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Merge pull request #52309 from rschu1ze/qc-event-descr

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Minor: Update description of events "QueryCacheHits/Misses"
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Robert Schulze 2023-07-25 13:54:06 +02:00 committed by GitHub
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src/Common/ProfileEvents.cpp
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@ -58,8 +58,8 @@
M(TableFunctionExecute, "Number of table function calls.") \ M(TableFunctionExecute, "Number of table function calls.") \
M(MarkCacheHits, "Number of times an entry has been found in the mark cache, so we didn't have to load a mark file.") \ M(MarkCacheHits, "Number of times an entry has been found in the mark cache, so we didn't have to load a mark file.") \
M(MarkCacheMisses, "Number of times an entry has not been found in the mark cache, so we had to load a mark file in memory, which is a costly operation, adding to query latency.") \ M(MarkCacheMisses, "Number of times an entry has not been found in the mark cache, so we had to load a mark file in memory, which is a costly operation, adding to query latency.") \
M(QueryCacheHits, "Number of times a query result has been found in the query cache (and query computation was avoided).") \ M(QueryCacheHits, "Number of times a query result has been found in the query cache (and query computation was avoided). Only updated for SELECT queries with SETTING use_query_cache = 1.") \
M(QueryCacheMisses, "Number of times a query result has not been found in the query cache (and required query computation).") \ M(QueryCacheMisses, "Number of times a query result has not been found in the query cache (and required query computation). Only updated for SELECT queries with SETTING use_query_cache = 1.") \
M(CreatedReadBufferOrdinary, "Number of times ordinary read buffer was created for reading data (while choosing among other read methods).") \ M(CreatedReadBufferOrdinary, "Number of times ordinary read buffer was created for reading data (while choosing among other read methods).") \
M(CreatedReadBufferDirectIO, "Number of times a read buffer with O_DIRECT was created for reading data (while choosing among other read methods).") \ M(CreatedReadBufferDirectIO, "Number of times a read buffer with O_DIRECT was created for reading data (while choosing among other read methods).") \
M(CreatedReadBufferDirectIOFailed, "Number of times a read buffer with O_DIRECT was attempted to be created for reading data (while choosing among other read methods), but the OS did not allow it (due to lack of filesystem support or other reasons) and we fallen back to the ordinary reading method.") \ M(CreatedReadBufferDirectIOFailed, "Number of times a read buffer with O_DIRECT was attempted to be created for reading data (while choosing among other read methods), but the OS did not allow it (due to lack of filesystem support or other reasons) and we fallen back to the ordinary reading method.") \