IndexOptions (Stardog-7.7.1 API)

java.lang.Object
- com.complexible.stardog.index.IndexOptions

All Implemented Interfaces:

MetaPropertyProvider
```
public final class IndexOptions
extends Object
implements MetaPropertyProvider
```
Set of options for configuring the low-level indexes.

Since:

0.6

Version:

5.0

Author:

Michael Grove, Evren Sirin, Fernando Hernandez

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`IndexOptions.CompressionType`
`static class`	`IndexOptions.IndexType` Types of indexes.
`static class`	`IndexOptions.WriteConflictStrategy`

Field Summary

Fields
Modifier and Type	Field and Description
`static boolean`	`ASYNC_FLUSH`
`static ConfigProperty<Boolean>`	`AUTO_STATS_UPDATE` Option to turn on automatic statistics updates.
`static ConfigProperty<Long>`	`BULK_LOAD_DICTIONARY_MEM` The amount of memory to be used by the bulk load dictionary.
`static Long`	`BULK_LOAD_DICTIONARY_RESERVED_MEM` THe amount of memory reserved for system operations when bulk load dictionary is being used,
`static ConfigProperty<Integer>`	`BULK_LOAD_MAX_HANDLERS`
`static ConfigProperty<Integer>`	`BULK_LOAD_MAX_PARSERS`
`static ConfigProperty<Boolean>`	`BULK_LOAD_RESIZE_HANDLERS`
`static ConfigProperty<Long>`	`BULK_LOAD_SST_CHUNK_SIZE` Option which specifies the maximum number of records will be written to index's sst file during bulk loading; After this threshold exceeds bulk load import current sst file and switches to the new one; Default value: `1_000_000_000L`
`static InfoProperty<Long>`	`BULK_LOADER_ESTIMATED_SIZE` Internal use only
`static InfoProperty<Boolean>`	`BULK_LOADER_NAMED_GRAPHS` Internal use only
`static ConfigProperty<Boolean>`	`BULK_LOADER_OVERWRITE_DATA`
`static ConfigProperty<Boolean>`	`CANONICAL_LITERALS` Specify that non-string typed literals are canonicalized in the database.
`static ConfigProperty<Integer>`	`CARDINALITY_CACHE_CAPACITY` The max capacity for the query pattern cardinality cache that is shared across queries to the same database.
`static ConfigProperty<IndexOptions.CompressionType>`	`COMPRESSION` Option which specifies what kind of compression wil lbe used for data written to disk.
`static InfoProperty<Long>`	`DEPRECATED_STATS_UPDATE_DB_MIN_SIZE` Deprecated. use `STATS_UPDATE_DB_MIN_SIZE` instead
`static ConfigProperty<Integer>`	`DIFF_INDEX_MAX_LIMIT` The limit for the size of the differential index.
`static ConfigProperty<Integer>`	`DIFF_INDEX_MIN_LIMIT` The limit for the size of the base index when differential indexes will be used.
`static InfoProperty<Integer>`	`DIFF_INDEX_SIZE` Current size of the differential index.
`static InfoProperty<com.complexible.stardog.index.IndexStrategy>`	`INDEX_STRATEGY` Intended for internal system use only, not for users.
`static ConfigProperty<IndexOptions.IndexType>`	`INDEX_TYPE` Type of the index.
`static ConfigProperty<Integer>`	`INDEX_WRITER_MERGE_LIMIT` Maximum number of triples to keep in memory for merging interleaving additions and removals while querying uncommitted state.
`static ConfigProperty<com.complexible.stardog.index.AggregateIndexes>`	`INDEXES_AGGREGATE` Option to specify whether or not to maintain aggregate indexes.
`static ConfigProperty<Boolean>`	`INLINE_BOOLEANS`
`static ConfigProperty<Integer>`	`INLINING_VERSION` Intended for internal use only, not for users.
`static ConfigProperty<Boolean>`	`IS_DICTIONARY_VACUUMING_MULTITHREADED` Option which specifies if the dictionary vacuuming process will be multithreaded; Default value: `false`
`static ConfigProperty<UUID>`	`LAST_COMMITTED_TX` Internal use only - The UUID for the last committed transaction.
`static ConfigProperty<Boolean>`	`OPTIMIZE_COMPACT`
`static ConfigProperty<Boolean>`	`OPTIMIZE_LITERAL_INDEX`
