Maximum Number of Concurrent Queries

Max Ganz II @ Redshift Observatory

3rd October 2021

Abstract
There is a limit of 30 concurrent queries per queue, regardless of the number of slots configured for a queue. When any queue has reached the limit of 30 concurrent queries, the superuser queue is no longer able to execute queries, but other user queues are unaffected.

Introduction

Redshift supports multiple concurrent queries.

The mechanism used to control and configure concurrent queries, both system-issued and user-issued, is that of queues and slots.

For users-issued queries, there can be from one to seven queues, each of which has one to fifty slots, and there is a system-wide maximum of fifty slots. The number of queues and how many slots are in each queue is configured by a system administrator.

Each slot can run one query (actually, a single slot can in the right circumstances run multiple queries, but that’s for a later white paper).

When a query is issued, a queue is selected (by means which are irrelevant to the investigation) and the query sent to that queue. If the queue has empty slots, one of them will be used to execute the query immediately. If all slots are occupied, the query goes into a FIFO queue for that queue, and will be executed once a slot becomes available.

There is then with Redshift a limit of fifty concurrent user-issued queries; fifty slots would be configured and fifty queries issued. At this point any additional user-issued queries would necessarily be queued.

This white paper investigates whether Redshift does in fact allow fifty user-issued queries to be executed concurrently.

Test Method

Proof #1 (1 queue 50 slots, 50 queries)

A Redshift cluster is configured to have one queue of 50 slots.

Two simple test tables are created, and then 50 identical queries are simultaneously issued, which select the count(*) of the join of the two tables. The tables contain a single raw encoded int8 column, with one exactly full block per slice of randomly generated int8, so the count is typically zero. Where there are so many slots, each slot has very little memory and even with only a single block per slice, the queries take a long time, about 30 minutes.

Once all 50 queries have been issued, we immediately issue a two queries into the superuser queue, the first being leader-node only, the second using worker-nodes.

We then note when every query was queued, when it began executing and when it finished executing.

We then examine the results to see what we find.

Proof #2 (1 queue 50 slots, 40 queries)

The same as proof #1, but now only 40 queries are issued.

Proof #3 (2 queues 30/10 slots, 30/10 queries)

Based on knowledge from the first proof, we now create two queues, of 30 slots and 10 slots (memory allocated pro rata).

Then as before 30 identical queries (still counting the join of the tables) are simultaneously issued, this time into the 30 slot queue, and then once they are all issued, 10 more identical queries as issued into the ten slot queue.

As before, we then immediately issue a two queries into the superuser queue, the first being leader-node only, the second using worker-nodes, and we then note when every query was queued, when it began executing and when it finished executing and examine the results to see what we find.

Proof #4 (2 queues 30/20 slots, 30/20 queries)

The same as proof #3, but now with 20 queries in the second queue, which has 20 queries issued.

Results

See Appendix A for the Python pprint dump of the results dictionary.

The Python script used to generate the results is available from the White Pages page at the Redshift Research Project. The script is user-friendly, self-contained, stand-alone and exists so that the results can simply and easily be reproduced.

Total test time was 8,095 seconds.

dc2.large, 2 nodes (1.0.30840)

Proof #1 (1 queue 50 slots, 50 queries)

Queue 6 is the single user-configured and default queue. All other queues are system queues.

Queue # Slots
1 1
2 1
3 2
4 1
5 1
6 50
15 0

All queries are reported as being queued and beginning to execute at the same time, but note the first 30 queries after about 33 minutes complete together, and then after another 20 minutes, the remaining 20 queries complete together (examine the execution end times for queries 30 and 31).

