Zabbix server is not running: the information displayed may not be current

[Sowmiya]

Suddenly i get this message in the zabbix webUI and I no longer receive any mail alerts.
Please help me on resolving this issue.

[storyteller]

What linux distribution do you have?
For Centos/Redhat/Fedora you can try as root user: systemctl status zabbix-server if is down try to start the service with systemctl start zabbix-server

[Sowmiya]

I have managed to resolve my issue by increasing the cache size to 1GB. After checking in ZABBIX_server.conf found this
[file:dbconfig.c,line:94] __zbx_mem_realloc(): out of memory (requested 16 bytes)
14175:20191104:033521.653 [file:dbconfig.c,line:94] __zbx_mem_realloc(): please increase CacheSize configuration parameter [file:dbconfig.c,line:94] __zbx_mem_realloc(): out of memory (requested 16 bytes)
14175:20191104:033521.653 [file:dbconfig.c,line:94] __zbx_mem_realloc(): please increase CacheSize configuration parameter