stardog query explain
Description
Returns an execution plan for the given query.
Usage
stardog [ --krb5 ] [ --krb5-disable-rdns ] query explain [ {-b | --bind} <variables to bind>... ] [ {-g | --named-graph} <Named graph> ] [ {-h | --hint} <query hints>... ] [ {-l | --limit} <N> ] [ {-o | --offset} <N> ] [ {-p | --passwd} <password> ] [ {-P | --ask-password} ] [ --profile ] [ {-r | --reasoning} ] [ --run-as <username> ] [ --schema <mSchema> ] [ --timeout <N[h|m|s]> ] [ {-u | --username} <username> ] [ {-v | --verbose} ] [--] <database> <query>...
Options
| Name, shorthand | Description |
|---|---|
-b <variables to bind>, --bind <variables to bind> | Variable bindings. One or more variable bindings to apply before executing query. Each binding is provided as a ‘var=value’ pair; multiple bindings should be separated with whitespaces. Variables must exist in the query and the value should be a valid RDF term in Turtle syntax. Namespaces stored in the database can be used in the values; e.g. x=ex:name. Quotes are needed around IRIs to avoid special characters to be evaluated by the shell; e.g. y=”http://example.org/test”. In Turtle syntax literals have quotes which need to be escaped to differentiate them from shell quotes; e.g. z="value". Finally, if a literal contains special characters or a space then additional quotes are needed for the shell; e.g. z=”"another value"”. |
-g <Named graph>, --named-graph <Named graph> | Default graph to run the queries against. |
-h <query hints>, --hint <query hints> | Query hints. One or more query hints to pass to the query execution engine. Each hint is provided as a ‘hint=value’ pair; multiple hints should be separated with whitespaces. The hints will apply to the query as a whole, i.e. as if they are specified at the top of the query string, not in some specific part of the query. |
--krb5 | Use the Kerberos environment. |
--krb5-disable-rdns | Disable reverse DNS lookup for Kerberos clients. |
-l <N>, --limit <N> | Limit the number of results the query will return. Specifying the limit will override any limit specified in the original query string |
-o <N>, --offset <N> | Skip the first N results the query will return. Specifying the offset will override any offset specified in the original query string |
-p <password>, --passwd <password> | Password. |
-P, --ask-password | Prompt for password. |
--profile | Enable query profiling to measure runtime and memory footprint of query operators |
-r, --reasoning | Turn reasoning on with the default schema. |
--run-as <username> | User to impersonate when running the command |
--schema <mSchema> | Turn reasoning on with the specified schema. |
--timeout <N[h|m|s]> | Timeout for the query in ms. An optional time unit can be specified by the suffix ‘h’ (for hours), ‘m’ (for minutes), or ‘s’ (for seconds). Timeout value of 0 results in no timeout. Only applicable for use with the –profile option. |
-u <username>, --username <username> | User name. |
-v, --verbose | Flag that can cause more detailed information to be printed such as errors and status. Exact output depends upon the command and options used. |
-- | This option can be used to separate command-line options from the list of argument(s). (Useful when an argument might be mistaken for a command-line option) |
<database> <query> | The name of the database or the full connection string of the database to connect to. If only the name is provided, the default server URL will be prepended to the name of the database in order to construct the connection string. Connection parameters such as ‘;reasoning=true’ can be included in the provided database name. Connection parameters specified like this can be overridden by specific options on the command. The default server URL will be read from the JVM argument ‘stardog.default.cli.server’. If the JVM argument is not set, the default value ‘http://localhost:5820’ is used. If the server URL has no explicit port value, the default port value ‘5820’ is used. To use a secure connection, you should specify the full connection string and postfix ‘s’ to the protocol, e.g. https. The subsequent argument is the SPARQL query string to execute. This can either be a file name, a SPARQL query string, or a stored query name. |
Discussion
Given a query, this command returns the optimized execution plan for the query against a database. The
Examples
Return an execution plan for the specified query against the db ‘myDb’:
$ stardog query explain myDb "SELECT ?title WHERE { <http://example.org/book/book1> <http://purl.org/dc/elements/1.1/title> ?title . }"