To remove the old database, simply remove the addon:

heroku addons:remove HEROKU_POSTGRESQL_<old-database-color> --app <your-app>

THIS IS BETA SOFTWARE

Thanks for trying it out. If you find any issues, please notify us at support@heroku.com

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