Postgresql Copy Failed Error Out Of Memory
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Postgres Out Of Memory For Query Result
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answer The best answers are voted up and rise to the top PostgreSQL Error: out of memory up vote 2 down vote favorite I'm trying to run a query that should return around 2000 rows, but my RDS-hosted PostgreSQL 9.3 database is giving me the error "out of memory DETAIL: Failed on request of size 2048.". What does that mean? My instance has 3GB of memory, so what would be limiting it psycopg2 databaseerror out of memory for query result enough to run out of memory with such a small query? Edit: SHOW work_mem; "1024GB" I can't show the full SQL, but it's attempting to perform a pivot. I have two primary tables, library and book, which points back to a library record. My query attempts to find the most popular book for each of the last 12 months for each library record, and join them to a separate column in the result queryset, to have something like: library_id, month_1_book_id, month_2_book_id, month_3_book_id, ... Explain shows this results in quite a few loops: explain select * from myapp_library_get_monthly_popular where id in (5495060, 5495059, 5495048) Nested Loop Left Join (cost=3645798.54..3750412.91 rows=3 width=2980) -> Nested Loop Left Join (cost=3645798.10..3750388.98 rows=3 width=2994) -> Nested Loop Left Join (cost=3645797.66..3750365.05 rows=3 width=2976) -> Nested Loop Left Join (cost=3645797.23..3750341.13 rows=3 width=2958) -> Nested Loop Left Join (cost=3645796.79..3750317.20 rows=3 width=2940) -> Nested Loop Left Join (cost=3645796.35..3750293.27 rows=3 width=2922) -> Nested Loop Left Join (cost=3645795.91..3750269.35 rows=3 width=2904) -> Nested Loop Left Join (cost=3645795.48..3750245.42 rows=3 width=2886) -> Nested Loop Left Join (cost=3645795.04..3750221.49 rows=3 width=2868) -> Nested Loop Left Join (cost=3645794.60..3750197.57 rows=3 width=2850) -> Nested Loop Left Join (cost=3645794.16..3750173.64 rows=3 width=2832) -> Nested Loop Left Join (cost=3645793.73..3750149.71 rows=3 width=2814) -> Hash Join (cost=3645793.29..3750125.79 rows=3 width=2796) Hash Cond: (c.category_id = ct.id) -> Hash Join (cost=3645792.24..375
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow http://stackoverflow.com/questions/29485644/postgres-gets-out-of-memory-errors-despite-having-plenty-of-free-memory the company Business Learn more about hiring developers or posting ads with us Stack http://grokbase.com/t/postgresql/pgsql-general/076ep3wbxj/pg-restore-out-of-memory Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Postgres gets out of memory errors despite having plenty of free memory up vote 11 down vote out of favorite 2 I have a server running Postgres 9.1.15. The server has 2GB of RAM and no swap. Intermittently Postgres will start getting "out of memory" errors on some SELECTs, and will continue doing so until I restart Postgres or some of the clients that are connected to it. What's weird is that when this happens, free still reports over 500MB of free memory. select version();: PostgreSQL 9.1.15 on x86_64-unknown-linux-gnu, compiled by out of memory gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, 64-bit uname -a: Linux db 3.2.0-23-virtual #36-Ubuntu SMP Tue Apr 10 22:29:03 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Postgresql.conf (everything else is commented out/default): max_connections = 100 shared_buffers = 500MB work_mem = 2000kB maintenance_work_mem = 128MB wal_buffers = 16MB checkpoint_segments = 32 checkpoint_completion_target = 0.9 random_page_cost = 2.0 effective_cache_size = 1000MB default_statistics_target = 100 log_temp_files = 0 I got these values from pgtune (I chose "mixed type of applications") and have been fiddling with them based on what I've read, without making much real progress. At the moment there's 68 connections, which is a typical number (I'm not using pgbouncer or any other connection poolers yet). /etc/sysctl.conf: kernel.shmmax=1050451968 kernel.shmall=256458 vm.overcommit_ratio=100 vm.overcommit_memory=2 I first changed overcommit_memory to 2 about a fortnight ago after the OOM killer killed the Postgres server. Prior to that the server had been running fine for a long time. The errors I get now are less catastrophic but much more annoying because they are much more frequent. I haven't had much luck pinpointing the first event that causes postgres to run "out of memory" - it seems to be different each time. The most recent time it crashed, the first three lines logged were: 2015-04-07 05:32:39 UTC ERROR: out of memory 2015-04-07 05:32:39 UTC DETAIL: F
pg_dump -Fcpg_dump on a postgreql 8.1.4 machinepg_restore on a postgresql 8.2.4 machine.The restore machine has the following settings./etc/sysctl.conf (FreeBSD machine)kern.ipc.shmall=262144kern.ipc.shmmax=534773760 #510MBkern.ipc.semmap=256/boot/loader.confkern.ipc.semmni=256kern.ipc.semmns=512kern.ipc.semmnu=256kern.maxdsiz="1600MB" #1.6GBkern.dfldsiz="1600MB" #1.6GBkern.maxssiz="128M" # 128MBshared_buffers = 450MBtemp_buffers = 8MBwork_mem = 8MB # min 64kBmaintenance_work_mem = 64Mmax_fsm_pages = 5000000 #Had error with 100,000 and increasedto 5Million while trying the pg_restoreOS can see 3.5GB of RAM.Swap is 20GB.The error that I got was:pg_restore: [archiver (db)] Error from TOC entry 2146; 0 988154 TABLE DATAmessage_attachments pgsqlpg_restore: [archiver (db)] COPY failed: ERROR: out of memoryDETAIL: Failed on request of size 134217728 (128MB)Syslog was:Jun 14 10:17:56 bk20 postgres[7294]: [130-1] ERROR: out of memoryJun 14 10:17:56 bk20 postgres[7294]: [130-2] DETAIL: Failed on request of size 134217728.I see a simmilar thread back in December 2006.http://tinyurl.com/3aa29gHowever i don't see a final resolution.Which parameter do I need to increase? reply Tweet Search Discussions Search All Groups PostgreSQL pgsql-general 42 responses Oldest Nested Tom Lane Can we see the context-sizes dump that should've come out right before that in the log? regards, tom lane Tom Lane at Jun 14, 2007 at 8:43 pm ⇧ Francisco Reyes writes:Syslog was:Jun 14 10:17:56 bk20 postgres[7294]: [130-1] ERROR: out of memoryJun 14 10:17:56 bk20 postgres[7294]: [130-2] DETAIL: Failed on request of size 134217728.Can we see the context-sizes dump that should've come out right beforethat in the log?regards, tom lane reply | permalink Francisco Reyes Is this the one you need? Is was right after the error Jun 14 10:17:56 bk20 postgres[7294]: [130-3] CONTEXT: COPY message_attachments, line 60490: "2720290 7225017 research/crew holds.sit sit 88885753 t 1 Jun 14 10:17:56 bk20 postgres[7294]: [130-4] U3R1ZmZJdCAoYykxOTk3LTIwMDIgQWxhZGRpbiBTeX..." Jun 14 10:17:56 bk20 postgres[7294]: [130-5] STATEMENT: COPY message_attachments (attachment_id, message_id, filename, extension, attachment_size, name_real, Jun 14 10:17:56 bk20 postgres[7294]: [130-6] Francisco Reyes at Jun 14, 2007 at 10:10 pm ⇧ Tom Lane writes:Francisco Reyes