1. 13795: 代表Postgres主进程的PID

1. /usr/local/pgsql/data: 代表数据目录

2. 1529235109： 代表postmaster文件的创建时间。

3. 5432: 代表数据库监听端口，在postgresql.conf中对应port = 5432

来自源代码说明：

/* The socket number we are listening for connections on */
int			PostPortNumber;

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1. /tmp: 代表是unix socket的监听目录，在postgresql.conf中对应 unix_socket_directory = '/tmp'

来自源代码说明：

/* The directory names for Unix socket(s) */
char	   *Unix_socket_directories;

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1. *** **: 代表数据库监听地址，对应postgresql.conf的listen_addresses = '\* '

来自源代码说明：

/* The TCP listen address(es) */
char	   *ListenAddresses;

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1. 5432001 163840:代表的是共享内存的地址(shared memory segments中的key和shmid)。

输入ipcs可以查看：

注： postmaster.pid显示的是key转成10进制后的数字。

1. ready 代表主进程状态

typedef enum
{PM_INIT,					/* postmaster starting */PM_STARTUP,					/* waiting for startup subprocess */PM_RECOVERY,				/* in archive recovery mode */PM_HOT_STANDBY,				/* in hot standby mode */PM_RUN,						/* normal "database is alive" state */PM_WAIT_BACKUP,				/* waiting for online backup mode to end */PM_WAIT_READONLY,			/* waiting for read only backends to exit */PM_WAIT_BACKENDS,			/* waiting for live backends to exit */PM_SHUTDOWN,				/* waiting for checkpointer to do shutdown* ckpt */PM_SHUTDOWN_2,				/* waiting for archiver and walsenders to* finish */PM_WAIT_DEAD_END,			/* waiting for dead_end children to exit */PM_NO_CHILDREN				/* all important children have exited */
} PMState;