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Apr 8, 2016 at 15:45 comment added Rick James table_open_cache may be too low, based on the very high Opened_tables. (Can't tell for sure without Uptime.)
Apr 8, 2016 at 15:35 comment added Rick James add a couple of paragraphs about the QC
Apr 8, 2016 at 15:35 history edited Rick James CC BY-SA 3.0
added a couple of paragraphs about the QC
Apr 8, 2016 at 13:00 comment added jkt123 Also, could you help me understand why a large query_cache_size would cause lengthy stalls? I thought that the query cache was to some degree for MyISAM what the buffer pool is for InnoDB.
Apr 8, 2016 at 12:49 comment added jkt123 No, I've never seen that many simultaneous connections, but I was maxing out with the default of 150. I did not raise tmp_table_size or max_heap_table_size. key_buffer_size is slightly bigger, but nowhere near 20% RAM. See my edited answer for variables and status.
Apr 8, 2016 at 2:50 history answered Rick James CC BY-SA 3.0