postmaster內容

使用cat -n?命令可以查看postmaster.pid文件內容：

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根據每一行進行解釋，并給出對應的源代碼說明

13795: 代表Postgres主進程的PID

/usr/local/pgsql/data: 代表數據目錄

1529235109： 代表postmaster文件的創建時間。

5432: 代表數據庫監聽端口，在postgresql.conf中對應port = 5432

來自源代碼說明：

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

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/tmp: 代表是unix socket的監聽目錄，在postgresql.conf中對應?unix_socket_directory = '/tmp'

來自源代碼說明：

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

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*** **: 代表數據庫監聽地址，對應postgresql.conf的listen_addresses = '\* '

來自源代碼說明：

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

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5432001 163840:代表的是共享內存的地址(shared memory segments中的key和shmid)。

輸入ipcs可以查看：

注：?postmaster.pid顯示的是key轉成10進制后的數字。

ready?代表主進程狀態

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;

總結

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