Options

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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. Two kinds of options exist:

  • Global Options are valid for all BaseX instances in the same JVM. This is particularly relevant if you are working with the client/server architecture.
  • Local options (all remaining ones) are specific to a client or session.

Values of options are either strings, numbers or booleans. Options are static and not bound to a single operation (for example, the next command). Various ways exist to access and change options:

  • The current value of an option can be requested with the SHOW OPTIONS command. Local options can be changed via SET (all global options, except for DEBUG, can only be changed at startup time). If an option is of type boolean, and if no value is specified, its current value is inverted.
  • The .basex configuration file is parsed by every new local BaseX instance. It contains all global options. Local options can be specified at the end of the file after the Local Options comment:
# General Options
DEBUG = false
...

# Local Options
CATALOG = etc/w3-catalog.xml
  • Initial values for global options can also be specified via system properties, which can be passed on with the -D flag on the command line, or with System.setProperty() before creating a BaseX instance. The specified keys need to be prefixed with org.basex.. An example:
java -Dorg.basex.CATALOG=etc/w3-catalog.xml -cp basex.jar org.basex.BaseX -c"SHOW OPTIONS catalog"
CATALOG: etc/w3-catalog.xml
  • If the Mac OS X packaged application is used, global options can be set within the Info.plist file within the Contents folder of the application package. For example:
<key>JVMOptions</key>
<array>
  <string>-Dorg.basex.CATALOG=etc/w3-catalog.xml</string>
</array>
  • In a Web Application, the default can be adjusted in the web.xml file as follows:
<context-param>
  <param-name>org.basex.catalog</param-name>
  <param-value>etc/w3-catalog.xml</param-value>
</context-param>
  • In XQuery, local options can be set via option declarations and pragmas.

If options are changed by operations in the GUI, the underlying commands are output in the Info View.

Contents

Global Options

Global options are constants. They can only be set in the configuration file or via system properties (see above). One exception is the DEBUG option, which can also be changed at runtime by users with admin permissions.

General Options

DEBUG

Signature DEBUG [boolean]
Default false
Summary Sends debug information to STDERR. This option can be enabled to get additional information for development and debugging purposes. It can also be triggered on the command line via -d. Note that the amount of output can be overwhelming, so it should not be used productively.

DBPATH

Signature DBPATH [path]
Default {home}/data
Summary Points to the directory in which all databases are located.

LOGPATH

Signature LOGPATH [path]
Default .logs
Summary Points to the directory where log files are stored. Relative paths are resolved against the DBPATH directory.

REPOPATH

Signature REPOPATH [path]
Default {home}/repo
Summary Points to the Repository, in which all XQuery modules are located.

LANG

Signature LANG [language]
Default English
Summary Specifies the interface language.

FAIRLOCK

Signature FAIRLOCK [boolean]
Default false
Summary Defines the locking strategy:
  • By default, non-fair locking is used. Read transactions are favored, and transactions that no not access databases can be evaluated even if the limit for parallel transactions (specified via PARALLEL) is reached. This prevents update operations from blocking all other requests. For example, the DBA can still be used to see which jobs are running even if the queue is full.
  • When fair locking is enabled, read and write transactions are treated equally (first in, first out). This avoids starvation of updates and should be used when prompt evaluation of updates is critical.

CACHETIMEOUT

Signature CACHETIMEOUT [seconds]
Default 3600
Summary Specifies how many seconds the results of asynchronously executed jobs are cached in main memory.

Client/Server Architecture

HOST

Signature HOST [host]
Default localhost
Summary This host name is used by the client when connecting to a server. This option can also be changed when running the client on command line via -n.

PORT

Signature PORT [port]
Default 1984
Summary This port is used by the client when connecting to a server. This option can also be changed when running the client on command line via -p.

SERVERPORT

Signature SERVERPORT [port]
Default 1984
Summary This is the port the database server is listening to. This option can also be changed when running the server on command line via -p.

