Difference between revisions of "Options"

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* Values can be changed with the [[Commands#SET|SET]] command and requested with the [[Commands#GET|GET]] command. All values are ''statically bound'' to a database session; they stay valid until they are changed once again by another operation. If an option is of type boolean, and if no value is specified, its existing value will be inverted.
 
* Values can be changed with the [[Commands#SET|SET]] command and requested with the [[Commands#GET|GET]] command. All values are ''statically bound'' to a database session; they stay valid until they are changed once again by another operation. If an option is of type boolean, and if no value is specified, its existing value will be inverted.
 +
 
* Options can also be set in the prolog of XQuery expressions. In the option declaration, keys need to be prefixed with {{Code|db:}}. All values will be reset after the evaluation of a query:
 
* Options can also be set in the prolog of XQuery expressions. In the option declaration, keys need to be prefixed with {{Code|db:}}. All values will be reset after the evaluation of a query:
  
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</pre>
 
</pre>
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* {{Version|7.4}}: Options can be locally set in XQuery via pragma expressions. Note that, at least for now, local pragmas will have no effect on most [[Update|update operations]], as these will be evaluated at the very end of a query. The following query preserves whitespaces from the parsed XML string:
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<pre class="brush:xquery">
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(# db:chop false #) { parse-xml('<xml> hi </xml>') }
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</pre>
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* If options are implicitly changed by operations in the [[GUI]], the underlying commands will be listed in the [[GUI#Visualizations|Info View]].<br/>&nbsp;
 
* If options are implicitly changed by operations in the [[GUI]], the underlying commands will be listed in the [[GUI#Visualizations|Info View]].<br/>&nbsp;
  

Revision as of 00:51, 27 July 2012

This page is linked from the Getting Started Section.

The options listed on this page influence the way how database commands are executed and XQuery expressions are evaluated. Three data types exist: strings, numbers, and booleans.

  • Values can be changed with the SET command and requested with the GET command. All values are statically bound to a database session; they stay valid until they are changed once again by another operation. If an option is of type boolean, and if no value is specified, its existing value will be inverted.
  • Options can also be set in the prolog of XQuery expressions. In the option declaration, keys need to be prefixed with db:. All values will be reset after the evaluation of a query:
declare option db:key 'value';
...
  • Version 7.4: Options can be locally set in XQuery via pragma expressions. Note that, at least for now, local pragmas will have no effect on most update operations, as these will be evaluated at the very end of a query. The following query preserves whitespaces from the parsed XML string:
(# db:chop false #) { parse-xml('<xml> hi </xml>') }
  • If options are implicitly changed by operations in the GUI, the underlying commands will be listed in the Info View.
     

Main Options

The main options are only available from the Standalone Mode and Database Server instances of BaseX, i.e., they cannot be changed by database clients. They are stored in the .basex config file, which is opened by every new BaseX instance:

DBPATH

Signature DBPATH [path]
Default {home}/BaseXData or {home}/data
Summary Points to the directory in which all databases are located.
Note: this option can only be changed if no database is currently opened. If the option is changed, existing databases will not be moved to the new location.

REPOPATH

Signature REPOPATH [path]
Default {home}/BaseXRepo
Summary Points to the Repository, in which all XQuery modules are located.
Note: if the option is changed, BaseX needs to be restarted in order to activate existing packages and avoid side effects.

DEBUG

Signature DEBUG
Default false
Summary Sends internal debug info to STDERR. This option can be turned on to get additional information for development and debugging purposes.

LANG

Signature LANG [language]
Default English
Summary Specifies the interface language. Currently, seven languages are available: 'English', 'German', 'French', 'Dutch', 'Italian', 'Japanese', and 'Vietnamese'. BaseX needs to be restarted in order to activate the new language.

LANGKEY

Signature LANGKEY
Default false
Summary Prefixes all texts with the internal language keys. This option is helpful if BaseX is translated into another language, and if you want to see where particular texts are displayed. BaseX needs to be restarted in order to activate this option.

Client/Server Architecture

HOST

Signature HOST [host]
Default localhost
Summary This host name is used by the client when connecting to a server.

PORT

Signature PORT [port]
Default 1984
Summary This port is used by the client when connecting to a server.