`static ConfigProperty<Boolean>`	`OPTIMIZE_STATISTICS`
`static ConfigProperty<Boolean>`	`OPTIMIZE_VACUUM_DATA`
`static ConfigProperty<Boolean>`	`OPTIMIZE_VACUUM_DICTIONARY`
`static ConfigProperty<Boolean>`	`PERSIST` Option to determine if the contents of the memory database will be persisted on disk.
`static InfoProperty<PrintStream>`	`PROGRESS_OUTPUT` Internal use only.
`static InfoProperty<Long>`	`SIZE` Current size of the database.
`static ConfigProperty<Boolean>`	`STATISTICS_CHAINS_ENABLED` Whether chain statistics is enabled or not.
`static ConfigProperty<Integer>`	`STATISTICS_CHARACTERISTIC_SETS_LIMIT` The max number of characteristic sets computed as a part of the statistical summary of the database.
`static ConfigProperty<com.complexible.stardog.index.StatisticsStrategy>`	`STATISTICS_ON_DB_CREATION` Determines how index statistics is computed when a database is bulk loaded.
`static ConfigProperty<Double>`	`STATS_UPDATE_BLOCKING_RATIO` Ratio of updated triples to the number of triples in the database that triggers the automatic statistics recomputation inside the transaction.
`static InfoProperty<Long>`	`STATS_UPDATE_COUNT` Internal use only.
`static ConfigProperty<Long>`	`STATS_UPDATE_DB_MIN_SIZE` Minimum number of triples that should be in the database for statistics to be updated automatically.
`static ConfigProperty<Double>`	`STATS_UPDATE_RATIO` Ratio of updated triples to the number of triples in the database that triggers the automatic statistics recomputation in a background thread.
`static ConfigProperty<Boolean>`	`SYNC` Deprecated. To be removed in 5.1, this option no longer has any effect on mem indexes
`static ConfigProperty<Long>`	`TX_SST_WRITE_LIMIT` Option which specifies at what point we skip memtables and use bulk loading code for transactional updates.
`static ConfigProperty<Boolean>`	`WAL_ENABLED` Option which specifies if databases uses a WAL (Write-ahead Log).
`static ConfigProperty<IndexOptions.WriteConflictStrategy>`	`WRITE_CONFLICT_STRATEGY`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static Metadata`	`disk()`
`static boolean`	`isDisk(Metadata theOptions)`
`static boolean`	`isMemory(Metadata theOptions)`
`static boolean`	`isPersist(Metadata theOptions)` Return whether or not the `PERSIST` option is set
`static Metadata`	`memory()` Options for creating a memory database.
`static Optional<PrintStream>`	`progressOutput(Metadata theOptions)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SIZE
```
public static final InfoProperty<Long> SIZE
```
    Current size of the database. Provided only for information purposes and cannot be modified by users.
  - BULK_LOAD_DICTIONARY_RESERVED_MEM
```
public static final Long BULK_LOAD_DICTIONARY_RESERVED_MEM
```
    THe amount of memory reserved for system operations when bulk load dictionary is being used,
  - BULK_LOAD_DICTIONARY_MEM
```
public static final ConfigProperty<Long> BULK_LOAD_DICTIONARY_MEM
```
    The amount of memory to be used by the bulk load dictionary. If it is set to 0 or a negative value explicitly by the user, the bulk load dictionary will not be used. If the option is not set by the user and bulk_load memory is being used this option will be automatically set based on memory configuration.
  - PERSIST
```
public static final ConfigProperty<Boolean> PERSIST
```
    Option to determine if the contents of the memory database will be persisted on disk. If memory database is persisted on disk, its contents can be reloaded at a later time when Stardog server is restarted. This option is always true for disk databases.
  - SYNC
```
@Deprecated
public static final ConfigProperty<Boolean> SYNC
```
    Deprecated. To be removed in 5.1, this option no longer has any effect on mem indexes
    