USER

Signature USER [name]
Default empty
Summary Represents a username, which is used for accessing the server or an HTTP service:
  • The default value is overwritten if a client specifies its own credentials.
  • If the default value is empty, login will only be possible if the client specifies credentials.
  • The option can also be changed on command line via -U.

PASSWORD

Signature PASSWORD [password]
Default empty
Summary Represents a password, which is used for accessing the server:
  • The default value is overwritten if a client specifies its own credentials.
  • If the default value is empty, authentication will only be possible if the client supplies credentials.
  • The option can also be changed on command line via -P.
  • Please note that it is a security risk to specify your password in plain text.

AUTHMETHOD

Signature AUTHMETHOD [method]
Default Basic
Summary Specifies the default authentication method used by the HTTP server for negotiating credentials. Allowed values are Basic, Digest, and Custom:
  • If basic access is chosen, the client can still request digest authentication.
  • This is different for digest access, which cannot be overwritten.
  • With custom authentication, the server will not do any authentication.

SERVERHOST

Signature SERVERHOST [host|ip]
Default empty
Summary This is the host name or IP address the server is bound to. If the option is set to an empty string (which is the default), the server accepts requests from all clients.

PROXYHOST

Signature PROXYHOST [host]
Default empty
Summary This is the host name of a proxy server. If the value is an empty string, it is ignored.

PROXYPORT

Signature PROXYPORT [port]
Default 0
Summary This is the port number of a proxy server. If the value is set to 0, it is ignored.

NONPROXYHOSTS

Signature NONPROXYHOSTS [hosts]
Default empty
Summary This is a list of hosts that should be directly accessed. If the value is an empty string, it is ignored.

IGNORECERT

Signature IGNORECERT [boolean]
Default false
Summary Disable SSL hostname verification and ignore untrusted certificates when connecting to servers.

TIMEOUT

Signature TIMEOUT [seconds]
Default 30
Summary Specifies the maximum time a transaction triggered by a client may take. An operation is interrupted when it takes longer than the specified number of seconds. Running update operations are not affected by this timeout, as this would corrupt the integrity of the database. The timeout is disabled if the timeout is set to 0. It is ignored for operations with admin permissions.

KEEPALIVE

Signature KEEPALIVE [seconds]
Default 600
Summary Specifies the maximum time a client is 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 check is disabled if the value is set to 0.

PARALLEL

Signature PARALLEL [number]
Default 8
Summary Denotes the maximum allowed number of parallel transactions:
  • If FAIRLOCK is enabled, the number of parallel transactions will never exceed the specified value.
  • If the option is disabled (which is the default), the limit only applies to transactions that access databases.
  • The main reason for allowing parallel operations is to prevent slow transactions from blocking all other operations. A higher number of parallel operations may increase disk activity and thus slow down queries. In some cases, a single transaction may even give you better results than any parallel activity.

LOG

Signature LOG [boolean]
Default true
Summary Turns Logging of server operations and HTTP requests on/off. This option can also be changed when running the server on command line via -z.

LOGMSGMAXLEN

Signature LOGMSGMAXLEN [length]
Default 1000
Summary Specifies the maximum length of a single log message.

LOGTRACE

Signature LOGTRACE [boolean]
Default true
Summary If BaseX is running as a Web Application, trace output (generated via fn:trace, prof:dump and similar functions) is written to the database logs. When this option is disabled, trace output is redirected to standard error, as it is known from the standalone version of BaseX.

HTTP Services

Most HTTP options are defined in the jetty.xml and web.xml configuration files in the webapp/WEB-INF directory. Some additional BaseX-specific options exist that are set before the web server is started:

WEBPATH

Signature WEBPATH [path]
Default {home}/webapp
Summary Points to the directory in which all the Web Application contents are stored, including XQuery, Script, RESTXQ and configuration files:
  • The option is ignored if BaseX is deployed as web servlet.
  • It cannot be assigned via the web.xml file, as it is evaluated before the configuration files are parsed.