Query Queue Queue Start Exec Start Exec End
1 6 15:49:58.127771 15:49:58.127780 16:21:50.613780
2 6 15:49:58.070566 15:49:58.070609 16:21:50.615748
3 6 15:49:58.120498 15:49:58.120510 16:21:50.617066
4 6 15:49:58.210868 15:49:58.210878 16:21:50.642211
5 6 15:49:58.160839 15:49:58.160847 16:21:50.671250
6 6 15:49:58.062473 15:49:58.062483 16:21:50.710787
7 6 15:49:58.089557 15:49:58.089566 16:21:50.755797
8 6 15:49:57.835326 15:49:57.835334 16:21:50.770947
9 6 15:49:58.232241 15:49:58.232252 16:21:50.823570
10 6 15:49:58.132214 15:49:58.132222 16:21:50.855381
11 6 15:49:58.087055 15:49:58.087063 16:21:50.887268
12 6 15:49:58.051477 15:49:58.051487 16:21:53.884859
13 6 15:49:58.259194 15:49:58.259203 16:21:54.227551
14 6 15:49:58.117327 15:49:58.117336 16:21:54.585056
15 6 15:49:58.263676 15:49:58.263683 16:21:54.848468
16 6 15:49:58.122405 15:49:58.158070 16:21:55.096476
17 6 15:49:58.071046 15:49:58.071056 16:21:56.054904
18 6 15:49:57.829600 15:49:57.829612 16:21:56.435633
19 6 15:49:58.184733 15:49:58.184741 16:21:58.094943
20 6 15:49:58.274706 15:49:58.274714 16:21:58.710918
21 6 15:49:58.086042 15:49:58.086050 16:21:59.336118
22 6 15:49:58.183266 15:49:58.183278 16:21:59.395178
23 6 15:49:58.181344 15:49:58.181354 16:21:59.635844
24 6 15:49:58.045031 15:49:58.045051 16:22:00.307921
25 6 15:49:58.132691 15:49:58.132699 16:22:00.427576
26 6 15:49:58.227170 15:49:58.227183 16:22:00.658998
27 6 15:49:58.219830 15:49:58.219837 16:22:01.937114
28 6 15:49:58.190592 15:49:58.190610 16:22:03.198462
29 6 15:49:58.078237 15:49:58.078245 16:22:03.220855
30 6 15:49:58.200588 15:49:58.200595 16:22:04.820606
31 6 15:49:58.243559 15:49:58.243568 16:42:11.351617
32 6 15:49:58.196226 15:49:58.196232 16:42:11.936405
33 6 15:49:58.215345 15:49:58.215358 16:42:18.099604
34 6 15:49:58.213584 15:49:58.213594 16:42:18.491249
35 6 15:49:58.217188 15:49:58.217199 16:42:18.510718
36 6 15:49:58.294468 15:49:58.294476 16:42:20.603540
37 6 15:49:58.282827 15:49:58.282834 16:42:20.604723
38 6 15:49:58.278099 15:49:58.278107 16:42:21.234185
39 6 15:49:58.215968 15:49:58.215977 16:42:21.551156
40 6 15:49:58.154419 15:49:58.154426 16:42:21.603266
41 6 15:49:58.224768 15:49:58.224776 16:42:21.651115
42 6 15:49:58.287855 15:49:58.287862 16:42:23.474200
43 6 15:49:58.425462 15:49:58.425469 16:42:23.685237
44 6 15:49:58.262150 15:49:58.262157 16:42:23.934793
45 6 15:49:58.278275 15:49:58.278281 16:42:24.114984
46 6 15:49:58.262670 15:49:58.262681 16:42:24.856536
47 6 15:49:58.354781 15:49:58.354789 16:42:26.005504
48 6 15:49:58.416414 15:49:58.416423 16:42:26.258593
49 6 15:49:58.419910 15:49:58.419917 16:42:26.276310
50 6 15:49:58.416569 15:49:58.416576 16:42:26.483855

The following single row table is the superuser queue leader-node query issued immediately after the 50 queries were issued.

It appears currently no logging of completed leader-node queries is occurring (it used to) and so all we have is the timestamp from the timeofday() function, which was issued in the query. This is however adequate to show when execution occurred.

timeofday()
Mon Oct 04 15:50:02.432721 2021 UTC

The following single row table is the superuser queue worker-node query issued immediately after leader-node query completed. We see it only finally executed once one or more of the initial batch of 30 queries completed.

Queue # Queue Start Exec Start timeofday() Exec End
5 15:50:02.481307 15:50:02.481321 Mon Oct 04 16:21:50.898244 2021 UTC 16:21:50.898769

Proof #2 (1 queue 50 slots, 40 queries)

Queue # Slots
1 1
2 1
3 2
4 1
5 1
6 50
15 0

Here we issued only 40 queries. As before, we see a first batch of 30 completing together, and then the final batch of 10 completing together.