    Persistence type for a memory database, Setting this option to true indicates the db should be persisted within the commit. Otherwise, the persist will happen asynchronously after the commit is complete. This flag has no effect against disk indexes.
  - INDEX_TYPE
```
public static final ConfigProperty<IndexOptions.IndexType> INDEX_TYPE
```
    Type of the index.
  - CANONICAL_LITERALS
```
public static final ConfigProperty<Boolean> CANONICAL_LITERALS
```
    Specify that non-string typed literals are canonicalized in the database. Improves query and loading performance, but does change literal values to a canonical form. For example, "1"^^xsd:byte is canonicalized to "1"^^xsd:integer. Set this option to false if you require literals to be exactly as specified, rather than canonicalized. The default value is 'true'. note that, this value can only be set at database creation time and cannot be changed at a future time.
  - INLINE_BOOLEANS
```
public static final ConfigProperty<Boolean> INLINE_BOOLEANS
```
  - INLINING_VERSION
```
public static final ConfigProperty<Integer> INLINING_VERSION
```
    Intended for internal use only, not for users. Specifies the version of the procedure used to canonicalize literals.
  - INDEXES_AGGREGATE
```
public static final ConfigProperty<com.complexible.stardog.index.AggregateIndexes> INDEXES_AGGREGATE
```
    Option to specify whether or not to maintain aggregate indexes.
  - INDEX_STRATEGY
```
public static final InfoProperty<com.complexible.stardog.index.IndexStrategy> INDEX_STRATEGY
```
    Intended for internal system use only, not for users. Index strategy used by the database.
  - DIFF_INDEX_SIZE
```
public static final InfoProperty<Integer> DIFF_INDEX_SIZE
```
    Current size of the differential index. The differential index is used for storing additions and removals separately from the main index so updates to the database can be performed faster. The query answering will take all the data stored in the main index and the differential index so the query answers will not change. There is slight overhead for query answering with differential indexes if the differential index size gets too large. For this reason, the differential index will be merged to the main index when its size reaches the DIFF_INDEX_MAX_LIMIT. There is no benefit of differential indexes if the main index itself is too small. For this reason, the differential index is not used until the main index size reaches DIFF_INDEX_MAX_LIMIT.
  - DIFF_INDEX_MIN_LIMIT
```
public static final ConfigProperty<Integer> DIFF_INDEX_MIN_LIMIT
```
    The limit for the size of the base index when differential indexes will be used. If the main index size is below this limit, all the changes will be applied to the main index.
    
    See Also:
    
    DIFF_INDEX_SIZE
  - DIFF_INDEX_MAX_LIMIT
```
public static final ConfigProperty<Integer> DIFF_INDEX_MAX_LIMIT
```
    The limit for the size of the differential index. If the differential index size exceeds this limit, it will automatically be merged to the main index.
    
    See Also:
    
    DIFF_INDEX_SIZE
  - PROGRESS_OUTPUT
```
public static final InfoProperty<PrintStream> PROGRESS_OUTPUT
```
    Internal use only. Use DatabaseOptions.PROGRESS_MONITOR_ENABLED instead.
  - BULK_LOADER_NAMED_GRAPHS
```
public static final InfoProperty<Boolean> BULK_LOADER_NAMED_GRAPHS
```
    Internal use only
  - BULK_LOADER_ESTIMATED_SIZE
```
public static final InfoProperty<Long> BULK_LOADER_ESTIMATED_SIZE
```
    Internal use only
  - BULK_LOAD_MAX_PARSERS
```
public static final ConfigProperty<Integer> BULK_LOAD_MAX_PARSERS
```
  - BULK_LOAD_MAX_HANDLERS
```
public static final ConfigProperty<Integer> BULK_LOAD_MAX_HANDLERS
```
  - BULK_LOAD_RESIZE_HANDLERS
```
public static final ConfigProperty<Boolean> BULK_LOAD_RESIZE_HANDLERS
```
  - BULK_LOADER_OVERWRITE_DATA
```
public static final ConfigProperty<Boolean> BULK_LOADER_OVERWRITE_DATA
```
  - STATS_UPDATE_COUNT
```
public static final InfoProperty<Long> STATS_UPDATE_COUNT
```
    Internal use only.
  - STATS_UPDATE_DB_MIN_SIZE
```
public static final ConfigProperty<Long> STATS_UPDATE_DB_MIN_SIZE
```
    Minimum number of triples that should be in the database for statistics to be updated automatically.
  - DEPRECATED_STATS_UPDATE_DB_MIN_SIZE
```
@Deprecated
public static final InfoProperty<Long> DEPRECATED_STATS_UPDATE_DB_MIN_SIZE
```
    Deprecated. use STATS_UPDATE_DB_MIN_SIZE instead
    
