之前服务器用 了10来天后 每天12点15就死机
我以为是服务器问题，就换了台服务器，10来天后又出现同样的问题，晚上12点15就准时卡死
重装PGSQL还原之前备份后不再卡死（10天后不敢保证，date还原后小了10G。原来是27G还原后变17G）
发现每天12点15出现这样的日志
（重装PGSQL后不卡死排除服务器问题。服务器配置是独立服务器16核16G，我这开多个JAVA采集。正常情况是CPU5%以内，内存使用8-10GB,句柄有点高到10W,线程2000，进程250，PGSQl连接150）
2019-12-15 00:15:39 HKT LOG: checkpoints are occurring too frequently (21 seconds apart)
2019-12-15 00:15:39 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-15 00:15:54 HKT LOG: checkpoints are occurring too frequently (15 seconds apart)
2019-12-15 00:15:54 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-15 00:16:09 HKT LOG: checkpoints are occurring too frequently (15 seconds apart)
2019-12-15 00:16:09 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-14 00:15:22 HKT LOG: checkpoints are occurring too frequently (22 seconds apart)
2019-12-14 00:15:22 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-14 00:15:38 HKT LOG: checkpoints are occurring too frequently (16 seconds apart)
2019-12-14 00:15:38 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-14 00:15:51 HKT LOG: checkpoints are occurring too frequently (13 seconds apart)
2019-12-14 00:15:51 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-14 00:23:26 HKT ERROR: value too long for type character varying(50)
2019-12-13 00:15:07 HKT LOG: checkpoints are occurring too frequently (7 seconds apart)
2019-12-13 00:15:07 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-13 00:15:18 HKT LOG: checkpoints are occurring too frequently (11 seconds apart)
2019-12-13 00:15:18 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-13 00:15:34 HKT LOG: checkpoints are occurring too frequently (16 seconds apart)
2019-12-13 00:15:34 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-13 00:15:40 HKT LOG: checkpoints are occurring too frequently (6 seconds apart)
2019-12-13 00:15:40 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
2019-12-13 00:16:06 HKT LOG: checkpoints are occurring too frequently (26 seconds apart)
2019-12-13 00:16:06 HKT HINT: Consider increasing the configuration parameter "checkpoint_segments".
下面是我的配置
#wal_level = minimal # minimal, archive, or hot_standby
# (change requires restart)
#fsync = on # turns forced synchronization on or off
#synchronous_commit = on # synchronization level;
# off, local, remote_write, or on
#wal_sync_method = fsync # the default is the first option
# supported by the operating system:
# open_datasync
# fdatasync (default on Linux)
# fsync
# fsync_writethrough
# open_sync
#full_page_writes = on # recover from partial page writes
#wal_buffers = -1 # min 256kB, -1 sets based on shared_buffers
# (change requires restart)
#wal_writer_delay = 200ms # 1-10000 milliseconds
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
# - Checkpoints -
#checkpoint_segments = 32 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 15min # range 30s-1h
#checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0
#checkpoint_warning = 30s # 0 disables
# - Archiving -
#archive_mode = off # allows archiving to be done
# (change requires restart)
#archive_command = '' # command to use to archive a logfile segment
# placeholders: %p = path of file to archive
# %f = file name only
# e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
#archive_timeout = 0 # force a logfile segment switch after this
# number of seconds; 0 disables
#------------------------------------------------------------------------------
# QUERY TUNING
#------------------------------------------------------------------------------
# - Planner Method Configuration -
#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_seqscan = on
#enable_sort = on
#enable_tidscan = on
# - Planner Cost Constants -
#seq_page_cost = 1.0 # measured on an arbitrary scale
#random_page_cost = 4.0 # same scale as above
#cpu_tuple_cost = 0.01 # same scale as above
#cpu_index_tuple_cost = 0.005 # same scale as above
#cpu_operator_cost = 0.0025 # same scale as above
#effective_cache_size = 2GB
# - Genetic Query Optimizer -
#geqo = on
#geqo_threshold = 12
#geqo_effort = 5 # range 1-10
#geqo_pool_size = 0 # selects default based on effort
#geqo_generations = 0 # selects default based on effort
#geqo_selection_bias = 2.0 # range 1.5-2.0
#geqo_seed = 0.0 # range 0.0-1.0
# - Other Planner Options -
#default_statistics_target = 100 # range 1-10000
#constraint_exclusion = partition # on, off, or partition
#cursor_tuple_fraction = 0.1 # range 0.0-1.0
#from_collapse_limit = 8
#join_collapse_limit = 8 # 1 disables collapsing of explicit
# JOIN clauses
#------
1：请问为什么每天晚上12点15会出现这样的日志（别的时段我查询了没有出现）
2：请大佬给我一个配置优化方案
