每当在 postgres 进程上调用 OOM killer 时，数据库就会进入恢复模式。
与该问题相关的 /var/log/messages 输出
oom-kill：constraint=CONSTRAINT_NONE、nodemask=(null)、cpuset=/、mems_allowed=0、global_oom、task_memcg=/user.slice/user-0.slice/session-137004.scope、task=postgres、pid=4193383、uid=1001 3 月 25 日 15:55:21 内核：内存不足：已终止进程 4193383 (postgres) total-vm：13226668kB、anon-rss：172912kB、file-rss：4kB、shmem-rss：10194068kB、UID：1001
postgres 记录与该问题相关的输出
postgresql 日志 FATAL 错误：postgresql-2021-03-25_000000.log:2021-03-25 15:55:26 IST [54678]: [1-1] [未知] 10.10.10.10。db=dbname，user=username FATAL：数据库系统处于恢复模式
sysctl -a 命令输出
vm.drop_caches = 3 vm.extfrag_threshold = 500 vm.hugetlb_shm_group = 0 vm.laptop_mode = 0 vm.legacy_va_layout = 0 vm.lowmem_reserve_ratio = 256 256 32 0 0 vm.max_map_count = 65530 vm.memory_failure_early_kill = 0 vm.memory_failure_recovery = 1 vm.min_free_kbytes = 67584 vm.min_slab_ratio = 5 vm.min_unmapped_ratio = 1 vm.mmap_min_addr = 4096 vm.mmap_rnd_bits = 28 vm.mmap_rnd_compat_bits = 8 vm.nr_hugepages = 0 vm.nr_hugepages_mempolicy = 0 vm.nr_overcommit_hugepages = 0 vm.numa_stat = 1 vm.numa_zonelist_order = 节点 vm.oom_dump_tasks = 1 vm.oom_kill_allocating_task = 0 vm.overcommit_kbytes = 0 vm.overcommit_memory = 0 vm.overcommit_ratio = 50 vm.page-cluster = 3 vm.panic_on_oom = 0 vm.percpu_pagelist_fraction = 0 vm.stat_interval = 1 vm.swappiness = 30 vm.user_reserve_kbytes = 131072 vm.vfs_cache_pressure = 100 vm.watermark_scale_factor = 10 vm.zone_reclaim_mode = 0
需要了解这里到底是什么原因导致了这个问题吗？