    This is the deprecated option replaced with STATS_UPDATE_DB_MIN_SIZE. The declaration exists only to avoid unnecessarry warnings for databases created before version 5.2.3.
  - STATISTICS_ON_DB_CREATION
```
public static final ConfigProperty<com.complexible.stardog.index.StatisticsStrategy> STATISTICS_ON_DB_CREATION
```
    Determines how index statistics is computed when a database is bulk loaded. By default it's computed synchronously.
  - AUTO_STATS_UPDATE
```
public static final ConfigProperty<Boolean> AUTO_STATS_UPDATE
```
    Option to turn on automatic statistics updates. When this option is set to true, Stardog will decide when to update statistics as the database is modified through additions and removals and update statistics as needed. If this option is set to false, Stardog will never update the statistics regardless of how much the database is updated.
  - COMPRESSION
```
public static final ConfigProperty<IndexOptions.CompressionType> COMPRESSION
```
    Option which specifies what kind of compression wil lbe used for data written to disk. Default value: LZ4
  - WRITE_CONFLICT_STRATEGY
```
public static final ConfigProperty<IndexOptions.WriteConflictStrategy> WRITE_CONFLICT_STRATEGY
```
  - WAL_ENABLED
```
public static final ConfigProperty<Boolean> WAL_ENABLED
```
    Option which specifies if databases uses a WAL (Write-ahead Log). WAL ensures committed transactions will not be lost if the server crashes without a proper shutdown. Default value: true
  - BULK_LOAD_SST_CHUNK_SIZE
```
public static final ConfigProperty<Long> BULK_LOAD_SST_CHUNK_SIZE
```
    Option which specifies the maximum number of records will be written to index's sst file during bulk loading; After this threshold exceeds bulk load import current sst file and switches to the new one; Default value: 1_000_000_000L
  - TX_SST_WRITE_LIMIT
```
public static final ConfigProperty<Long> TX_SST_WRITE_LIMIT
```
    Option which specifies at what point we skip memtables and use bulk loading code for transactional updates. Default value: 4_000_000L
  - IS_DICTIONARY_VACUUMING_MULTITHREADED
```
public static final ConfigProperty<Boolean> IS_DICTIONARY_VACUUMING_MULTITHREADED
```
    Option which specifies if the dictionary vacuuming process will be multithreaded; Default value: false
  - STATS_UPDATE_RATIO
```
public static final ConfigProperty<Double> STATS_UPDATE_RATIO
```
    Ratio of updated triples to the number of triples in the database that triggers the automatic statistics recomputation in a background thread. This option has no effect if AUTO_STATS_UPDATE is off or the index size is less than STATS_UPDATE_DB_MIN_SIZE. If the ratio is set to to 0.1 then adding 100K triples to a database with 1M triples will trigger the automatic stats recomputation. The added and removed triples are counted separately so adding 50K triples removing 50K triples count as updating 100K triples. Default value: 0.1
  - STATS_UPDATE_BLOCKING_RATIO
```
public static final ConfigProperty<Double> STATS_UPDATE_BLOCKING_RATIO
```
    Ratio of updated triples to the number of triples in the database that triggers the automatic statistics recomputation inside the transaction. This option is similar to STATS_UPDATE_RATIO but it is performed synchronously within the transaction instead of a background thread. The client will not get the commit acknowledgement until the stats is recomputed. This option has no effect if AUTO_STATS_UPDATE is off or the index size is less than STATS_UPDATE_DB_MIN_SIZE. Setting this option to a non-positive number (<= 0) will disable blocking updates. Default value: 0
  - CARDINALITY_CACHE_CAPACITY
```
public static final ConfigProperty<Integer> CARDINALITY_CACHE_CAPACITY
```
    The max capacity for the query pattern cardinality cache that is shared across queries to the same database. Default value: 1024
  - STATISTICS_CHARACTERISTIC_SETS_LIMIT
```
public static final ConfigProperty<Integer> STATISTICS_CHARACTERISTIC_SETS_LIMIT
```
    The max number of characteristic sets computed as a part of the statistical summary of the database. More diverse datasets may require a higher number for more accurate query planning. The downside is higher memory footprint and slower planning. This is a soft limit and the actual number of sets can slightly exceed it. Default value: 10000
  - STATISTICS_CHAINS_ENABLED
```
public static final ConfigProperty<Boolean> STATISTICS_CHAINS_ENABLED
```
    Whether chain statistics is enabled or not. Default value: true
  - INDEX_WRITER_MERGE_LIMIT
```
public static final ConfigProperty<Integer> INDEX_WRITER_MERGE_LIMIT
```
    Maximum number of triples to keep in memory for merging interleaving additions and removals while querying uncommitted state.
  - LAST_COMMITTED_TX
```
public static final ConfigProperty<UUID> LAST_COMMITTED_TX
```
    Internal use only - The UUID for the last committed transaction.
  - OPTIMIZE_VACUUM_DATA
```
public static final ConfigProperty<Boolean> OPTIMIZE_VACUUM_DATA
```
  - OPTIMIZE_VACUUM_DICTIONARY
```
public static final ConfigProperty<Boolean> OPTIMIZE_VACUUM_DICTIONARY
```
  - OPTIMIZE_STATISTICS
```
public static final ConfigProperty<Boolean> OPTIMIZE_STATISTICS
```
  - OPTIMIZE_COMPACT
```
public static final ConfigProperty<Boolean> OPTIMIZE_COMPACT
```
  - OPTIMIZE_LITERAL_INDEX
```
public static final ConfigProperty<Boolean> OPTIMIZE_LITERAL_INDEX
```
  - ASYNC_FLUSH
```
public static final boolean ASYNC_FLUSH
```
- Method Detail
  - isMemory
```
public static boolean isMemory(Metadata theOptions)
```
  - isDisk
```
public static boolean isDisk(Metadata theOptions)
```
  - memory
```
public static Metadata memory()
```
    Options for creating a memory database. Memory databases are only to be used for testing and prototyping. They're not intended for production use.
    
