System Settings Reference
This section provides reference information for each of the AnzoGraph Basic system configuration settings. For instructions on changing settings, see Changing System Settings.
AnzoGraph provides other Advanced configuration settings that are intended only for system administrators or users with an advanced level of knowledge about AnzoGraph or databases in general. See the configuration file, <install_path>/config/settings.conf, for descriptions of the Advanced settings.
| Setting | Description | Default Value (Type) |
|---|---|---|
| enable_persistence | Controls AnzoGraph's save data to disk option. By default, persistence is enabled and the data in memory is saved to disk (in the persistence_directory) after every transaction. Each time the database is restarted, the persisted data is automatically loaded back into memory. When persistence is disabled, data must be reloaded back into memory when the database is restarted. | true (boolean) |
| enable_sparql_protocol | Specifies whether to enable the SPARQL HTTP protocol service. The sparql_protocol_port setting controls the port to use if this option is set to true. | true (boolean) |
| enable_ssl_protocol | Specifies whether to enable the secure SPARQL HTTPS service for SSL connections. The ssl_protocol_port setting controls the port to use. | true (boolean) |
| internal_directory | The directory where AnzoGraph should save internal database's operational cache files. For more information, see Relocating AnzoGraph Directories. | Not set (char) The default directory for internal operational data is <install_path>/internal. |
| max_memory | Specifies the amount of memory (in MB) that is available for AnzoGraph. The default is system-based; at startup, AnzoGraph determines the amount of RAM that is available and sets max_memory. In test environments where AnzoGraph may be co-located with other programs, you can set the max_memory value to put a limit on the amount of memory AnzoGraph can use. However, Cambridge Semantics recommends that you do not set max_memory unless instructed by Support. | System-based (int) |
| output_format | Specifies the default output format for AnzoGraph responses. Valid values are xml, json, or csv. | xml (char) |
| persistence_directory | The directory where AnzoGraph should save data when it is persisted to disk. For more information, see Relocating AnzoGraph Directories. | Not set (char) The default directory for persisted data is <install_path>/persistence |
| sparql_protocol_port | Specifies the SPARQL service HTTP port to use if enable_sparql_protocol is set to true. | 7070 (int) |
| sparql_spec_default_graph | Controls the default scope of SPARQL queries when FROM clauses are excluded from a query. When false, queries without FROM clauses target the default graph (DEFAULTSET) only. Triples in named graphs will not be included in the scope of the query. When true, queries without FROM clauses target all graphs in the database. Triples in the default graph and any named graph are included in the scope of the query. For more information, see Changing the Default FROM Clause Behavior. | false (boolean) |
| spill_directory | The directory where AnzoGraph should save temporary query files that spill to disk. For more information, see Relocating AnzoGraph Directories. AnzoGraph uses O_DIRECT to read spill files into the database. If you relocate the spill directory, place it on an ext4 file system that supports O_DIRECT. |
Not set (char) The default directory for spill files is <install_path>/spill |
| ssl_protocol_port | Specifies SPARQL service HTTPS port to use if enable_ssl_protocol is set to true. | 8256 (int) |
| startup_info | Specifies how verbose the startup message is: - 0-quiet, 1-ready, 2-ports, 3-more. | 1 (int) |
| stop_timeout | The number of seconds to wait for queries to finish before stopping the database with a -stop request. | 30 (int) |
| truncate_clob | Specifies whether to truncate large strings to the maximum string size (1 MB). | false (boolean) |
| use_custom_ssl_files | Specifies whether to use custom SSL files containing fully qualified domain names. | false (boolean) |
| user_queues | Sets the limit on the number of queries that can run concurrently. | 40 (int) |
| enable_unbound_variables | Controls whether AnzoGraph returns an empty result or an error if a query references a missing graph or includes unbound variables. This value is set to false by default, which means AnzoGraph returns an error. For more information, see Ignoring Missing Graphs. | false (boolean) |
| auto_restart_directory | Specifies the base location of the auto_restart directory, which contains the denied_list, warned_list, and unanalyzed_list directories. For more information about the auto-restart feature, see Managing Automatic Database Restart Options. | Not set (char) The default location for the auto_restart directory is <install_path>/internal. |
| auto_restart_max_attempts | Specifies the number of times the system manager should attempt to start the database after a crash. The default value is 5, which means the system manager will attempt to restart the database a maximum of 5 times. Changing auto_restart_max_attempts to 0 disables the auto-restart feature. For more information about the auto-restart feature, see Managing Automatic Database Restart Options. | 5 (int) |
| auto_restart_time | Specifies the number of seconds to spend attempting to restart the database. If all attempts fail and this time limit is reached, the system manager stops trying to restart the database. The default value is 600, which means that the system manager will attempt to restart the database for a maximum of 600 seconds (10 minutes). For more information about the auto-restart feature, see Managing Automatic Database Restart Options. | 600 (int) |
| ignore_deniedlist_queries | Controls whether denied list queries are blocked from running or are allowed to be run when the database is returned to normal operation. The default value is true, which means denied list queries are ignored. Incoming queries are not compared with the denied list and are permitted to run. If ignore_deniedlist_queries is false, denied list queries are not ignored and are therefore blocked from running until they are removed from the denied list. For more information about the auto-restart feature, see Managing Automatic Database Restart Options. | true (boolean) |
| jvm_max_memory | Specifies the maximum size of the heap that can be used by the embedded Java virtual machine (JVM). Use k, m, or g (case insensitive) for KiB, MiB, or GiB. You can also specify % to indicate a percentage of the total memory that is available to AnzoGraph. By default, this value is not set, which means jvm_max_memory defaults to either 5% of the total memory or 4g, whichever value is smaller. | Not set (char) When not set, the default is 5% or 4g, depending on which value is smaller. |
| jvm_options | Lists any optional parameters to use for configuring the embedded JVM. Use a semicolon-delimited (;) list to specify multiple parameters. For information about JVM options, see Options in the Java Documentation. | Not set (char) |
| paged_data | Enables or disables AnzoGraph's paged data feature, which controls whether data is stored in memory or on disk. When this option is false (the default value), data is stored in memory. Setting this option to true changes data storage from in-memory to on-disk (in the persistence_directory). Enabling this option changes the underlying database operations. Before enabling paged data, make sure that the performance and storage impacts are well-understood and that your environment meets the requirements. See Sizing Guidelines for Disk-Based Storage (Preview) for details. |
false (boolean) |
| paged_cache_memory_percent | When paged_data is enabled, this setting controls the amount of memory (as a percentage of total memory) to use for caching the most recently requested data. The default value is 20, which means AnzoGraph is configured to use 20% of the total available memory for caching data for analytics. For example, if you have 1 TB of data on disk and 300 GB of available RAM, AnzoGraph caches in memory 60 GB of the most recently accessed data. If a query requests data that is not currently cached, AnzoGraph releases the least accessed data from memory and loads the relevant data into memory. Note that a portion of the paged cache memory percent is used for the overhead of tracking the pages that are accessed. For more information, see Enabling Paged Data Mode (Preview). Cambridge Semantics recommends that you do not set this value higher than 30. |
20 (int) |