GZIP

Signature GZIP [boolean]
Default false
Summary Jetty provides a Gzip handler for dynamically uncompressing requests and compressing responses. This feature can be enabled if Jetty is started via the BaseX HTTP Server:
  • The option can also be enabled on command line via -g.
  • It cannot be assigned via the web.xml file, as the option is evaluated before the configuration files are parsed.
  • In addition to the Jetty defaults (GET requests, exclusion of binaries, MSIE 6.0, etc.), POST and PUT requests are supported.

RESTXQPATH

Signature RESTXQPATH [path]
Default empty
Summary Points to the directory which contains the RESTXQ modules of a web application. Relative paths are resolved against the WEBPATH directory.

PARSERESTXQ

Signature PARSERESTXQ
Default 3
Summary Timeout after which the RESTXQ directory is parsed for changes:
  • If 0 is specified, the directory is parsed every time a RESTXQ function is called.
  • A positive value defines the idle time, in seconds, after which parsing is enforced. The default value is 3: Changes in the RESTXQ directory is detected after 3 seconds without RESTXQ function calls.
  • Monitoring is completely disabled if a negative value is specified.

See RESTXQ Preliminaries for more details.

RESTXQERRORS

Signature RESTXQERRORS
Default true
Summary Reports parsing errors in XQuery modules in the RESTXQ directory and returns the full error message and stack trace to the client. By default, this option is enabled. In a production environment, it can be disabled to suppress errors that should not be seen by the user of an API (the full error information can still be looked up in the database logs). See RESTXQ Error Handling for more details.

RESTPATH

Signature RESTPATH [path]
Default empty
Summary Points to the directory which contains XQuery files and command scripts, which can be evaluated via the REST run operation. Relative paths are resolved against the WEBPATH directory.

HTTPLOCAL

Signature HTTPLOCAL [boolean]
Default false
Summary By default, if BaseX is run as Web Application, the database server instance is started in addition, which can then be addressed by Clients via the database port (see PORT). If the option is set to true, no database server is launched.

STOPPORT

Signature STOPPORT [port]
Default 8081
Summary If Jetty is started from BaseX, this is the port on which the HTTP Server can be closed:
  • The listener for stopping the web server will only be started if the specified value is greater than 0.
  • The option is ignored if BaseX is used as a Web Application or started via Maven.
  • This option can also be changed when running the HTTP server on command line via -s.

Create Options

General

MAINMEM

Signature MAINMEM [boolean]
Default false
Summary If this option is turned on, new databases arecreated in main memory:
  • Most queries are evaluated faster in main-memory mode, but all data is lost if the BaseX instance in which the database was created is shut down.
  • It is not possible to store binary resources in a main-memory database.
  • A main-memory database will have no disk representation. However, it is possible to export the database via the EXPORT command, and create a new database from the exported file in a second step.
  • This option will not be available for db:create because the database would not be accessible anymore after database creation, i.e., outside the query scope.

ADDCACHE

Signature ADDCACHE [boolean]
Default false
Summary If this option is activated, data structures of documents will first be cached to disk before being added to the final database. This option is helpful when larger documents need to be added, and if the existing heuristics cannot estimate the input size (e.g. when adding directories or sending input streams).

Parsing

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 [boolean]
Default true
Summary If this option is set to true, files within archives (ZIP, GZIP, TAR, TGZ, DOCX, etc.) are parsed whenever new databases are created or resources are added to a database.

ARCHIVENAME

Signature ARCHIVENAME [boolean]
Default false
Summary If this option is set to true, the file name of parsed archives is included in the document paths.

SKIPCORRUPT

Signature SKIPCORRUPT [boolean]
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 are parsed twice. Next, main-memory consumption is higher, as parsed files are cached in main memory.

ADDRAW

Signature ADDRAW [boolean]
Default false
Summary If this option is enabled, all resources that are filtered out by the CREATEFILTER option while being added to a database are stored as raw files instead (i.e., in their binary representation).

PARSER

Signature PARSER [type]
Default XML
Summary Defines a parser for importing new files to the database. Available parsers are XML, JSON, CSV, TEXT, HTML, and RAW. HTML input is parsed as XML if Tagsoup is not found in the class path.

