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54b6cd589a
Previously multi-byte aware truncation was done on every pgstat_report_activity() call - proving to be a bottleneck for workloads with long query strings that execute quickly. Instead move the truncation to the read side, which commonly is executed far less frequently. That's possible because all server encodings allow to determine the length of a multi-byte string from the first byte. Rename PgBackendStatus.st_activity to st_activity_raw so existing extension users of the field break - their code has to be adjusted to use pgstat_clip_activity(). Author: Andres Freund Tested-By: Khuntal Ghosh Reviewed-By: Robert Haas, Tom Lane Discussion: https://postgr.es/m/20170912071948.pa7igbpkkkviecpz@alap3.anarazel.de |
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