Managing Memory Use The server needs sufficient memory to maintain all MEMORY tables that are in use at the same time. Memory is not reclaimed if you delete individual rows from a MEMORY table. Memory is reclaimed only when the entire table is de...
Manipulating Queries with read_query() The read_query() function is called once for each query submitted by the client and accepts a single argument, the query packet that was provided. To access the content of the packet, you must parse the packet contents manually. For example, you can interce...
Manipulating Results with read_query_result() The read_query_result() is called for each result set returned by the server only if you have manually injected queries into the query queue. If you have not manipulated the query queue, this function is not called. The function supports a single argu...
Maximum number of partitions for NDBCLUSTER tables. The maximum number of partitions that can defined for a NDBCLUSTER table when employing user-defined partitioning is 8 per node group. (See Section 17.1.2, “MySQL Cluster Nodes, Node Groups, Replicas, and Partitions”, for more information about ...
memcached Deployment When using memcached you can use a number of different potential deployment strategies and topologies. The exact strategy to use depends on your application and environmen...
memcached Hashing/Distribution Types The memcached client interface supports a number of different distribution algorithms that are used in multi-server configurations to determine which host should be used when setting or getting data from a ...
memcached Item Statistics To get the items statistics, use the stats items command, or the API equivalent. The items statistics give information about the individual items allocated within a given slab class. STAT items:2:number 1 STAT items:...
memcached Logs If you enable verbose mode, using the -v, -vv, or -vvv options, then the information output by memcached includes details of the operations being performed. Without the verbose options, memcached normally produces no output duri...
memcached Thread Support If you enable the thread implementation within when building memcached from source, then memcached uses multiple threads in addition to the libevent system to handle requests. When enabled, the threading implementation...
MEMORY Tables and Replication A server's MEMORY tables become empty when it is shut down and restarted. If the server is a replication master, its slaves are not aware that these tables have become empty, so you see out-ofdate content if you select data from the tables on the slaves. To synchroni...