SERVERPORT

Signature SERVERPORT [port]
Default 1984
Summary This is the port the database server will be listening to.

SERVERHOST

Signature SERVERHOST [host|ip]
Default empty (wildcard)
Summary This is the host name or ip address the server is bound to. The server will be open to all clients if the option is set to an empty string.

EVENTPORT

Signature EVENTPORT [port]
Default 1985
Summary This port is used by the client to listen for server events. This port will only be bound if a client attaches itself to a database event.

HTTPPORT

Signature HTTPPORT [port]
Default 8984
Summary This is the port the HTTP Server will be listening to.

STOPPORT

Signature STOPPORT [port]
Default 8985
Summary This is the port on which the HTTP Server can be locally closed.

HTTPPATH

Signature HTTPPATH [path]
Default {home}/BaseXHTTP
Summary Points to the HTTP root directory, in which HTML files may be stored, and query files that will be evaluated by the REST service.

PROXYHOST

Signature PROXYHOST [host]
Default
Summary This is the host name of a proxy server.

PROXYPORT

Signature PROXYPORT [port]
Default 80
Summary This is the port number of a proxy server.

NONPROXYHOSTS

Signature NONPROXYHOSTS [hosts]
Default
Summary This is a list of hosts that should be directly accessed.

PARALLEL

Signature PARALLEL [number]
Default 8
Summary Denotes the maximum allowed number of parallel read transactions.

TIMEOUT

Updated with Version 7.3: default value set from 0 to 30.

Signature TIMEOUT [seconds]
Default 30
Summary Specifies the maximum time a read-only transaction may take. If an operation takes longer than the specified timeout, it will be aborted.
Write operations will not be affected by this timeout, as this would corrupt the integrity of the database.
The timeout is deactivated if the timeout is set to 0. It is ignored for ADMIN operations.

KEEPALIVE

Updated with Version 7.3: default value set from 0 to 600.

Signature KEEPALIVE [seconds]
Default 600
Summary Specifies the maximum time a client will be remembered by the server. If there has been no interaction with a client for a longer time than specified by this timeout, it will be disconnected. Running operations will not be affected by this option. The keepalive check is deactivated if the value is set to 0.

Create Options

CHOP

Signature CHOP
Default true
Summary Chops all leading and trailing whitespaces from text nodes while building a database, and discards empty text nodes. This option often reduces the database size by up to 50%.

INTPARSE

Signature INTPARSE
Default true
Summary Uses the internal XML parser instead of the standard Java XML parser. The internal parser is faster, more fault tolerant and supports common HTML entities out-of-the-box, but it does not support all features needed for parsing DTDs.

STRIPNS

Introduced with Version 7.4:

Signature STRIPNS
Default false
Summary Strips all namespaces from an XML document before adding it to a database.

DTD

Signature DTD
Default false
Summary Parses referenced DTDs and resolves XML entities. By default, this option is switched to false, as many DTDs are located externally, which may completely block the process of creating new databases. The CATFILE option can be changed to locally resolve DTDs.

CATFILE

Signature CATFILE [path]
Default empty
Summary Specifies a catalog file to locally resolve DTDs; see the entry on Catalog Resolvers for more details.

CREATEFILTER

Signature CREATEFILTER [filter]
Default *.xml
Summary File filter in the Glob Syntax, which is applied whenever new databases are created, or resources are added to a database.

ADDARCHIVES

Signature ADDARCHIVES
Default true
Summary If this option is set to true, files within archives (ZIP, GZIP, DOCX, etc.) are parsed whenever new database are created or resources are added to a database.

SKIPCORRUPT

Signature SKIPCORRUPT
Default false
Summary Skips corrupt (i.e., not well-formed) files while creating a database or adding new documents. If this option is activated, document updates are slowed down, as all files will be parsed twice. Next, main memory consumption will be higher as parsed files will be cached in main memory.

ADDRAW

Signature ADDRAW
Default false
Summary If this option is activated, and if new resources are added to a database, all files that are not filtered by the CREATEFILTER option will be added as raw files (i.e., in their binary representation).