CSVPARSER

Signature CSVPARSER [options]
Default empty
Summary Specifies the way how CSV data is parsed. Keys and values are delimited with =, and multiple options are delimited with ,. The available options (except for the additional encoding option) are described in the CSV Module.
Examples encoding=CP1252,header=true parses the input as CP1252 and the first line as header.

JSONPARSER

Signature JSONPARSER [options]
Default empty
Summary Specifies the way how JSON data is parsed. Keys and values are delimited with =, and multiple options are delimited with ,. The available options (except for the additional encoding option) are described in the JSON Module.
Examples format=jsonml,lax=yes interprets the input as JSONML and uses lax parsing.

HTMLPARSER

Signature HTMLPARSER [options]
Default empty
Summary Specifies the way how HTML data is parsed. Keys and values are delimited with =, and multiple options are delimited with ,. The available options are described in the Parsers article.
Examples
  • encoding=Shift-JIS,nons=true parses the input as Shift-JIS and suppresses namespaces.
  • lexical=true preserves comments.

XML Parsing

STRIPWS

Signature STRIPWS [boolean]
Default false
Summary Many XML documents include whitespaces that have been added to improve readability. This option controls the white-space processing mode of the XML parser:
  • If the option is set to true, leading and trailing whitespaces from text nodes are stripped and empty text nodes are discarded.
  • The flag should be disabled if a document contains mixed content.
  • The flag can also be turned on via the command line and -w.
  • If the option is enabled, whitespaces of an element and its descendants can locally be preserved with the xml:space="preserve" attribute:
<xml>
  <title>
    Demonstrating the STRIPWS flag
  </title>
  <text xml:space="preserve">To <b>be</b>, or not to <b>be</b>, that is the question.</text>
</xml>

If whitespaces are stripped, indent=yes can be assigned to the SERIALIZER option to get properly indented XML output.
See BaseX 10: Whitespaces for more information on whitespace handling.

STRIPNS

Signature STRIPNS [boolean]
Default false
Summary Strips all namespaces from an XML document while parsing.

INTPARSE

Signature INTPARSE [boolean]
Default false
Summary Uses the internal XML parser instead of the standard Java XML parser. Reasons for using the internal parser are:
  • Performance: Documents, in particular small ones, are parsed faster.
  • Entity support: More than 2000 HTML character references are decoded.
  • Fault tolerance: Invalid characters are replaced with the Unicode replacement character FFFD (�).

By default, Java’s Xerces parser is used as it supports all features of the XML standard, including XINCLUDE, or recursive entity expansion if specified in DTDs.

DTD

Signature DTD [boolean]
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 CATALOG option can be changed to locally resolve DTDs.

XINCLUDE

Signature XINCLUDE [boolean]
Default true
Summary Resolves XInclude inclusion tags and merges referenced XML documents. By default, this option is switched to true. This option is only available if the standard Java XML Parser is used (see INTPARSE).

CATALOG

Signature CATALOG [path]
Default empty
Summary Semicolon-separated list of XML catalog files to resolve URIs. See Catalog Resolvers for more details.

Indexing

The following options control the creation of index structures. The current values are considered if a new database is created. See Indexes for more details.

TEXTINDEX

Signature TEXTINDEX [boolean]
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 Text Index for more details.

ATTRINDEX

Signature ATTRINDEX [boolean]
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 Attribute Index for more details.

TOKENINDEX

Signature TOKENINDEX [boolean]
Default true
Summary Creates a token index whenever a new database is created. A token index speeds up searches for single tokens in attribute values. See Token Index for more details.

FTINDEX

Signature FTINDEX [boolean]
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 Full-Text Index for more details.

TEXTINCLUDE

Signature TEXTINCLUDE [names]
Default empty
Summary Defines name patterns for the parent elements of texts that are indexed. By default, all text nodes are indexed.
Name patterns are separated by commas. See Selective Indexing for more details.

ATTRINCLUDE

Signature ATTRINCLUDE [names]
Default empty
Summary Defines name patterns for the attributes to be indexed. By default, all attribute nodes are indexed.
Name patterns are separated by commas. See Selective Indexing for more details.