Query # Queue # Queue Start Exec Start Exec End
1 6 16:43:56.785943 16:43:56.785951 17:14:54.546982
2 6 16:43:56.990794 16:43:56.990802 17:15:13.130696
3 6 16:43:56.932712 16:43:56.932726 17:15:14.538681
4 6 16:43:57.101137 16:43:57.101143 17:15:42.708895
5 6 16:43:56.792195 16:43:56.792205 17:15:43.101332
6 6 16:43:57.087052 16:43:57.087060 17:15:44.954837
7 6 16:43:56.643655 16:43:56.643979 17:15:46.211009
8 6 16:43:56.990043 16:43:56.990052 17:15:46.500821
9 6 16:43:56.997153 16:43:56.997821 17:15:46.946331
10 6 16:43:56.783937 16:43:56.783947 17:15:47.163977
11 6 16:43:57.099557 16:43:57.099564 17:15:47.438160
12 6 16:43:57.090594 16:43:57.090603 17:15:47.732970
13 6 16:43:56.943640 16:43:56.943649 17:15:47.737157
14 6 16:43:57.065514 16:43:57.065521 17:15:47.739972
15 6 16:43:57.077606 16:43:57.077625 17:15:47.856719
16 6 16:43:56.890170 16:43:56.890181 17:15:48.003832
17 6 16:43:57.049426 16:43:57.049434 17:15:48.910747
18 6 16:43:56.641216 16:43:56.641229 17:15:49.269827
19 6 16:43:56.867961 16:43:56.867989 17:15:49.288471
20 6 16:43:57.036741 16:43:57.036749 17:15:51.362420
21 6 16:43:56.631125 16:43:56.631135 17:15:51.563885
22 6 16:43:57.079126 16:43:57.079139 17:15:51.840308
23 6 16:43:57.041135 16:43:57.041149 17:15:51.958705
24 6 16:43:57.022074 16:43:57.022085 17:15:51.998679
25 6 16:43:56.988643 16:43:56.988656 17:15:52.021174
26 6 16:43:56.998370 16:43:56.998380 17:15:52.077485
27 6 16:43:57.025380 16:43:57.025387 17:15:52.114683
28 6 16:43:56.990945 16:43:56.990951 17:15:54.020131
29 6 16:43:57.067723 16:43:57.067731 17:15:54.785593
30 6 16:43:57.063241 16:43:57.063250 17:15:55.953745
31 6 16:43:57.118359 16:43:57.118365 17:25:36.035945
32 6 16:43:57.155690 16:43:57.155698 17:25:45.103205
33 6 16:43:57.121212 16:43:57.121219 17:25:45.825897
34 6 16:43:57.167407 16:43:57.167415 17:25:46.036079
35 6 16:43:57.121998 16:43:57.125695 17:25:48.425447
36 6 16:43:57.146333 16:43:57.146338 17:25:48.902028
37 6 16:43:57.160894 16:43:57.160901 17:25:49.069143
38 6 16:43:57.146171 16:43:57.146180 17:25:49.130059
39 6 16:43:57.161057 16:43:57.161063 17:25:49.499375
40 6 16:43:57.157965 16:43:57.157972 17:25:49.911973

The following single row table is the superuser queue leader-node query issued immediately after the 50 queries were issued.

It appears currently no logging of completed leader-node queries is occurring (it used to) and so all we have is the timestamp from the timeofday() function, which was issued in the query. This is however adequate to show when execution occurred.

timeofday()
Mon Oct 04 16:44:01.546710 2021 UTC

The following single row table is the superuser queue worker-node query issued immediately after leader-node query completed. Here we see the query as before only executed once queries from the first 30 queries completed.

Queue # Queue Start Exec Start timeofday() Exec End
5 16:44:01.594764 16:44:01.594776 Mon Oct 04 16:21:50.898244 2021 UTC 17:14:54.548745

Proof #3 (2 queues 30/10 slots, 30/10 queries)

Queue # Slots
1 1
2 1
3 2
4 1
5 1
6 10
7 30
15 0

The 30 queries to queue #7 were issued first (examine the Queue Start timestamps), followed by the 10 queries into queue #6.

Here we see all queries actually executed in parallel; they all begin at about the same time and all ended at about the same time; they ran in parallel.

