WebNov 7, 2024 · I could have disabled Query Cache completely, but with the new settings, there’s still a +70% hit rate. However, eventually, MySQL Query Cache was completely disabled on that 32GB server for improved performance (read on): query_cache_type = 0 query_cache_size = 0. MySQL Query Cache monitor ... WebJul 2, 2012 · Table cache hit rate: 0% (400 open / 1M opened) ... Splitting index and data partitions on different disks allows data to be read or written on one disk whie to complete while other disk is performing a seek. ... How to automatically Reset Query Cache for improve table cache hit in MySQL? 2. InnoDB Buffer Pool Hit Rate. 4. Mysql Optimization ...
Why you should ignore MySQL’s key cache hit ratio
WebI ran the excellent MySQL performance tuning script and started to work through the suggestions. One I ran into was. Current table_cache value = 4096 tables You have a total of 1073 tables. You have 3900 open tables. Current table_cache hit rate is 2%, while 95% of your table cache is in use. You should probably increase your table_cache. WebJul 31, 2024 · Key_writes : The number of physical writes of a key block from the MyISAM key cache to disk. You want the ratio Key_writes / Key_write_requests to be as close to 1 … spiff and span
MySQL :: MySQL Enterprise Monitor 8.0 Manual :: 19.5 Memory Usage Advisors
WebThe USE INDEX ( index_list) hint tells MySQL to use only one of the named indexes to find rows in the table. The alternative syntax IGNORE INDEX ( index_list) tells MySQL to not use some particular index or indexes. These hints are useful if EXPLAIN shows that MySQL is using the wrong index from the list of possible indexes. WebJan 22, 2024 · What’s A Good Hit Rate. Obviously, the higher the hit rate, the more likely it is that query cache is helping. Much of my work is done with Magento, which is typically … WebMar 27, 2012 · 1 Answer. open_tables is the number of tables you have open right now; opened_tables is the total number of table-opening operations since the server started. For example, if you have performed 100 table opening operations and have 25 tables open now, your table cache hit rate is 25/100 = 1/4. The rationale is that you are trying to measure ... spiff and brit