TOKENINCLUDE

Signature TOKENINCLUDE [names]
Default empty
Summary Defines name patterns for the attributes to be indexed. By default, tokens in all attribute nodes are indexed.
Name patterns are separated by commas. See Selective Indexing for more details.

FTINCLUDE

Signature FTINCLUDE [names]
Default empty
Summary Defines name patterns for the parent elements of texts that are indexed. By default, all text nodes are indexed.
Name patterns are separated by commas. See Selective Indexing for more details.

MAXLEN

Signature MAXLEN [int]
Default 96
Summary Specifies the maximum length for strings to be stored in index structures. The value of this option is assigned once to a new database, and can only be changed by creating a new database or doing a full optimization.

MAXCATS

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

UPDINDEX

Signature UPDINDEX [boolean]
Default false
Summary If turned on, incremental indexing is enabled:
  • The current value of this option is assigned to new databases. It can be changed for existing databases by running OPTIMIZE with the ALL keyword or db:optimize and true() as second argument.
  • After each update, the value indexes are refreshed as well. Incremental updates are currently not available for the full-text index and database statistics.
  • Find more details in the article on Index Structures.

AUTOOPTIMIZE

Signature AUTOOPTIMIZE [boolean]
Default false
Summary If turned on, auto optimization is applied to new databases:
  • With each update, outdated indexes and database statistics are recreated.
  • As a result, the index structures will always be up-to-date.
  • However, updates can take much longer, so this option should only be activated for medium-sized databases.
  • The value of this option is assigned once to a new database. It can be reassigned by running OPTIMIZE or db:optimize.

SPLITSIZE

Signature SPLITSIZE [num]
Default 0
Summary This option affects the construction of new value indexes. It controls the number of index build operations that are performed before writing partial index data to disk:
  • By default, if the value is set to 0, some heuristics are applied, based on the current memory consumption. Usually, this works fine.
  • If explicit garbage collection is disabled when running Java (e.g. via the JVM option -XX:+DisableExplicitGC), you may need to choose a custom split size.
  • You can e.g. start with 1000000 (one million) index operations and adjust this value in the next steps.
  • The larger the assigned value is, the fewer splits take place, and main-memory consumption increases.

Full-Text Indexing

STEMMING

Signature STEMMING [boolean]
Default false
Summary If true, all tokens are stemmed during full-text indexing, using a language-specific stemmer implementation. By default, tokens will not be stemmed. See Full-Text Index for more details.

CASESENS

Signature CASESENS [boolean]
Default false
Summary If true, the case of tokens is preserved during full-text indexing. By default, case is ignored (all tokens are indexed in lower case). See Full-Text Index for more details.

DIACRITICS

Signature DIACRITICS [boolean]
Default false
Summary If set to true, diacritics are preserved during full-text indexing. By default, diacritics are removed. See Full-Text Index for more details.

LANGUAGE

Signature LANGUAGE [lang]
Default en
Summary The specified language will influence the way how texts are tokenized and stemmed. It can be the name of a language or a language code. See Full-Text Index for more details.

STOPWORDS

Signature STOPWORDS [path]
Default empty
Summary If a text file with stop words is specified, frequently used terms contained in that file are ignored when a full-text index is created. A stop word list may decrease the size of the full-text index and speed up your queries. See Full-Text Index for more details.

Query Options

QUERYINFO

Signature QUERYINFO [boolean]
Default false
Summary Prints more information on internal query rewritings, optimizations, and performance. By default, this info is shown in the Info View in the GUI. It can also be activated on command line via -V.

MIXUPDATES

Signature MIXUPDATES
Default false
Summary Allows queries to both contain updating and non-updating expressions. All updating constraints are turned off, and nodes to be returned are copied before they are modified by an updating expression. By default, in compliance with the XQuery Update Facility, this option is set to false. See Returning Results for more details.

BINDINGS

Updated with Version 11: The Clark notation was replaced with the Expanded QNames notation.

