apache in memory database

In the last six months after 2016, as the project needed to support fast data updates and high concurrent workloads for multiple users, I tried water SQL Server 2016 for in-memory OLTP, creating a memory database to implement the project's load requirements, and now the project is nearing the end, the system is running stably, writing a blog, Record the experienc

Configure Apache httpd.conf files General server 2G memory or 4G memory, Threadsperchild 200~300,maxrequestsperchild 1000~3000 I have the following settings in the httpd.conf: The code is as follows Copy Code KeepAlive onMaxkeepaliverequests 50KeepAliveTimeout 5Threadsperchild 100Maxrequestsperchild 100Win32disableacceptex

Apache HttpClient, which is said to be strong, can support a request with a peak of more than 70,000 a second. However, you need to be aware of some resource release and timeout issues. Issue 1: Thread resources cannot be freed, resulting in insufficient memory, or the thread pool being used up. Problem code: private static HttpClient httpclient = Httpclientbuilder.create (). build (); private void Sendhttp

1 #!/usr/bin/env python2 3 ImportOS4 fromSubprocessImportPipe,popen5 6 defgetpids ():7p = Popen (['pidof','httpd'],stdout=pipe,stderr=PIPE)8PIDs =P.stdout.read (). Split ()9 returnPIDsTen One defParsepidfile (PIDs): AHttp_sum =0 - forIinchPIDs: -fn = Os.path.join ('/proc/'I'Status') the With Open (FN) as FD: - forLineinchFD: - ifLine.startswith ('Vmrss'): -Http_mem = Int (Line.split () [1]) +Http_sum + =Http_mem -

SQL Server 2016 in-memory OLTP, in layman's terms, is a memory database that is implemented using memory-optimized tables (memory-optimized table, or MOT), and the MOT resides in memory and is accessed using the Hekaton

Apache newspaper "Memory allocation failed ' Not enough space"

processes, this value is large enough to handle the possible peak of requests; On the other hand, this parameter is based on the response speed of the server, the number of too large will slow. Therefore, it is necessary to balance a reasonable value. The default value on the MPM_WINNT is 64, and the maximum value is 1920. This recommendation is set to 100-500, the server performance is high, the value of a little bit smaller. Maxrequestsperchild This argument is that the

Apache always fills up the memory, 100%CPU

[Translated from mos] Oracle Database In-Memory Advisor, mosin-memory Oracle Database In-Memory Consultant Source:Oracle Database In-Memory Advisor (Document ID 1965343.1) Applicable:En

ABAP provides import/export and set/get parameter statements to store and access user memory, server memory, and database. However, many may not know much about this. Next we will test their differences and relationships through examples. 1. After a user logs on to ABAP memory, a maximum of six windows can be opened fo

One of the memory database R D logs. The strange problem of shared memory Papayas 20091211 I. Sequencing The database is very complex in the application system. Taking ORACLE database as an example, its complexity is no less than that of anyOperating System. Writing a

apache|web| Data | Database sender: xiaoning (I want to fly), letter area: Linux Title: Apache+php3+postgresql as a web-based database platform for Ann Letter station: BBS Water Wood Tsinghua Station (Thu 20 16:00:28 2000) The following describes the installation and configuration method for using

1.1 symptom description Failed to allocate shared memory in Oracle. The ALTER log displays the following error message. Errors in file /oracle/db/diag/rdbms/ora01/ora01/trace/ora01_reco_233670.trc: ORA-00604: error occurred at recursive SQL level 1 ORA-04031: unable to allocate 4064 bytes of shared memory ("shared pool","select local_tran_id, global...","sga heap(1,0)","kglsim heap") Sat Jan 15 09:53:11 201

RECONFIGURE statement to install.Finally execute the following statement to installReconfigure with overrideExecution Result:The command was successfully completed.System Service log:Configuration options ' min server memory (MB) ' has changed from 14 to 16. Please run the RECONFIGURE statement to install.Configuration options ' max server memory (MB) ' has changed from 444 to 266. Please run the RECONFIGU

This problem is actually a matter of space and time. As you can imagine, if you store all URLs in the memory, the memory will soon be fully occupied. However, if a file exists, you must operate the file each time you read or add it. This performance consumption is relatively large. Therefore, we can quickly think of the reason why cache appears on the computer. My design philosophy is to create three levels

How can we optimize the memory usage of oracle? For the convenience of development, we want to reduce the memory occupied by oracle at ordinary times. The following describes how to reduce memory usage by adjusting oracle memory parameters. Solution: sqlplus“/assysdba" createpfile='d:/cj.ora'fromspfile; G