# If you set this parameter to 1, sockets in the TIME-WAIT state over TCP connections are recycled. If the SYN waiting queue overflows, you can enable SYN cookies to defend against a small number of SYN attacks. # The maximum send socket buffer size in bytes. # The default setting (in bytes) of the socket send buffer. # The maximum receive socket buffer size in bytes # The default setting of the socket receive buffer in bytes. There are at least 2 shared memory segments within each PostgreSQL cluster. # Specify the total number of shared memory segments that can be generated. In PostgreSQL versions later than 9.2, the use of shared memory significantly drops. Recommended value: 50% of the memory capacity. # Specify the maximum size of a single shared memory segment. Recommended value: 80% of the memory capacity. # Specify the total size of shared memory segments. Each group of 16 processes requires a semaphore with a count of 17. You can run the ipcs -l or -u command to obtain the semaphore count. If a symbolic link is used, change the corresponding directory to 777. # The /data01/corefiles directory that is used to store core dumps is created with the 777 permission before testing. # Options: Set the re_pattern parameter to /data01/corefiles/core_%e_%u_%t_%s.%p. LABEL=lv01 /data01 ext4 defaults,noatime,nodiratime,nodelalloc,barrier=0,data=writeback 0 0 mkdir /data01 Mkfs.ext4 /dev/vdb1 -m 0 -O extent,uninit_bg -b 4096 -L lv01 vi /etc/fstab
Rpm -ivh parted -a optimal -s /dev/vdb mklabel gpt mkpart primary 1MiB 100%FREE
#SEMAPHOR STORAGE LIMIT INSTALL#
yum -y install coreutils glib2 lrzsz dstat sysstat e4fsprogs xfsprogs ntp readline-devel zlib-devel openssl-devel pam-devel libxml2-devel libxslt-devel python-devel tcl-devel gcc gcc-c++ make smartmontools flex bison perl-devel perl-ExtUtils* openldap-devel jadetex openjade bzip2 git iotop lvm2 perf centos-release-scl Please see Why Does PolarDB Solve the Performance Problem of FPW? for more information about machine deployment. Stay tuned for more information: Deployment Guide The original distributed version continues to evolve on the distributed branch. In the future, features (such as cross-machine parallel execution) will be introduced to enhance analysis capabilities. The industry's first open-source cloud-native database contains a large number of core self-developed technologies of Alibaba Cloud databases. You can use PFS to run PolarDB on distributed shared storage.
#SEMAPHOR STORAGE LIMIT CODE#
The code of distributed PolarDB file system (PFS) will be available soon. Currently, the open-source code can be quickly deployed on a stand-alone computer. It supports the creation of multiple instances on single storage, enabling Write Once Read Many and rapid read expansion. This architecture is similar to the Oracle RAC architecture. The PolarDB for PostgreSQL project opened the relevant source code of the core storage architecture on September 1, 2021.
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