在网上搜索的命令是：
gs_guc reload -N all -I all -c "enable_wdr_snapshot=on"
执行后报错:
gs_guc: unrecognized option '--D' Try "gs_guc --help" for more information. omm@opengauss_master:~$ gs_guc reload -N all -I all -c "enable_wdr_snapshot=on" The gs_guc run with the following arguments: [gs_guc -N all -I all -c enable_wdr_snapshot=on reload ]. realpath(/usr/local/opengauss/bin/cluster_static_config) failed : No such file or directory! ERROR: Failed to get cluster information from static configuration file.
将命令改为：
gs_guc reload -D /var/lib/opengauss/data -c "enable_wdr_snapshot=on"
成功执行：
The gs_guc run with the following arguments: [gs_guc -D /var/lib/opengauss/data -c enable_wdr_snapshot=on reload ]. expected instance path: [/var/lib
/opengauss/data/postgresql.conf] gs_guc reload: enable_wdr_snapshot=on: [/var/lib/opengauss/data/postgresql.conf] server signaled
Total instances: 1. Failed instances: 0. Success to perform gs_guc!