Where is the query itself? And, what storage engine? myisam or innodb? Even with the query cache disabled, the index and/or the data could have already been cached in the memory in other buffers.Navigate: Previous Message• Next Message Options: Reply• Quote ...
Let’s say, you want to analyze the stages of a query that is spending most of the time in, you need to enable the respective logging using the below query. 1 2 3 4 5 MySQL> update performance_schema.setup_consumers set ENABLED='YES' where NAME='events_stages_current'; Query OK, ...
MySQL does not handle cached data in one big chunk; instead it is handled in blocks. The minimum amount of memory allocated to each block is determined by thequery_cache_min_res_unitvariable. The default value is 4096 bytes or 4KB. query_cache_sizecontrols the total amount of memory alloc...
If the content is found in the cache, then it is being served immediately to the client (avoiding PHP processing, MySQL queries, etc.). This is called a cache HIT. On the other hand, if the content is not found in the cache, the web server has to fetch it from the origin server ...
query_cache_size: Enable the query cache and set an appropriate size to cache query results. max_connections: Configure the maximum number of concurrent connections based on your application’s requirements. key_buffer_size: Set the size of the buffer used for index blocks to enhance index searc...
query_cache_size: This setting controls the size of the query cache, which stores previously executed queries for faster re-execution. Increasing this value can improve performance for repetitive queries, but it also consumes more memory and might not be effective for dynamic queries. thread_pool_...
-DMYSQL_DATADIR=./mysql/data -DWITH_INNODB_MEMCACHED=ON -DENABLE_DOWNLOADS=1 Shell>make Shell>make install Now let's check if the memcached plugin is built. Shell>pwd /home/loushuai/src/mysql-server/trunk/bld_memcached/mysql/lib/plugin ...
per second. TheThreads: 6 ( 5/ 0)segment indicates there are total 6 connected threads, 5 are active (one is sleeping), and there are 0 threads in the thread cache. The last field in the third line shows the query percentages, like in the previous line, but since last mytop refresh...
MySQL also requires memory for the table definition cache. The table_definition_cache system variable defines the number of table definitions that can be stored in the table definition cache. If you use a large number of tables, you can create a large table definition cache to speed up the ...
Use 6.0.6 version, enable useServerPrepStmts. The statement is cached by connection, the statement will remain until the connection is really closed. Suppose a statement query "select * from xxx", then "alter table xxx add column fx...", ...