我在一台32GB ram的机器上运行
postgresql 9.3,交换0.最多可连接200个客户端.盒子上还有另外1个4GB进程.如何解释此错误日志消息？如何防止内存不足错误？允许交换？为机器添加更多内存？允许更少客户端连接？调整设置？
示例pg_top：
last pid: 6607; load avg: 3.59,2.32,2.61; up 16+09:17:29 20:49:51 113 processes: 1 running,111 sleeping,1 uninterruptable CPU states: 22.5% user,0.0% nice,4.9% system,63.2% idle,9.4% iowait Memory: 29G used,186M free,7648K buffers,23G cached DB activity: 2479 tps,1 rollbs/s,217 buffer r/s,99 hit%,11994 row r/s,3820 row w/s DB I/O: 0 reads/s,0 KB/s,0 writes/s,0 KB/s DB disk: 149.8 GB total,46.7 GB free (68% used) Swap:
示例顶部显示框中唯一的其他重要4GB进程：
top - 21:05:09 up 16 days,9:32,2 users,load average: 2.73,2.91,2.88 Tasks: 247 total,3 running,244 sleeping,0 stopped,0 zombie %Cpu(s): 22.1 us,4.1 sy,0.0 ni,62.9 id,9.8 wa,0.0 hi,0.7 si,0.3 st KiB Mem: 30827220 total,30642584 used,184636 free,7292 buffers KiB Swap: 0 total,0 used,0 free. 23449636 cached Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7407 postgres 20 0 7604928 10172 7932 S 29.6 0.0 2:51.27 postgres 10469 postgres 20 0 7617716 176032 160328 R 11.6 0.6 0:01.48 postgres 10211 postgres 20 0 7630352 237736 208704 S 10.6 0.8 0:03.64 postgres 18202 elastic+ 20 0 8726984 4.223g 4248 S 9.6 14.4 883:06.79 java 9711 postgres 20 0 7619500 354188 335856 S 7.0 1.1 0:08.03 postgres 3638 postgres 20 0 7634552 1.162g 1.127g S 6.6 4.0 0:50.42 postgres
postgresql.conf中：
max_connections = 1000 # (change requires restart) shared_buffers = 7GB # min 128kB work_mem = 40MB # min 64kB maintenance_work_mem = 1GB # min 1MB effective_cache_size = 20GB ....
日志：
ERROR: out of memory
DETAIL: Failed on request of size 67108864.
STATEMENT: SELECT "package_texts".* FROM "package_texts" WHERE "package_texts"."id" = $1 LIMIT 1
TopMemoryContext: 798624 total in 83 blocks; 11944 free (21 chunks); 786680 used
TopTransactionContext: 8192 total in 1 blocks; 7328 free (0 chunks); 864 used
Prepared Queries: 253952 total in 5 blocks; 136272 free (18 chunks); 117680 used
Type information cache: 24240 total in 2 blocks; 3744 free (0 chunks); 20496 used
Operator lookup cache: 24576 total in 2 blocks; 11888 free (5 chunks); 12688 used
TableSpace cache: 8192 total in 1 blocks; 3216 free (0 chunks); 4976 used
MessageContext: 8192 total in 1 blocks; 6976 free (0 chunks); 1216 used
Operator class cache: 8192 total in 1 blocks; 1680 free (0 chunks); 6512 used
smgr relation table: 24576 total in 2 blocks; 5696 free (4 chunks); 18880 used
TransactionAbortContext: 32768 total in 1 blocks; 32736 free (0 chunks); 32 used
Portal hash: 8192 total in 1 blocks; 1680 free (0 chunks); 6512 used
PortalMemory: 8192 total in 1 blocks; 7888 free (0 chunks); 304 used
PortalHeapMemory: 1024 total in 1 blocks; 568 free (0 chunks); 456 used
ExecutorState: 32928 total in 3 blocks; 15616 free (5 chunks); 17312 used
printtup: 34002024 total in 2 blocks; 7056 free (7 chunks); 33994968 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
Relcache by OID: 24576 total in 2 blocks; 12832 free (3 chunks); 11744 used
CacheMemoryContext: 1372624 total in 24 blocks; 38832 free (0 chunks); 1333792 used
CachedPlanSource: 7168 total in 3 blocks; 3080 free (1 chunks); 4088 used
CachedPlanQuery: 7168 total in 3 blocks; 2992 free (1 chunks); 4176 used
CachedPlanSource: 15360 total in 4 blocks; 7128 free (5 chunks); 8232 used
CachedPlanQuery: 15360 total in 4 blocks; 3320 free (1 chunks); 12040 used
CachedPlanSource: 3072 total in 2 blocks; 552 free (0 chunks); 2520 used
CachedPlanQuery: 7168 total in 3 blocks; 1592 free (1 chunks); 5576 used
CachedPlanSource: 3072 total in 2 blocks; 536 free (0 chunks); 2536 used
... 2 Thousand snipped lines of CachedPlans ...
