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Introspection functions

You can use functions described in this chapter to introspect ELF and DWARF for query profiling.

Note

These functions are slow and may impose security considerations.

For proper operation of introspection functions:

  • Install the clickhouse-common-static-dbg package.

  • Set the allow_introspection_functions setting to 1.

    For security reasons introspection functions are disabled by default.

ClickHouse saves profiler reports to the trace_log system table. Make sure the table and profiler are configured properly.