    Returns:
    
    default options for a memory database
  - disk
```
public static Metadata disk()
```
  - isPersist
```
public static boolean isPersist(Metadata theOptions)
```
    Return whether or not the PERSIST option is set
    
    Parameters:
    
    theOptions - the options
    
    Returns:
    
    true if the persist option is set, false otherwise
  - progressOutput
```
public static Optional<PrintStream> progressOutput(Metadata theOptions)
```

Class IndexOptions

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SIZE

BULK_LOAD_DICTIONARY_RESERVED_MEM

BULK_LOAD_DICTIONARY_MEM

PERSIST

SYNC

INDEX_TYPE

CANONICAL_LITERALS

INLINE_BOOLEANS

INLINING_VERSION

INDEXES_AGGREGATE

INDEX_STRATEGY

DIFF_INDEX_SIZE

DIFF_INDEX_MIN_LIMIT

DIFF_INDEX_MAX_LIMIT

PROGRESS_OUTPUT

BULK_LOADER_NAMED_GRAPHS

BULK_LOADER_ESTIMATED_SIZE

BULK_LOAD_MAX_PARSERS

BULK_LOAD_MAX_HANDLERS

BULK_LOAD_RESIZE_HANDLERS

BULK_LOADER_OVERWRITE_DATA

STATS_UPDATE_COUNT

STATS_UPDATE_DB_MIN_SIZE

DEPRECATED_STATS_UPDATE_DB_MIN_SIZE

STATISTICS_ON_DB_CREATION

AUTO_STATS_UPDATE

COMPRESSION

WRITE_CONFLICT_STRATEGY

WAL_ENABLED

BULK_LOAD_SST_CHUNK_SIZE

TX_SST_WRITE_LIMIT

IS_DICTIONARY_VACUUMING_MULTITHREADED

STATS_UPDATE_RATIO

STATS_UPDATE_BLOCKING_RATIO

CARDINALITY_CACHE_CAPACITY

STATISTICS_CHARACTERISTIC_SETS_LIMIT

STATISTICS_CHAINS_ENABLED

INDEX_WRITER_MERGE_LIMIT

LAST_COMMITTED_TX

OPTIMIZE_VACUUM_DATA

OPTIMIZE_VACUUM_DICTIONARY

OPTIMIZE_STATISTICS

OPTIMIZE_COMPACT

OPTIMIZE_LITERAL_INDEX

ASYNC_FLUSH

Method Detail

isMemory

isDisk

memory

disk

isPersist

progressOutput