Signature BINDINGS [vars]
Default empty
Summary Contains external variables to be bound to a query. The string must comply with the following rules:
  • Variable names and values must be separated by equality signs.
  • Multiple variables must be delimited by commas.
  • Commas in values must be duplicated.
  • Variables may optionally be introduced with a leading dollar sign.
  • If a variable uses a namespace different from the default namespace, it can be specified with the Expanded QNames notation.

This option can also be used on command line with the flag -b.

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   binds the value x to the variable $a with the namespace URI.
  • In the following Command Script, the value hello world! is bound to the variable $GREETING:
SET BINDINGS GREETING="hello world!"
XQUERY declare variable $GREETING external; $GREETING

INLINELIMIT

Signature INLINELIMIT
Default 50
Summary This option controls inlining of XQuery functions:
  • The XQuery compiler inlines functions to speed up query evaluation.
  • Inlining will only take place if a function body is not too large (i.e., if it does not contain too many expressions).
  • With this option, this maximum number of expressions can be specified.
  • Function inlining can be turned off by setting the value to 0.
  • The limit can be locally overwritten via the %basex:inline annotation (follow the link to get more information on function inlining).

UNROLLLIMIT

Signature UNROLLLIMIT
Default 5
Summary This option controls the unroll limit:
  • Loops with few iterations are unrolled by the XQuery compiler to enable further optimizations.
  • If the limit is increased, more optimizations will take place, but the memory consumption and compile time will increase.
  • See Loop Unrolling for more details.

ENFORCEINDEX

Signature ENFORCEINDEX [boolean]
Default false
Summary Enforces index rewritings in path expressions. See Enforce Rewritings for details.

COPYNODE

Signature COPYNODE [boolean]
Default true
Summary When creating new nodes in XQuery via Node Constructors, copies of all enclosed nodes are created, and the copied nodes get new node identities. As a result, the following query yields false:
let $a := <a/>
let $b := <b>{ $a }</b>
return $b/a is $a

This step can be expensive and memory consuming. If the option is disabled, child nodes will only be linked to the new parent nodes, and the upper query returns true.
The option should be used carefully as it changes the semantics of XQuery. It should preferably be used in Pragmas.

TAILCALLS

Signature TAILCALLS
Default 256
Summary Specifies how many stack frames of tail-calls are allowed on the stack at any time. When this limit is reached, tail-call optimization takes place and some call frames are eliminated. The feature can be turned off by setting the value to -1.

WITHDB

Signature WITHDB
Default true
Summary By default, resources specified via fn:doc and fn:collection are looked up both in the database and in the file system. If you always use db:get to access databases, it is recommendable to disable this option:
  • No locks are created for the two functions (see limitations of database locking for more details).
  • Access to local and external resources is faster, as the database lookup is skipped.

DEFAULTDB

Signature DEFAULTDB
Default false
Summary If this option is turned on, paths specified in the fn:doc and fn:collection functions will first be resolved against a database that has been opened in the global context outside the query (e.g. by the OPEN command). If the path does not match any existing resources, it is resolved as described in the article on accessing database resources.

FORCECREATE

Signature FORCECREATE [boolean]
Default false
Summary By enabling this option, database instances are created if the XQuery functions fn:doc and fn:collection are called.

CHECKSTRINGS

Signature CHECKSTRINGS [boolean]
Default true
Summary By default, characters from external sources that are invalid in XML will trigger an error. If the option is set to false, these characters are replaced with the Unicode replacement character FFFD (�). The option affects Java Bindings and string conversion and input functions such as archive:create, archive:extract-text, and archive:update.

WRAPJAVA

Signature WRAPJAVA [mode]
Default some
Summary Defines the way how values that result from Java code invocation are converted to XQuery items. Allowed values: none, all, some, instance, and void. See Java Bindings for further details.

LSERROR

Signature LSERROR [error]
Default 0
Summary This option specifies the maximum Levenshtein error for fuzzy full-text matching. By default, if 0 is assigned, the error value is calculated dynamically. See Fuzzy Querying for more details.

