massive games

Yesterday encountered the need to delete a large amount of files under Linux, you need to delete hundreds of thousands of files. This is a log of the previous program, growing fast and useless. This time, we often use the delete command RM-FR * is not useful, because the time to wait too long. So we have to take some very good measures. We can use rsync to quickly delete large numbers of files.1. Install rsync First:yum install rsync2. Create an empty folder:mkdir /tmp/test3. Delete the target d

To analyze the performance of inserting massive data into the Cassandra Cluster or Oracle, that is, the insertion rate, we sampled the inserted data using a Java program, and finally plotted the sample results with Jfreechart. For the sake of fairness, we did the following: 1. All the loop variables are placed outside the loop 2. For Cassandra, the Replication-factor setting is 1, so inserting the data does not require inserting additional backups.

For the massive data inserts and updates, ADO. NET is not really as good as JDBC, JDBC has a unified model for batch operations. Use it.Very convenient:PreparedStatement PS = conn.preparestatement ("Insert or update arg1,args2 ...");And then you canfor (int i=0;iPs.setxxx (REALARG);.....Ps.addbatch ();if (i%500==0) {//Suppose 500 submit oncePs.executebatch ();Clear Parame Batch}}Ps.executebatch ();This operation not only brings extremely large perform

Oceanbase is a high-performance distributed database system that supports massive data, and implements hundreds of millions of records, hundreds of TB data across the row across the transaction, by the Taobao core System Research and Development Department, operational dimension, DBA, advertising, application research and development departments together to complete. In the design and implementation of Oceanbase temporarily abandoned the functions of

"Data compression" used to be a new word for me, not have not heard, but did not actually use, has been doing project manager work is also designed to the database operations, but because the storage design is more abundant, in addition to the performance of the operation can allow customers to accept, so the compression technology is basically not how to use, It was also feared to have a negative impact on DML operations! The reason we have to experiment with this technology is because we have

following code, close the transaction commit, wait for the update and then a one-time commit, to the original 10 hours of work into 10 minutes. This reads a more than 7 million-line file. Update records about 300多万条. My $db _handle = Dbi->connect ("dbi:mysql:database= $database; host= $host", $db _user, $db _pass, {' RaiseError ' = + 1, autocommit = 0}) | | Die "Could not connect to database: $DBI:: Errstr"; eval {while (!eof ($FD)) { $CloudID = It starts with

, and the set-based approach is usually more efficient.27. As with temporary tables, cursors are not unusable. Using Fast_forward cursors on small datasets is often preferable to other progressive processing methods, especially if you must reference several tables to obtain the required data. Routines that include "totals" in the result set are typically faster than using cursors. If development time permits, a cursor-based approach and a set-based approach can all be tried to see which method w

indexes in the opposite direction cause the system to be inefficient. Each index is added to the table, and maintenance of the index collection will be done with the corresponding update work.2, in the vast number of queries as far as possible to use the format conversion.3. Order BY and Gropu by: using both the order by and the group by phrase, any index contributes to the performance improvement of select.4. Any action on a column will result in a table scan, which includes database tutorial

continuous data lookups, nonclustered indexes are weak because nonclustered indexes need to find a pointer to each row in the B-Tree of the nonclustered index, and then go to the table where the data is found, so performance can be compromised. Sometimes it's better not to add nonclustered indexes.Therefore, in most cases, the clustered index is faster than the nonclustered index. But there can only be one clustered index, so choosing the columns that are applied to the clustered index is criti

number of parallel queries can be adjusted appropriately (generally not more than 8);2) Index and table separation, separate temporal table space;3) Adjust the table to nologging state, or specify nologging when creating an index;4) We can adjust the relevant parameters of the database to accelerate the creation of index speed, examples are as follows:Sql> alter session setdb_file_multiblock_read_count=1024;Sql> alter session setdb_file_multiblock_read_count=1024;Sql> alter session SET Events '

Javascript is combined with Flexbox to implement slide puzzle games and flexbox puzzle games The slide puzzle is to divide an image into several equal parts, disrupt the order (), and then splice it into a complete picture by sliding. To implement a puzzle game, you need to consider how to randomly disrupt the order, how to swap the positions of two images, and so on. However, after the Flexbox layout is u

Open source gamesHttp://www.linuxgames.com/Https://m3ge.dev.java.net/Http://en.wikipedia.org/wiki/List_of_game_engines#Open-source_enginesHttp://en.wikipedia.org/wiki/Open_source_video_gameThe_battle_for_wesnothHttp://en.wikipedia.org/wiki/Warzone_2100Http://www.dmoz.org/Computers/Open_Source/Software/Games/Daimonin-free isometric real-time MMORPG. 2d/3D graphics, 3D sound effects, digital ambient music.Http://www.identicalsoftware.com/ogs/Http://wiki

conditions to play VR games? To play VR games must have a set of VR equipment, the first VR equipment is the legendary helmet-type virtual game machine, as shown in the following figure, matching the corresponding protection equipment. The Oculus Rift, designed for virtual reality games, has been opened for a price of 599 dollars (excludi

One of the online development of ghost-hunting games, the development of ghost-hunting games Friends who have seen a well-known mango TV program should be "who is undercover" will not be unfamiliar: N people involved, N-1 people get the same word (such as steamed buns ), when one person gets another word (such as Steamed Stuffed Bun), N people can only see their own words, so no one knows whether they are d

Combination games and element combination games Before introducing SG functions and SG theorem, let's first introduce the verbs and verbs.The concept of "yes" and "yes": "Yes". In other words, if both parties operate correctly, they will be defeated. N: Yes. In this case, if both parties operate correctly, yes. Vertices and vertices: 1. All endpoints are vertices P. (We use this as the basic premise for rea

Javascript HTML5 canvas implements brick-hitting games and html5 brick-hitting games This example shows a small game, based on the canvas in HTML5. The game is mainly used to bounce a small ball and hit a small square. In the code, we mainly implement the generation of small blocks, the listening of keyboard key events, the bounce of ball movement and hitting the wall, and how to eliminate small blocks. The

Massive Data Query progress waiting, Data Query progress The main code. Modify it according to the actual situation. Response. write (" In addition, you need to add the namespace using System. Threading;

the frequent call business, as far as possible within the local process, for example, for the client call API setting alias and subscription topic, First check that the cache has been set, only if there is no setting to send back-end service, after optimization, the business pressure of the backend service is greatly reduced.some insights in the development of millet push processServices to support horizontal scaling, as far as possible to be stateless, or use a consistent hash of the partition

Experience in using SqlBulkCopy (massive data import) and experience in using sqlbulkcopy Article reprinted original address: http://www.cnblogs.com/mobydick/archive/2011/08/28/2155983.html Recently, due to the lazy work of previous designers, the extended information of a table is stored in a "key-value" table instead of in the paradigm. For example: For each piece of information in the primary table, there are about 60 "keys". That is to say, each