PARSER

Signature PARSER [type]
Default XML
Summary Defines a parser for importing new files to the database. Currently, 'XML', 'JSON', 'CSV', 'TEXT', 'HTML' are available as parsers. HTML will be parsed as normal XML files if Tagsoup is not found in the classpath.

PARSEROPT

Signature PARSEROPT [options]
Default empty
Summary Defines parser-specific options; see Parsers for more information.

HTMLOPT

Introduced with Version 7.2:

Signature HTMLOPT [options]
Default empty
Summary Allows to specify TagSoup options for HTML parsing; see HTML Parser for more information.

Database Options

MAINMEM

Signature MAINMEM
Default false
Summary If this option is turned on, new databases will be exclusively created in main memory. Most queries will be evaluated faster in main memory mode, but all data is lost if BaseX is shut down. The value of this option will be assigned once to a new database, and cannot be changed after that.

PATHINDEX

Signature PATHINDEX
Default true
Summary Creates a path index whenever a new database is created. A path index helps to optimize location paths; see Indexes for more details.

TEXTINDEX

Signature TEXTINDEX
Default true
Summary Creates a text index whenever a new database is created. A text index speeds up queries with equality comparisons on text nodes; see Indexes for more details.

ATTRINDEX

Signature ATTRINDEX
Default true
Summary Creates an attribute index whenever a new database is created. An attribute index speeds up queries with equality comparisons on attribute values; see Indexes for more details.

FTINDEX

Signature FTINDEX
Default false
Summary Creates a full-text index whenever a new database is created. A full-text index speeds up queries with full-text expressions; see Indexes for more details.

MAXLEN

Signature MAXLEN
Default 96
Summary Specifies the maximum length of strings that are to be indexed by the name, path, value, and full-text index structures. The value of this option will be assigned once to a new database, and cannot be changed after that.

MAXCATS

Signature MAXCATS
Default 100
Summary Specifies the maximum number of distinct values (categories) that will be stored together with the element/attribute names or unique paths in the Name Index or Path Index. The value of this option will be assigned once to a new database, and cannot be changed after that.

UPDINDEX

Signature UPDINDEX
Default false
Summary If turned on, incremental indexing will be activated: all update operations will also update the value index structures (texts and attribute values). The value of this option will be assigned once to a new database, and cannot be changed after that. The advantage of incremental indexes is that the value index structures will always be up-to-date. The downside is that updates will take a little bit longer.

WRITEBACK

Signature WRITEBACK
Default false
Summary Updates on XML nodes are written back to the input files. Note that no backups of your original files will be created if this option is turned on.

AUTOFLUSH

Signature AUTOFLUSH
Default true
Summary Flushes database buffers to disk after each update. If this option is set to false, bulk operations (multiple single updates) will be evaluated faster. As a drawback, the chance of data loss increases if the database is not explicitly flushed via the FLUSH command.

MAXSTAT

Signature MAXSTAT [num]
Default 30
Summary Specifies the maximum number of index occurrences printed by the INFO INDEX command.

Full-Text Options

STEMMING

Signature STEMMING
Default false
Summary A new full-text index will stem all tokens and speed up queries on stemmed tokens. The same stemming normalization will be applied to all query tokens that are checked against tokens in this index.

CASESENS

Signature CASESENS
Default false
Summary A new full-text index will preserve the case of all tokens. The same case normalization will be applied to all query tokens that are checked against tokens in this index.

DIACRITICS

Signature DIACRITICS
Default false
Summary A new full-text index will preserve the diacritics of all tokens. The same diacritics normalization will be applied to all query tokens that are checked against tokens in this index.

LANGUAGE

Signature LANGUAGE [lang]
Default en
Summary A new full-text index will use the given language to normalize all tokens. This option is mainly important if tokens are to be stemmed, or if the tokenization of a language differs from Western languages.

STOPWORDS

Signature STOPWORDS [path]
Default empty
Summary A new full-text index will drop tokens that are listed in the specified stopword list. A stopword list may decrease the size of the full text index. A standard stopword list for English texts is provided in the directory etc/stopwords.txt in the official releases.

LSERROR

Signature LSERROR [error]
Default 0
Summary This option specifies the maximum Levenshtein error for the BaseX-specific fuzzy match option. See the page on Full-Texts for more information on fuzzy querying.

