重新启动或重新启动后，参数仍处于挂起状态

Question

在RDS，PostgreSQL 9.4中，我尝试升级参数组中的某些参数：pg_stat_statements.track，shared_preload_libraries和track_activity_query_size。如前所述，由于最后两个参数是静态的，因此我需要重新启动数据库实例。但是有线的是，即使我重新启动或重新启动实例，参数仍处于“ pending-reboot”状态

> C:\>aws rds describe-db-parameters --db-parameter-group-name
> pcore-production - source user {
>     "Parameters": [
>         {
>             "ApplyMethod": "immediate",
>             "Description": "Selects which statements are tracked by pg_stat_sta ements.",
>             "DataType": "string",
>             "IsModifiable": true,
>             "AllowedValues": "NONE,TOP,ALL",
>             "Source": "user",
>             "ParameterValue": "ALL",
>             "ParameterName": "pg_stat_statements.track",
>             "ApplyType": "dynamic"
>         },
>         {
>             "ApplyMethod": "pending-reboot",
>             "Description": "Lists shared libraries to preload into server.",
>             "DataType": "string",
>             "IsModifiable": true,
>             "AllowedValues": "pg_stat_statements",
>             "Source": "user",
>             "ParameterValue": "pg_stat_statements",
>             "ParameterName": "shared_preload_libraries",
>             "ApplyType": "static"
>         },
>         {
>             "ApplyMethod": "pending-reboot",
>             "Description": "Sets the size reserved for pg_stat_activity.current query, in bytes.",
>             "DataType": "integer",
>             "IsModifiable": true,
>             "AllowedValues": "100-102400",
>             "Source": "user",
>             "ParameterValue": "2048",
>             "ParameterName": "track_activity_query_size",
>             "ApplyType": "static"
>         }
>     ] }