# Runtime Configuration

PLV8 has some configuration variables that can be set either in `postgresql.conf`
or at runtime using `SET`.

| Variable                 | Description                                                                      | Default     |
| ------------------------ | -------------------------------------------------------------------------------- | ----------- |
| `plv8.start_proc`        | PLV8 function to run once when PLV8 is first used                                | _none_      |
| `plv8.icu_data`          | ICU data file directory (when compiled with ICU support)                         | _none_      |
| `plv8.v8_flags`          | V8 engine initialization flags (e.g. --harmony for all current harmony features) | _none_      |
| `plv8.execution_timeout` | V8 execution timeout (when compiled with EXECUTION_TIMEOUT)                      | 300 seconds |
| `plv8.memory_limit`      | Memory limit for the per-user heap usage on each connection, in **MB**           | 256         |