Parameter Categories
Parameter Categories
Configuration parameters affect categories of server behaviors, such as resource consumption, query tuning, and authentication. The following topics describe Greenplum configuration parameter categories.
- Connection and Authentication Parameters
- System Resource Consumption Parameters
- GPORCA Parameters
- Query Tuning Parameters
- Error Reporting and Logging Parameters
- System Monitoring Parameters
- Runtime Statistics Collection Parameters
- Automatic Statistics Collection Parameters
- Client Connection Default Parameters
- Lock Management Parameters
- Resource Management Parameters (Resource Queues)
- Resource Management Parameters (Resource Groups)
- External Table Parameters
- Database Table Parameters
- Past Version Compatibility Parameters
- Greenplum Database Array Configuration Parameters
- Greenplum Mirroring Parameters for Master and Segments
- Greenplum PL/Java Parameters
Connection and Authentication Parameters
These parameters control how clients connect and authenticate to Greenplum Database.
Connection Parameters
Security and Authentication Parameters
System Resource Consumption Parameters
Memory Consumption Parameters
These parameters control system memory usage.
gp_resource_group_memory_limit (resource group-based resource management) gp_vmem_protect_limit (resource queue-based resource management) |
OS Resource Parameters
Cost-Based Vacuum Delay Parameters
You can configure the execution cost of VACUUM and ANALYZE commands to reduce the I/O impact on concurrent database activity. When the accumulated cost of I/O operations reaches the limit, the process performing the operation sleeps for a while, Then resets the counter and continues execution
Transaction ID Management Parameters
GPORCA Parameters
These parameters control the usage of GPORCA by Greenplum Database. For information about GPORCA, see About GPORCA.
Query Tuning Parameters
Postgres Planner Control Parameters
The following parameters control the types of plan operations the Postgres Planner can use. Enable or disable plan operations to force the Postgres Planner to choose a different plan. This is useful for testing and comparing query performance using different plan types.
gp_enable_agg_distinct_pruning gp_enable_groupext_distinct_gather gp_enable_groupext_distinct_pruning |
Postgres Planner Costing Parameters
Database Statistics Sampling Parameters
These parameters adjust the amount of data sampled by an ANALYZE operation. Adjusting these parameters affects statistics collection system-wide. You can configure statistics collection on particular tables and columns by using the ALTER TABLESET STATISTICS clause.
Sort Operator Configuration Parameters
Aggregate Operator Configuration Parameters
Join Operator Configuration Parameters
Other Postgres Planner Configuration Parameters
Query Plan Execution
Control the query plan execution.
Error Reporting and Logging Parameters
Log Rotation
When to Log
What to Log
System Monitoring Parameters
Greenplum Performance Database
The following parameters configure the data collection agents that populate the gpperfmon database.
Query Metrics Collection Parameters
These parameters enable and configure query metrics collection. When enabled, Greenplum Database saves metrics to shared memory during query execution. These metrics are used by Tanzu Greenplum Command Center, which is included with VMware's commercial version of Greenplum Database.
Runtime Statistics Collection Parameters
These parameters control the server statistics collection feature. When statistics collection is enabled, you can access the statistics data using the pg_stat family of system catalog views.
Automatic Statistics Collection Parameters
When automatic statistics collection is enabled, you can run ANALYZE automatically in the same transaction as an INSERT, UPDATE, DELETE, COPY or CREATE TABLE...AS SELECT statement when a certain threshold of rows is affected (on_change), or when a newly generated table has no statistics (on_no_stats). To enable this feature, set the following server configuration parameters in your Greenplum Database master postgresql.conf file and restart Greenplum Database:
gp_autostats_mode_in_functions |
Client Connection Default Parameters
Statement Behavior Parameters
Locale and Formatting Parameters
Other Client Default Parameters
Lock Management Parameters
gp_enable global_deadlock_detector |
Resource Management Parameters (Resource Queues)
The following configuration parameters configure the Greenplum Database resource management feature (resource queues), query prioritization, memory utilization and concurrency control.
gp_resqueue_priority_cpucores_per_segment gp_resqueue_priority_sweeper_interval |
max_resource_portals_per_transaction resource_cleanup_gangs_on_wait |
Resource Management Parameters (Resource Groups)
The following parameters configure the Greenplum Database resource group workload management feature.
gp_resource_group_bypass
gp_resource_group_cpu_ceiling_enforcement gp_resource_group_memory_limit |
gp_vmem_protect_segworker_cache_limit |
External Table Parameters
The following parameters configure the external tables feature of Greenplum Database.
readable_external_table_timeout |
Database Table Parameters
The following parameter configures default option settings for Greenplum Database tables.
gp_create_table_random_default_distribution gp_enable_exchange_default_partition |
Append-Optimized Table Parameters
The following parameters configure the append-optimized tables feature of Greenplum Database.
gp_add_column_inherits_table_setting |
Past Version Compatibility Parameters
The following parameters provide compatibility with older PostgreSQL and Greenplum Database versions. You do not need to change these parameters in Greenplum Database.
PostgreSQL
Greenplum Database
Greenplum Database Array Configuration Parameters
The parameters in this topic control the configuration of the Greenplum Database array and its components: segments, master, distributed transaction manager, master mirror, and interconnect.
Interconnect Configuration Parameters
gp_interconnect_snd_queue_depth |
Dispatch Configuration Parameters
Fault Operation Parameters
Distributed Transaction Management Parameters
Read-Only Parameters
Greenplum Mirroring Parameters for Master and Segments
These parameters control the configuration of the replication between Greenplum Database primary master and standby master.
Greenplum PL/Java Parameters
The parameters in this topic control the configuration of the Greenplum Database PL/Java language.