cache 1920 gp_max_packet_size 1920 gp_max_parallel_cursors 1920 gp_max_plan_size 1921 gp_max_slices 1921 gp_motion_cost_per_row 1921 VMware Greenplum 6 Documentation VMware by Broadcom 113 gp_ out-of-memory issues with the new gp_max_system_slices server configuration parameter. This parameter allows you to limit the maximum number of slices a query can use, preventing queries that might provoke Processing 376783 Resolves an issue where the VMware Greenplum Orca Optimizer was generating unused slices when the plan contained subplans. 377088 Resolves an issue where, in some corner cases, some qualifying

cache 1739 gp_max_packet_size 1739 gp_max_parallel_cursors 1740 gp_max_plan_size 1740 gp_max_slices 1740 max_slot_wal_keep_size 1740 gp_motion_cost_per_row 1741 gp_print_create_gang_time 1741 gp_quickz_fallback source/original table. Order-agnostic aggregates can now be designated as safe for execution on replicated slices by specifying the REPSAFE = true parameter to the CREATE AGGREGATE command. You can now use the variables is standard SQL for embedded query languages, such as ECPG. The colon syntaxes for array slices and type casts are Greenplum Database extensions, which can sometimes conflict with the standard

3.2 查询执行 QD(Query Dispatcher) 将上面的并行计划分发到每个 segment 上执行。这个例子中一共有2个 segments。 查询计划包含2个slices，所以每个 segment 会启动 2 个 QE（Query Executor），一个 QE 负责 执行一个 slice 对应的任务。 同一个 slice 在每个 segment 的 QE形成一个

cache 1885 gp_max_packet_size 1885 gp_max_parallel_cursors 1885 gp_max_plan_size 1886 gp_max_slices 1886 gp_motion_cost_per_row 1886 gp_print_create_gang_time 1886 gp_recursive_cte 1887 gp_rej issue where Greenplum Database wasted resources when it examined plan nodes that belong to other slices and initialized unnecessary structures. Greenplum now eliminates alien nodes before execution for generated poor query plans because it did not permit aggregate functions from running on replicated slices. This meant that results were always broadcasted or gathered on a single segment in order to ensure

cache 1824 gp_max_packet_size 1824 gp_max_parallel_cursors 1824 gp_max_plan_size 1825 gp_max_slices 1825 gp_motion_cost_per_row 1825 gp_print_create_gang_time 1825 gp_recursive_cte 1826 gp_rej issue where Greenplum Database wasted resources when it examined plan nodes that belong to other slices and initialized unnecessary structures. Greenplum now eliminates alien nodes before execution for generated poor query plans because it did not permit aggregate functions from running on replicated slices. This meant that results were always broadcasted or gathered on a single segment in order to ensure

1816 gp_max_local_distributed_cache 1816 gp_max_packet_size 1817 gp_max_plan_size 1817 gp_max_slices 1817 gp_motion_cost_per_row 1817 gp_recursive_cte 1818 gp_reject_percent_threshold 1818 gp_reraise_signal issue where Greenplum Database wasted resources when it examined plan nodes that belong to other slices and initialized unnecessary structures. Greenplum now eliminates alien nodes before execution for generated poor query plans because it did not permit aggregate functions from running on replicated slices. This meant that results were always broadcasted or gathered on a single segment in order to ensure

cache 1879 gp_max_packet_size 1879 gp_max_parallel_cursors 1879 gp_max_plan_size 1879 gp_max_slices 1880 gp_motion_cost_per_row 1880 gp_print_create_gang_time 1880 gp_recursive_cte 1880 gp_rej issue where Greenplum Database wasted resources when it examined plan nodes that belong to other slices and initialized unnecessary structures. Greenplum now eliminates alien nodes before execution for generated poor query plans because it did not permit aggregate functions from running on replicated slices. This meant that results were always broadcasted or gathered on a single segment in order to ensure

1590 gp_max_local_distributed_cache 1590 gp_max_packet_size 1591 gp_max_plan_size 1591 gp_max_slices 1591 gp_motion_cost_per_row 1592 gp_recursive_cte 1592 gp_reject_percent_threshold 1592 gp_reraise_signal achieve maximum parallelism during query runtime, Greenplum divides the work of the query plan into slices. A slice is a portion of the plan that segments can work on independently. A query plan is sliced operation is working on slice1 of the parallel query execution plan. A query plan is divided into slices so the segments can work on portions of the query plan in parallel. The estimated startup cost

1601 gp_max_local_distributed_cache 1601 gp_max_packet_size 1601 gp_max_plan_size 1601 gp_max_slices 1602 gp_motion_cost_per_row 1602 gp_recursive_cte 1602 gp_reject_percent_threshold 1603 gp_reraise_signal achieve maximum parallelism during query runtime, Greenplum divides the work of the query plan into slices. A slice is a portion of the plan that segments can work on independently. A query plan is sliced operation is working on slice1 of the parallel query execution plan. A query plan is divided into slices so the segments can work on portions of the query plan in parallel. The estimated startup cost

1524 gp_max_local_distributed_cache 1524 gp_max_packet_size 1525 gp_max_plan_size 1525 gp_max_slices 1525 gp_motion_cost_per_row 1526 gp_recursive_cte 1526 gp_reject_percent_threshold 1526 gp_reraise_signal achieve maximum parallelism during query runtime, Greenplum divides the work of the query plan into slices. A slice is a portion of the plan that segments can work on independently. A query plan is sliced operation is working on slice1 of the parallel query execution plan. A query plan is divided into slices so the segments can work on portions of the query plan in parallel. The estimated startup cost