RUNQUERY

Signature RUNQUERY [boolean]
Default true
Summary Specifies if a query is executed or parsed only. This option can also be changed on command line via -R.

RUNS

Signature RUNS [num]
Default 1
Summary Specifies how often a query is evaluated. The result is serialized only once, and the measured times are averages of all runs. This option can also be changed on command line via -r.

Serialization Options

SERIALIZE

Signature SERIALIZE [boolean]
Default true
Summary Results of XQuery expressions are serialized if this option is turned on. For debugging purposes and performance measurements, this option can be set to false. It can also be turned off on command line via -z.

SERIALIZER

Signature SERIALIZER [params]
Default empty
Summary Parameters for serializing query results:
  • Variable names and values are separated by equality signs.
  • Multiple variables are delimited by commas.
  • Commas must be duplicated if they appear as literals in values.

The option can also be used on command line with the flag -s.

Examples
  • indent=yes : enables automatic indentation of XML nodes. This is recommended if whitespaces have been stripped from a document (see Template:Options).
  • encoding=US-ASCII,omit-xml-declaration=no : sets the encoding to US-ASCII and prints the XML declaration.
  • item-separator=,, : separates serialized items by a single comma.

EXPORTER

Signature EXPORTER [params]
Default empty
Summary Contains parameters for exporting resources of a database and writing files after updates via the WRITEBACK option. Keys and values are separated by equality signs, multiple parameters are delimited by commas. See Serialization for more details.
Examples
  • indent=no,omit-xml-declaration=no : disables automatic indentation of XML nodes, outputs the XML declaration.

XMLPLAN

Signature XMLPLAN [boolean]
Default false
Summary Prints the execution plan of an XQuery expression in its XML representation. This option can also be activated on command line via -x.

FULLPLAN

Signature FULLPLAN [boolean]
Default false
Summary Attaches the file path, line and column of the expressions in the original query string to the query plan. Values (items and sequences) have no input information attached.

Other Options

AUTOFLUSH

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

WRITEBACK

Signature WRITEBACK [boolean]
Default false
Summary Propagates updates on main-memory instances of files that have been retrieved via fn:doc and fn:collection back to disk:
  • This option can also be activated on command line via -u.
  • Please take in mind that no backup is created from your original files.
  • The serialization options can be controlled via the EXPORTER option.

MAXSTAT

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

Changelog

Version 11.0
Version 10.0
  • Removed: COMPPLAN, IGNOREHOSTNAME
  • Updated: IGNORECERT: Additionally disable hostname verification.
  • Updated: CATALOG: Renamed (before: CATFILE).
  • Updated: STRIPWS: Renamed (before: CHOP), new default: false.
Version 9.7
  • Updated: GZIP: Support for POST and PUT requests.
Version 9.6
Version 9.5
  • Updated: INLINELIMIT: default reduced to 50.
  • Updated: RESTXQERRORS: additionally suppress stack trace in HTTP response
Version 9.4
Version 9.3
Version 9.2
Version 9.0
Version 8.6
  • Added: FAIRLOCK, PARSERESTXQ
  • Removed: GLOBALLOCK (exclusive use of database lock)
  • Removed: QUERYPATH (will now be internally assigned)
  • Removed: CACHERESTXQ (replaced with PARSERESTXQ)
Version 8.5
Version 8.4
Version 8.3
Version 8.2
  • Removed: EVENTPORT, CACHEQUERY
Version 8.1
Version 8.0
Version 7.8.1
Version 7.8
Version 7.7
Version 7.6
  • Added: GLOBALLOCK
  • Added: store local options in configuration file after # Local Options comments.
Version 7.5
  • Added: options can now be set via system properties
  • Added: a pragma expression can be used to locally change database options
  • Added: USER, PASSWORD, LOG, LOGMSGMAXLEN, WEBPATH, RESTXQPATHHTTPLOCAL, CREATEONLY, STRIPNS
  • Removed: HTTPPATH; HTTPPORT: jetty.xml configuration file is used instead
  • Removed: global options cannot be changed anymore during the lifetime of a BaseX instance
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