Query # Queue # Queue Start Exec Start Exec End
1 7 17:29:10.116657 17:29:10.116666 17:41:57.179292
2 7 17:29:10.152597 17:29:10.152608 17:41:49.509474
3 7 17:29:10.159927 17:29:10.159936 17:41:48.999495
4 7 17:29:10.210375 17:29:10.210384 17:41:49.683588
5 7 17:29:10.213187 17:29:10.213194 17:41:58.276473
6 7 17:29:10.235929 17:29:10.235939 17:41:58.284404
7 7 17:29:10.254439 17:29:10.254448 17:41:50.098457
8 7 17:29:10.296682 17:29:10.296692 17:41:49.919376
9 7 17:29:10.324581 17:29:10.324590 17:41:58.246735
10 7 17:29:10.328897 17:29:10.328904 17:41:58.341320
11 7 17:29:10.358083 17:29:10.358092 17:41:50.165056
12 7 17:29:10.363645 17:29:10.363653 17:41:50.077641
13 7 17:29:10.365459 17:29:10.365467 17:41:58.239877
14 7 17:29:10.368713 17:29:10.368720 17:41:50.164706
15 7 17:29:10.411387 17:29:10.411397 17:41:50.118964
16 7 17:29:10.411742 17:29:10.411748 17:41:58.312306
17 7 17:29:10.417405 17:29:10.417412 17:41:52.788602
18 7 17:29:10.448896 17:29:10.448909 17:41:58.340954
19 7 17:29:10.449213 17:29:10.449220 17:41:58.366137
20 7 17:29:10.451035 17:29:10.451046 17:41:58.266653
21 7 17:29:10.452813 17:29:10.452823 17:41:58.129337
22 7 17:29:10.461381 17:29:10.461389 17:41:58.257869
23 7 17:29:10.461546 17:29:10.461554 17:41:50.103795
24 7 17:29:10.462643 17:29:10.462651 17:41:58.252911
25 7 17:29:10.489043 17:29:10.489051 17:41:55.676683
26 7 17:29:10.508213 17:29:10.508222 17:41:52.912922
27 7 17:29:10.524630 17:29:10.524637 17:41:55.929408
28 7 17:29:10.525336 17:29:10.525354 17:41:52.015737
29 7 17:29:10.584906 17:29:10.584913 17:41:50.928450
30 7 17:29:10.590228 17:29:10.590234 17:41:51.585367
31 6 17:29:15.139446 17:29:15.139459 17:41:58.368530
32 6 17:29:15.146818 17:29:15.146829 17:41:56.844642
33 6 17:29:15.149278 17:29:15.149286 17:41:58.521654
34 6 17:29:15.151224 17:29:15.151233 17:41:58.817737
35 6 17:29:15.151487 17:29:15.151497 17:41:58.370361
36 6 17:29:15.155440 17:29:15.156011 17:41:55.992180
37 6 17:29:15.187292 17:29:15.187304 17:41:58.621754
38 6 17:29:15.187804 17:29:15.187814 17:41:55.308719
39 6 17:29:15.189784 17:29:15.189792 17:41:54.085506
40 6 17:29:15.193096 17:29:15.193103 17:41:56.972871

The following single row table is the superuser queue leader-node query issued immediately after the 50 queries were issued.

It appears currently no logging of completed leader-node queries is occurring (it used to) and so all we have is the timestamp from the timeofday() function, which was issued in the query. This is however adequate to show when execution occurred.

timeofday()
Mon Oct 04 17:29:15.046693 2021 UTC

The following single row table is the superuser queue worker-node query issued immediately after leader-node query completed. Here we see this query executed immediately; it was not blocked.

Queue # Queue Start Exec Start timeofday() Exec End
5 17:29:15.181314 17:29:15.181327 Mon Oct 04 17:29:15.223939 2021 UTC 17:29:15.231921

Proof #4 (2 queues 30/20 slots, 30/20 queries)

Queue # Slots
1 1
2 1
3 2
4 1
5 1
6 20
7 30
15 0

Finally, to check that even with 50 queries, as long as they’re spread over multiple queues, execution is fully parallel, this 30/20 proof. We see here that all queries began at about the same time and ended at about the same time; they really did run in parallel.

