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由 Tatsuo Ishii 提交于
The new option specifies length of aggregation interval (in seconds). May be used only together with -l. With this option, the log contains per-interval summary (number of transactions, min/max latency and two additional fields useful for variance estimation). Patch contributed by Tomas Vondra, reviewed by Pavel Stehule. Slight change by Tatsuo Ishii, suggested by Robert Hass to emit an error message indicating that the option is not currently supported on Windows.
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