WILDCARDS

Removed in Version 7.3: new index supports both fuzzy and wildcard queries.

Signature WILDCARDS
Default false
Summary If a new full-text index is created, it will be particularly optimized for wildcards expressions. See the page on Full-Texts for more information on XQuery Full Text.

SCORING

Removed in Version 7.3: new scoring model will focus on lengths of text nodes and match options.

Signature SCORING [mode]
Default 0
Summary A new full-text index will pre-calculate full-text scores. This option enables TF/IDF/based scores in full-text queries and increases main memory consumption while indexing. See the Scoring for more information on different scoring types.

Query Options

QUERYINFO

Signature QUERYINFO
Default false
Summary Prints more information on internal query rewritings, optimizations, and performance. The query info will always be printed in the Info View in the GUI, or it can be activated with the -V flag on command line.

XQUERY3

Signature XQUERY3
Default true
Summary Enables all XQuery 3.0 features supported by BaseX. If this option is set to false, the XQuery parser will only accept expressions of the XQuery 1.0 specification.

SERIALIZE

Signature SERIALIZE
Default true
Summary Results of XQuery expressions will be serialized if this option is turned on. For debugging purposes and performance measurements, this option can be set to false.

BINDINGS

Signature BINDINGS [vars]
Default empty
Summary Contains external variables to be bound to a query. Variable names and values are separated by equality signs, and multiple variables are delimited by commas. Variables may optionally be introduced with a leading dollar sign. Commas that occur in the value itself are encoded by duplication. If a variable uses a namespace different to the default namespace, it can be specified with the Clark Notation or Expanded QName Notation.
Examples $a=1,$b=2   binds the values 1 and 2 to the variables $a and $b
a=1,,2   binds the value 1,2 to the variable $a
{URI}a=x or 'URI':a=x   binds the value x to the variable $a with the namespace URI.

SERIALIZER

Signature SERIALIZER [params]
Default empty
Summary Contains parameters for serializing queries; see Serialization for more details. Keys and values are separated by equality signs, and multiple parameters are delimited by commas.
Example encoding=US-ASCII,omit-xml-declaration=no : sets the encoding to US-ASCII and prints the XML declaration.

EXPORTER

Signature EXPORTER [params]
Default empty
Summary Contains parameters for exporting all resources of a database; see Serialization for more details. Keys and values are separated by equality signs, multiple parameters are delimited by commas.

QUERYPATH

Signature QUERYPATH [path]
Default empty
Summary Contains the path (base URI) to the executed query (default: empty). This directory will be used to resolve relative paths to documents, query modules, and other resources addressed in a query.

CACHEQUERY

Signature CACHEQUERY
Default false
Summary Caches the query results before returning them to the client. This option may be set to true if the whole result is needed for further operations (such as is e.g. the case in the GUI of BaseX).

FORCECREATE

Signature FORCECREATE
Default false
Summary By activating this option, the XQuery doc() and collection() functions will create database instances for the addressed input files.

RUNS

Signature RUNS [num]
Default 1
Summary Specify number of runs a query is executed. Results are printed a single time and evaluation times are averages of all runs.

Serialization Options

XMLPLAN

Signature XMLPLAN
Default false
Summary Prints the execution plan of an XQuery expression in its XML representation.

COMPPLAN

Signature COMPPLAN
Default true
Summary Creates the query plan before or after the compilation step. Query plans might change due to optimizations.

DOTPLAN

Signature DOTPLAN
Default false
Summary Visualizes the execution plan of an XQuery expression with dotty and saves its dot file in the query directory.

DOTCOMPACT

Signature DOTCOMPACT
Default false
Summary Chooses a compact dot representation.

DOTDISPLAY

Signature DOTDISPLAY
Default true
Summary Visualizes the dot representation after the query execution.

DOTTY

Signature DOTTY [path]
Default dotty
Summary Location of the dotty executable.

Changelog

Version 7.4
Version 7.3
  • Updated: KEEPALIVE, TIMEOUT: default values changed
  • Removed: WILDCARDS; new index supports both fuzzy and wildcard queries
  • Removed: SCORING; new scoring model will focus on lengths of text nodes and match options
Version 7.2
Version 7.1
Version 7.0