Query # Queue # Queue Start Exec Start Exec End
1 7 17:45:40.508312 17:45:40.508322 18:01:41.512858
2 7 17:45:40.565982 17:45:40.565995 18:01:23.100758
3 7 17:45:40.608091 17:45:40.608103 18:01:23.720642
4 7 17:45:40.663260 17:45:40.663291 18:01:42.685471
5 7 17:45:40.674131 17:45:40.674140 18:01:42.632185
6 7 17:45:40.681154 17:45:40.681164 18:01:42.484303
7 7 17:45:40.717998 17:45:40.718013 18:01:42.171824
8 7 17:45:40.726040 17:45:40.726051 18:01:42.272628
9 7 17:45:40.726193 17:45:40.726200 18:01:24.175341
10 7 17:45:40.746223 17:45:40.746232 18:01:42.579424
11 7 17:45:40.753393 17:45:40.753400 18:01:42.687405
12 7 17:45:40.756592 17:45:40.756601 18:01:26.416616
13 7 17:45:40.760058 17:45:40.760067 18:01:24.048386
14 7 17:45:40.761097 17:45:40.761106 18:01:42.580756
15 7 17:45:40.761158 17:45:40.761321 18:01:24.080262
16 7 17:45:40.747651 17:45:40.762795 18:01:24.112432
17 7 17:45:40.760882 17:45:40.764710 18:01:42.648259
18 7 17:45:40.764762 17:45:40.764771 18:01:23.920977
19 7 17:45:40.768682 17:45:40.768691 18:01:42.471272
20 7 17:45:40.778725 17:45:40.778736 18:01:42.664954
21 7 17:45:40.778944 17:45:40.778952 18:01:23.964037
22 7 17:45:40.783861 17:45:40.783869 18:01:23.816765
23 7 17:45:40.791753 17:45:40.791760 18:01:40.880951
24 7 17:45:40.792762 17:45:40.792769 18:01:41.372720
25 7 17:45:40.795472 17:45:40.795479 18:01:42.455657
26 7 17:45:40.894647 17:45:40.894656 18:01:23.948445
27 7 17:45:40.895070 17:45:40.895079 18:01:34.244923
28 7 17:45:40.911679 17:45:40.911690 18:01:42.376488
29 7 17:45:40.911803 17:45:40.911812 18:01:42.705763
30 7 17:45:40.917010 17:45:40.917016 18:01:24.320836
31 6 17:45:45.596045 17:45:45.596060 18:01:41.684372
32 6 17:45:45.606666 17:45:45.606677 18:01:40.760743
33 6 17:45:45.608494 17:45:45.608501 18:01:43.120154
34 6 17:45:45.627556 17:45:45.627565 18:01:42.940785
35 6 17:45:45.632816 17:45:45.632827 18:01:39.921029
36 6 17:45:45.647367 17:45:45.647376 18:01:43.102451
37 6 17:45:45.652132 17:45:45.652139 18:01:29.509487
38 6 17:45:45.665223 17:45:45.665234 18:01:30.024999
39 6 17:45:45.671703 17:45:45.671710 18:01:42.976345
40 6 17:45:45.671790 17:45:45.671797 18:01:29.632491
41 6 17:45:45.675316 17:45:45.675324 18:01:29.544447
42 6 17:45:45.683275 17:45:45.683283 18:01:42.579789
43 6 17:45:45.683556 17:45:45.683562 18:01:29.850047
44 6 17:45:45.711906 17:45:45.711915 18:01:30.019516
45 6 17:45:45.712075 17:45:45.712082 18:01:29.967331
46 6 17:45:45.715886 17:45:45.715894 18:01:40.505223
47 6 17:45:45.721388 17:45:45.721397 18:01:34.643008
48 6 17:45:45.722392 17:45:45.722399 18:01:29.714263
49 6 17:45:45.728650 17:45:45.728658 18:01:35.295424
50 6 17:45:45.729012 17:45:45.729022 18:01:37.573317

The following single row table is the superuser queue leader-node query issued immediately after the 50 queries were issued.

It appears currently no logging of completed leader-node queries is occurring (it used to) and so all we have is the timestamp from the timeofday() function, which was issued in the query. This is however adequate to show when execution occurred.

timeofday()
Mon Oct 04 17:45:45.476594 2021 UTC

The following single row table is the superuser queue worker-node query issued immediately after leader-node query completed. The query was not blocked.

Queue # Queue Start Exec Start timeofday() Exec End
5 17:45:45.736648 17:45:45.736655 Mon Oct 04 17:45:46.532921 2021 UTC 17:45:46.533540

Discussion

Proof #1 (1 queue 50 slots, 50 queries)

With a single 50 slot queue, we can see all 50 queries queued and began execution at about the same time, 15:49:58, but that they did not in fact actually all execute in parallel.

The first 30 queries ran and completed at about 16:21:50, as can be seen in their “Exec End” timestamps, taking about 32 minutes to run.

The outstanding 20 queries however completed at about 16:42:20 - 21 minutes later.

The explanation here is that the first 30 queries were running while the second 20 queries were not, and then when the first 30 finished, the second 20 queries than actually began to ran, and finished about 20 minutes later, which fits - if 30 queries take about 30 minutes to run, then 20 queries will take about 2/3rds of the time, which is 20 minutes).

This means the start execution time listed in the system tables is basically bogus. It does not mean a query is actually executing.

