CodeQL documentation

execute query-server


codeql execute query-server [--threads=<num>] <options>...


[Plumbing] Support for running queries from IDEs.

This command is only relevant for authors of QL language extensions for IDEs. It is started by the IDE plugin in the background and communicates with it through a special protocol on its standard input and output streams.

The IDE extensions should use codeql resolve ram to construct options for RAM limits before starting the query server.



[Advanced] Include tuple counts for each evaluation step in the query evaluator logs. (This can be useful for performance optimization of complex QL code).


[Advanced] Set the timeout length for query evaluation, in seconds.

The timeout feature is intended to catch cases where a complex query would take “forever” to evaluate. It is not an effective way to limit the total amount of time the query evaluation can take. The evaluation will be allowed to continue as long as each separately timed part of the computation completes within the timeout. Currently these separately timed parts are “RA stages” of the optimized query, but that might change in the future.

If no timeout is specified, or is given as 0, no timeout will be set (except for codeql test run, where the default timeout is 5 minutes).

-j, --threads=<num>

Use this many threads to evaluate queries.

Defaults to 1. You can pass 0 to use one thread per core on the machine, or -N to leave N cores unused (except still use at least one thread).


[Advanced] Aggressively write intermediate results to the disk cache. This takes more time and uses (much) more disk space, but may speed up the subsequent execution of similar queries.


[Advanced] Don’t clean up the disk cache after evaluation completes. This may save time if you’re going to do codeql dataset cleanup or codeql database cleanup afterwards anyway.


Set the maximum amount of space that the disk cache for intermediate query results can use.

If this size is not configured explicitly, the evaluator will try to use a “reasonable” amount of cache space, based on the size of the dataset and the complexity of the queries. Explicitly setting a higher limit than this default usage will enable additional caching which can speed up later queries.


[Advanced] Set target amount of free space on file system.

If --max-disk-cache is not given, the evaluator will try hard to curtail disk cache usage if the free space on the file system drops below this value.


[Advanced] Set target fraction of free space on file system.

If --max-disk-cache is not given, the evaluator will try hard to curtail disk cache usage if the free space on the file system drops below this percentage.


A CSV file that contains rows for external predicate <pred>. Multiple --external options can be supplied.

Common options

-h, --help

Show this help text.


[Advanced] Give option to the JVM running the command.

(Beware that options containing spaces will not be handled correctly.)

-v, --verbose

Incrementally increase the number of progress messages printed.

-q, --quiet

Incrementally decrease the number of progress messages printed.


[Advanced] Explicitly set the verbosity level to one of errors, warnings, progress, progress+, progress++, progress+++. Overrides -v and -q.


[Advanced] Write detailed logs to one or more files in the given directory, with generated names that include timestamps and the name of the running subcommand.

(To write a log file with a name you have full control over, instead give --log-to-stderr and redirect stderr as desired.)