GBASE 8s 如何并行执行update statistics

        为了加快update statistics命令，通常需要通过并行执行提升执行效率。下面是一个 ksh/awk 脚本完成此功能。

#! /usr/bin/ksh if [[ $# -lt 2 ]]; then     echo Usage: $0 database #copies     exit 1 fi dbase=$1 ncopies=$2 if [[ $# -eq 3 ]]; then     templ=$3 else     templ='*' fi dbaccess $dbase - </dev/null output to temp$$ without headings select tabname from systables where tabid > 99   and tabname matches "$templ"; EOF awk -v ncopies=$ncopies -v dbase=$dbase ' BEGIN {     cnt=0;     pdq=100/ncopies;     printf "PDQPRIORITY=%d; export PDQPRIORITY \n", pdq; } {     if (length( $1 ) == 0){ next; } } {     # Every N copies of dostats insert a wait     if ((cnt % ncopies) == 0 && cnt > 0) { print "wait"; }     # output a dostats command for each table in the background     printf "dostats -d %s -t %s & \n", dbase, $1, pdq;     cnt++; } END {     # Now update stats on all stored procedures.     print "dostats -d %s -p \n", dbase; } ' temp$$ #####  End script  #####