Returning to the test, once all 50 queries has been issued, a leader-node only query was issued to the superuser queue. This completed immediately.

Then a worker-node query was issued the superuser queue, this at 15:50:02.

This query was blocked until the first batch of 30 queries began to complete, and then it finally was able to complete at 16:21:50 (the time the second batch of 20 queries were able also to begin executing).

Proof #2 (1 queue 50 slots, 40 queries)

This proof is identical to proof #1, except 40 queries are issued rather than 50.

We expect then to see the first 30 execute and when they have completed, the final 10 queries execute, and this what is seen.

As before, the superuser queue leader-only query executed immediately, but the superuser queue work-node-using query was blocked.

Proof #3 (2 queues 30/10 slots, 30/10 queries)

This proof has two queues, one of 30 slots and one of 10.

The first queue of 30 slots has 30 identical queries issued to it; once this has been done, 10 identical queries are issued to the second queue.

What we find now is that all these queries actually really do execute in parallel, and that the superuser queries are not blocked.

Proof #3 (2 queues 30/20 slots, 30/20 queries)

Identical to proof #3, except now with 20 slots and queries in the second queue, to reach the 50 slot limit.

However, this does not change the results : all queries really did execute in parallel, and the superuser queries were not blocked.

Review

So what do we make of this?

First, it looks like there is for any single queue an actual limit of 30 concurrent queries, regardless of how many slots are configured, and the reporting in the system tables of the timestamp of when a query begins execution is bogus (the systems tables are a disaster area, and this is more of the same).

Regarding this limit, it’s always a good idea to keep queue configuration simple; any fancy queue configuration in my view is never going to be doing what the admin thinks it’s doing. This mitigates in favour of few or even single queues, with lots of slots. Queries which use merge joins, which is to say, well designed queries with matching well designed tables, require practically no memory and so in a situation where these are the queries being issued, you can have lots of slots - you don’t need the usual buckets of memory to make hash joins performant. In this case this 30 query limit could be a problem, which seems a bit cruel - it’s hitting the people who are operating Redshift correctly.

In my experience though, every client I’ve worked with has been operating Redshift incorrectly, and so needs plenty of slot memory to handle their hash joins, but at the same time have no awareness of this need at all, and so they tend to have some sort of semi-randomly selected queue configuration which has never been examined for actual impact or performance, because queries are executing and it all seems to work (despite end-users complaining that performance is poor and erratic).

Second, it looks like (and this is pretty odd) that if there is a single queue which has reached the 30 concurrent query limit, the superuser queue - but not other normal user queues, as we’ve seen in proof #3 - can no longer execute queries which use worker nodes.

I think leader-node only queries continue to execute as normal because they do not in fact use WLM queues at all, and so do not in fact pay attention to query_group.

The superuser queue is there at least in part to allow admin to always be able to issue commands, to recover a cluster, no matter what state the cluster is in, so if this is true, it’s a significant and unexpected issue.

I’ve not yet experimented to find out, but my expectation is that anything relating to queries - enumerating queries, cancelling processes, etc, would be leader-node only, but anything which touches normal Redshift tables in any way, such as dropping tables or truncating them, would not be.

Conclusions

There is a limit of 30 concurrent queries per queue, regardless of the number of slots configured in a queue.

Once any one queue reaches its limit of 30 concurrent queries, the superuser queue is no longer able to execute queries.

However, other user queues are not affected, and continue to accept and execute queries normally.

(Note leader-node only queries continue to execute as normal, I think because they do not use WLM queues and so cannot be blocked by anything going on in WLM.)

Unexpected Findings

When you investigate Redshift, there are always unexpected findings.

  1. Completed leader-node only queries now appear not to be logged at all. I think (from memory and from the code of expensively created existing views which show the complete query history) they used to show up in STL_QUERY.

Revision History

v1

v2

v3

v4

v5

Fixed a typo, where a word was accidentally repeated (“we we”, rather than “we”).

v6

v7

v8

v9

Appendix A : Raw Data Dump

Note these results are completely unprocessed; they are a raw dump of the results, so the original, wholly unprocessed data, is available.

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                              '1_queue_40_slots_superuser_leader_node': [['Mon '
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 'tests': {'dc2.large': {2: {}}},
 'versions': {'dc2.large': {2: 'PostgreSQL 8.0.2 on i686-pc-linux-gnu, '
                               'compiled by GCC gcc (GCC) 3.4.2 20041017 (Red '
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