今天生产中遇到了内存不足的错误：insufficient memory reserved for statement (memquota.c:228)，这里记录一下问题原因及解决办法。
解决方法：
将statement_mem默认的125MB的配置提高，建议在500MB左右或者更高一些。
操作步骤：
1.查看statement_mem默认设置：
dgadmin@flash:~$ gpconfig -s statement_mem
Values on all segments are consistent
GUC : statement_mem
Master value: 125MB
Segment value: 125MB2.在Master节点修改配置文件postgresql.conf，最后一行添加statement_mem：
chris@flash:~$ su - dgadmin
Password:
dgadmin@flash:~$ cd $MASTER_DATA_DIRECTORY
dgadmin@flash:/dgdata/master/dg-1$ ls
base gpperfmon pg_distributedlog pg_ident.conf pg_stat_tmp pg_twophase pg_xlog postmaster.opts
global pg_changetracking pg_distributedxidmap pg_log pg_subtrans pg_utilitymodedtmredo postgresql.conf postmaster.pid
gp_dbid pg_clog pg_hba.conf pg_multixact pg_tblspc PG_VERSION postgresql.conf.bak
dgadmin@flash:/dgdata/master/dg-1$dgadmin@flash:/dgdata/master/dg-1$ vim postgresql.conf
dgadmin@flash:/dgdata/master/dg-1$ gpstop -u
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Starting gpstop with args: -u
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Gathering information and validating the environment...
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Obtaining Greenplum Master catalog information
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Obtaining Segment details from master...
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Greenplum Version: 'postgres (Greenplum Database) 4.3.99.00 build Deepgreen DB'
20170611:10:40:34:003556 gpstop:flash:dgadmin-[INFO]:-Signalling all postmaster processes to reload
................dgadmin@flash:/dgdata/master/dg-1$ gpconfig -s statement_mem
Values on all segments are consistent
GUC : statement_mem
Master value: 500MB
Segment value: 500MBgp_resqueue_memory_policy = 'auto'
