InternalIpcMemoryCreate函数通过指定的key尝试创建新的共享内存段,如果内存段存在则调用失败返回NULL;如果成功,将内存段attach到当前进程,然后返回其attached地址,最后将回调函数注册到on_shmem_exit,当detach或delete该共享内存时,on_shmem_exit会调用该回调函数。 typedefkey_tIpcMemoryKey;/* shared memory key passed ...
然后根据情况ProcSignalInit为辅助进程分配ProcSignalSlot,调用InitBufferPoolBackbend方法,在其中调用on_shmem_exit注册共享内存退出清理缓存相关资源要调用的函数AtProcExit_Buffers。然后把进程设回通常模式。根据传入参数调用StartupProcessMain,设置合适的信号处理句柄,然后调用StartupXLOG方法,这个方法有约1000行,搞完退出,...
create temp table aaa (c1 int) on commit DELETE ROWS;会在提交时 删除事务内对当前temp table 的更新行,temp table本身的drop会在backend 退出时。 create temp table aaa (c1 int) on commit preserve rows会在提交时保留对 temp table 事务内的更新。 postgres=#begin;BEGINpostgres=*#createtemptableaaa(...
if(shared_memory_type==SHMEM_TYPE_MMAP){ AnonymousShmem=CreateAnonymousSegment(&size); AnonymousShmemSize=size; on_shmem_exit(AnonymousShmemDetach, (Datum)0);/* Register on-exit routine to unmap the anonymous segment */ sysvsize=sizeof(PGShmemHeader);/* Now we need only allocate a minimal-...
on_shmem_exit(WalRcvDie, 0); /* Properly accept or ignore signals the postmaster might send us */ pqsignal(SIGHUP, SignalHandlerForConfigReload); /* set flag to read config file */ pqsignal(SIGINT, SIG_IGN); pqsignal(SIGTERM, SignalHandlerForShutdownRequest); /* request shutdown */ ...
现在在$PGDATA/postgresql.conf中设置参数huge_pages为"on"并重启服务器。 $cat /proc/meminfo | grep -i hugeAnonHugePages:0 kBShmemHugePages:0 kBHugePages_Total:88HugePages_Free:81HugePages_Rsvd:64HugePages_Surp:0Hugepagesize:2048 kB
num_partitions = NUM_BUFFER_PARTITIONS; SharedBufHash = ShmemInitHash("Shared Buffer Lookup Table", size, size, &info, HASH_ELEM | HASH_BLOBS | HASH_PARTITION); } 2.2 Buffer Descriptor 这也是一个数组,在这里初始化的: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 void InitBufferPool(...
(3条消息) 【数据库】PostgreSQL编译安装详细过程_sdut菜鸟的博客-CSDN博客 PostgreSQL在Linux下的两种安装方式 - 墨天轮 (modb.pro) https://blog.csdn.net/u010856284/article/details/70142810 postgresqllinux 阅读2.4k更新于2023-06-27 引用和评论 推荐阅读 ...
4Another appiscurrently holding the yumlock; waitingforit to exit...5另一个应用程序是:PackageKit6内存:31M RSS (451MB VSZ)7已启动: Thu Aug1309:51:432020-00:11之前8状态 :睡眠中,进程ID:786079Another appiscurrently holding the yumlock; waitingforit to exit...10另一个应用程序是:PackageKit...
$ psql -h 127.0.0.1 -d postgres postgres=# CREATE DATABASE sampledb OWNER perrynzhou; CREATE DATABASE postgres=# GRANT ALL PRIVILEGES ON DATABASE sampledb to perrynzhou; GRANT postgres=# select oid, datname from pg_database ; oid | datname ---+--- 12974 | postgres 1 | template...