CachedPlanSource: 15360 total in 4 blocks; 7128 free (5 chunks); 8232 used
CachedPlanQuery: 15360 total in 4 blocks; 3320 free (1 chunks); 12040 used
CachedPlanSource: 7168 total in 3 blocks; 3880 free (3 chunks); 3288 used
CachedPlanQuery: 7168 total in 3 blocks; 4032 free (1 chunks); 3136 used
CachedPlanSource: 7168 total in 3 blocks; 3936 free (3 chunks); 3232 used
CachedPlanQuery: 7168 total in 3 blocks; 4032 free (1 chunks); 3136 used
CachedPlanSource: 7168 total in 3 blocks; 3080 free (1 chunks); 4088 used
CachedPlanQuery: 7168 total in 3 blocks; 2992 free (1 chunks); 4176 used
CachedPlanSource: 7168 total in 3 blocks; 3872 free (2 chunks); 3296 used
CachedPlanQuery: 7168 total in 3 blocks; 4032 free (1 chunks); 3136 used
pg_toast_17305_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
index_package_raises_on_natural_key: 3072 total in 2 blocks; 1648 free (1 chunks); 1424 used
index_package_extensions_on_natural_key: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
index_package_mixins_on_natural_key: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
index_package_mixins_on_includes_id: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
package_texts_pkey: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
index_package_file_objects_on_natural_key: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
index_package_symbols_on_natural_key: 3072 total in 2 blocks; 1136 free (1 chunks); 1936 used
index_package_symbols_on_full_name: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
index_package_symbols_on_alias_for_id: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
package_symbols_pkey: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_toast_17313_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
index_packages_on_natural_key: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
packages_pkey: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
index_package_files_on_natural_key: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
package_files_pkey: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_toast_2619_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
index_projects_on_user_id: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
index_projects_on_type: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
index_projects_on_name_and_type: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
index_projects_on_claim_ticket: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
ruby_gem_metadata_pkey: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_constraint_contypid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_constraint_conrelid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_constraint_conname_nsp_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_attrdef_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_attrdef_adrelid_adnum_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_index_indrelid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_db_role_setting_databaseid_rol_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_opclass_am_name_nsp_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_foreign_data_wrapper_name_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_enum_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_class_relname_nsp_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_foreign_server_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_statistic_relid_att_inh_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_cast_source_target_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_language_name_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_collation_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_amop_fam_strat_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_index_indexrelid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_ts_template_tmplname_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_ts_config_map_index: 3072 total in 2 blocks; 1784 free (2 chunks); 1288 used
pg_opclass_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_foreign_data_wrapper_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_event_trigger_evtname_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_ts_dict_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_event_trigger_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_conversion_default_index: 3072 total in 2 blocks; 1784 free (2 chunks); 1288 used
pg_operator_oprname_l_r_n_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_trigger_tgrelid_tgname_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_enum_typid_label_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_ts_config_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_user_mapping_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_opfamily_am_name_nsp_index: 3072 total in 2 blocks; 1784 free (2 chunks); 1288 used
pg_foreign_table_relid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_type_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_aggregate_fnoid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_constraint_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_rewrite_rel_rulename_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_ts_parser_prsname_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_ts_config_cfgname_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_ts_parser_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_operator_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_namespace_nspname_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_ts_template_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_amop_opr_fam_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_default_acl_role_nsp_obj_index: 3072 total in 2 blocks; 1784 free (2 chunks); 1288 used
pg_collation_name_enc_nsp_index: 3072 total in 2 blocks; 1784 free (2 chunks); 1288 used
pg_range_rngtypid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_ts_dict_dictname_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_type_typname_nsp_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_opfamily_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_class_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_proc_proname_args_nsp_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_attribute_relid_attnum_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_proc_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_language_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_namespace_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_amproc_fam_proc_index: 3072 total in 2 blocks; 1736 free (2 chunks); 1336 used
pg_foreign_server_name_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_attribute_relid_attnam_index: 1024 total in 1 blocks; 16 free (0 chunks); 1008 used
pg_conversion_oid_index: 1024 total in 1 blocks; 200 free (0 chunks); 824 used
pg_user_mapping_user_server_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_conversion_name_nsp_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_authid_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_auth_members_member_role_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_tablespace_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_database_datname_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_auth_members_role_member_index: 1024 total in 1 blocks; 64 free (0 chunks); 960 used
pg_database_oid_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
pg_authid_rolname_index: 1024 total in 1 blocks; 152 free (0 chunks); 872 used
MdSmgr: 24576 total in 2 blocks; 13984 free (0 chunks); 10592 used
ident parser context: 0 total in 0 blocks; 0 free (0 chunks); 0 used
hba parser context: 7168 total in 3 blocks; 304 free (1 chunks); 6864 used
LOCALLOCK hash: 8192 total in 1 blocks; 1680 free (0 chunks); 6512 used
Timezones: 83472 total in 2 blocks; 3744 free (0 chunks); 79728 used
ErrorContext: 8192 total in 1 blocks; 8160 free (6 chunks); 32 used
如果我正确地读取你的顶部的输出,那么当你内存不足时就不会进行.
实际错误似乎很好 – 它没有请求大量的内存,因此可能是机器在那时没有内存.
我们来快速浏览一下您的设置：
max_connections = 1000 # (change requires restart) work_mem = 40MB # min 64kB
所以 – 您认为您可以支持1000个并发查询,每个使用10个40MB(有些可能使用40MB的倍数,但让我们合理).所以 – 这表明你的机器有> 500核心,说100GB的RAM.事实并非如此.
所以 – 获取核心数量并加倍 – 这是最大连接数的合理值.这将允许您对每个核心进行一次查询,而另一个正在等待I / O.然后,如果需要(pgbouncer / Java的连接池),请在DB前面放置一个连接池.
然后,如果需要,您甚至可以考虑增加work_mem.
哦 – 没有启用交换运行是完全合理的.一旦你开始交换,无论如何在数据库使用方面都处于痛苦的世界.
编辑：扩展work_mem vs shared
如有疑问,请始终参考documentation.
正如名称所示,shared_buffers值在后端之间共享. work_mem不仅是每个后端,它实际上是每种类型.所以 – 如果一个查询在三个子查询上进行排序,那么它可能会使用三到四倍的量.
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