postgresql FRONTEND、EXEC_BACKEND宏定义的作用 FONTEND宏主要用于标记某些可能会在libpq客户端使用的场景,虽然他们主要用于服务端。如下: /** Although this header file is nominally backend-only, certain frontend * programs like pg_controldata inc
EXEC_BACKEND */pid=fork_process();if(pid ==0)/*child*/{ IsUnderPostmaster=true;/*we are a postmaster subprocess now*//*Close the postmaster's sockets*/ClosePostmasterPorts(false);/*Lose the postmaster's on-exit routines and port connections*/on_exit_reset();/*Release postmaster's worki...
AI代码解释 intmain(int argc,char*argv[]){#ifdefEXEC_BACKENDif(argc>1&&strncmp(argv[1],"--fork",6)==0)SubPostmasterMain(argc,argv);/* does not return */#endif}voidSubPostmasterMain(int argc,char*argv[]){CreateSharedMemoryAndSemaphores();}voidCreateSharedMemoryAndSemaphores(void){XLOGShmem...
/* This points to the main array of LWLocks in shared memory. Backends inherit * the pointer by fork from the postmaster (except in the EXEC_BACKEND case, * where we have special measures to pass it down). */ LWLockPadded*MainLWLockArray=NULL; //src/backend/storage/Imgr/lwlocknames.c ...
EXEC_BACKEND */pid=fork_process();if(pid ==0)/*child*/{ IsUnderPostmaster=true;/*we are a postmaster subprocess now*//*Close the postmaster's sockets*/ClosePostmasterPorts(false);/*Lose the postmaster's on-exit routines and port connections*/on_exit_reset();/*Release postmaster's ...
#backend_hostname0 = '云数据库实例 IP 地址' #backend_port0 = 5432 #enable_pool_hba = on 您可参考以下 pgpool.conf 文件的重要参数。 注意: 如下配置为重点参数示例配置,请您根据自身业务特点进行调整,并在上线前严格测试。 云数据库 PostgreSQL 主实例已经具备 HA 切换能力,不需要 pgpool 进行切换...
指定EXEC_BACKEND,命令行指定–fork,执行SubPostmasterMain(argc. argv) 命令行指定–boot,执行AuxiliaryProcessMain(argc, argv),后台Postgres进程创建数据库集簇入口 命令行指定–describe-config,执行GucInfoMain() 命令行指定–single,执行PostgresMain(argc, argv, get_current_username(progname)),单用户环境初始化...
#ifdef EXEC_BACKENDif(argc>1&&strncmp(argv[1],"--fork",6)==0)SubPostmasterMain(argc,argv);/* does not return */#endif#ifdef WIN32/** Start our win32 signal implementation** SubPostmasterMain() will do this for itself, but the remaining modes* need it here*/pgwin32_signal_initializ...
backend startup* (since the backends inherit an already-initialized context subsystem* by virtue of being forked off the postmaster). But in an EXEC_BACKEND* build, each process must do this for itself.** In a standalone backend this must be called during backend startup.*/voidMemoryContext...
ORDER BY 1;",,,"exec_simple_query, postgres.c:1045","psql" 查看主备库同步的差异情况: select client_addr,application_name, pg_wal_lsn_diff(pg_current_wal_lsn(), flush_lsn) as diff, sync_state from pg_stat_replication; client_addr...