apache in memory database

The current memory is cheap, and the servers with 16 GB memory or above are already quite common. The large memory indeed speeds up the running of your server. However, some analysis reports generate n The data in the table is inverted, from which the table is total to which table. this process may affect normal services. slowing down Server Response Time r

Http://guoyunsky.iteye.com/blog/759148 SOLR has a handy processor called dataimporthandler, which can configure various data sources by configuring the configuration db-data-config.xml and thenIt is convenient for us to develop and index the imported data. however, there has been a problem before importing data from the database, that is, if the data in the database is too large, it will cause

Objects | data | database | middle tier In XML can be viewed as a serialized object structure that can be exchanged between different languages and platforms. It actually has the same need: If the XML is not simply seen as an HTML-like presentation layer style, but the form of object storage, then read XML objects must have a problem of overloading and maintenance, and to make the program efficient, it must be completed by the program container , a

Python Memory database and remote serviceThe Python Memory database code that requires import refers to the following link:http://blog.csdn.net/ubuntu64fan/article/details/50424683Now the question:Create a Memory data service that can be connected to local or remote users, c

screen to view and then print, then the output to the computer screen content to print, rather than to get the latest data from the database to print.(4) generate Phantom dataT1 after some records have been read from the database according to certain criteria, T2 deleted some of the records, and when T1 again reads the data in the same condition, some records are found to disappearT1 After some data record

pages of memoryCat/proc/meminfo | Grep-i hugepages Note 1: the constant "sysctl-p"Until the setpoint is reached, or the system is restarted;Set Memory LockConfiguring the Limits.conf fileVi/etc/security/limits.conf added or modified to the following:Oracle Soft Memlock-1Oracle Hard Memlock-1Note:-1 is not limited, if set, the Memlock data is larger than the number of large pages of memoryView Changes(Oracle User)Ulimit-lConfigure swap SpaceEmpty swap

It takes a day and a half to resolve the client connection to the Oracle database on the server side, unable to connect the problem. Ora-01034:oracle Not available (ORACLE does not exist), ora-27101:shared memory realm does not exist analysis:A few days ago you can also connect to the database, but yesterday, the local no reason to connect to the server

Label:Previously used is PostgreSQL, because of the speed of the reason, so intends to unify the data into the HDFs, but a write to HDFs is very slow, all write to the local file and then to HDFs is also the same slow, so that this article, will be part of the first in the memory database, And then write to HDFs, so that the speed of data extraction and writing over several times! Well, tell me how to use H

The last one aroused everyone's discussion, looked at the discussion I was more dizzy, this also blame I did not say clearly, so again make up a continuation of the question to say clearly. Notebook configuration Cpu:core 2 7250 2.0G Memory: 4G, where 2G is set up as a virtual hard disk, virtual hard disk software: Ramdisk. READ: 5.5G, write: 3.5G. Hard disk: 160G, average read: 70m/s. Write: Unknown, not read fast. (The read speed of

getreadabledatabase directly to get the database Sqlitedatabase object. Here is how to voluntarily choose to have an SD card, there is an SD card, not stored in memory.Public Dbopenhelper (Context context) {//define ConstructorsSuper (context, DBNAME, null,version);//Overriding the constructor of a base class}This constructor is changed to the endPublic Dbopenhelper (Context context,string name) {//define ConstructorsSuper (context, name, null,versio

maximum value SQL> Alter systemSetShared_pool_size =200m Scope=spfile;//Modify Shared MemorySql> alter systemSetDb_cache_size =250m Scope=spfile;//Modifying the data cacheSql> alter systemSetJava_pool_size =144m scope=SPFile; SQL> Alter systemSetLarge_pool_size =24m scope=SPFile; System default 150 threads allocation: SGA (164M)=db_cache (24M) +shared_pool (80M) +java_pool (48M) +Large_pool (8M) The knowledge about Oracle database shared

The unit test for data access code is in an awkward position. If the operation is not performed for a real database, it cannot capture database-specific errors, such as whether the SQL statement syntax is correct, whether the operation violates the database constraints and whether the transaction is correctly committed. In addition, tests should be isolated. One

(currently only for SQL Server 2000) can improve a lot Virtual hard disk: is to use memory as a hard disk, such as 2G of memory, then you can take out 1G of memory as a hard disk to use. Since I know the "virtual hard disk" This dongdong, I have been thinking about how to put this virtual hard drive to the extreme, the last one also wrote a number of simple app

This article mainly introduces the introduction and getting started examples of the memory database LokiJS implemented by JavaScript. LokiJS is a memory database that puts performance considerations first and uses JavaScript for writing, if you need it, refer to LokiJS as a memory