best ebooks to read

Implement read/write locks and read/write locksExclusive lock disadvantagesData is shared among multiple threads. The common practice is to lock read/write, that is, only one thread can read or write data at the same time point to ensure data consistency, that is, thread security. For example, the following pseudocode

Detailed description of the implementation method of CodeIgniter read/write splitting, and codeigniter read/write. CodeIgniter: detailed description of the implementation method of read/write splitting. the example in this article describes the implementation method of codeigniter read/write splitting. For your referen

CodeIgniter Read and write separation implementation method detailed, CodeIgniter read and write In this paper, the implementation method of CodeIgniter read-write separation is described. Share to everyone for your reference, as follows: The current server only do the master-slave, not configured read-write separatio

Learn MySQL in one step-Consistency non-locked read and locked read, mysql-ConsistencyConsistent nonlocking read) Consistent non-locked read is the InnoDB Storage engine that reads data from the database at the current execution time through multi versioning. If an exclusive lock is applied to the

In Query performance optimization, Logical read is very important, and its count is generally proportional to the number of result sets queried, and is proportional to the speed of data read.1,set STATISTICS IO Explicit disk IO informationSyntaxSET STATISTICS on | OFF } Output Item meaning Table Name of the table. Scan Count Number of scans performe

Tags: example server server value occupancy information contradictory data page tailTable ' T_epz_inout_entry_detail '. Scan count 1, logic read 4,825 times, physical read 6 times, pre-read 19,672 times.SQL Server Database engine when a query statement is encountered, the SQL Server database engine generates an execution plan (consuming CPU and memory resources)

This article will use a GitHub open source component technology to read and write Siemens PLC data, using the Ethernet-based TCP/IP implementation, no additional components, read operations as long as the background thread will not be stuck thread, this component supports super convenient high-performance read and write operationGitHub Address: Https://github.com

1. preparation. The VFS layer and some initialization operations are used to prepare for real read operations. First, the user process sends a read request through the read system call: File/fs/read_write.cAsmlinkage ssize_t sys_read (unsigned int FD, char _ User * Buf, size_t count){Struct file * file;Ssize_t ret =-ebadf;Int fput_needed; File = fget_light (FD,

The read () and read (byte [] B) methods exist as abstract methods in the abstract class inputstream. The latter is not. The JDK API describes the two methods as follows: 1: Read ():Reads the next byte of data from the input stream, and returns the int byte value ranging from 0 to 255. -1 is returned if no Bytes are available because it has reached the end of the

Most of the questions are as follows: 1: Write some content to a file, in another process/thread/subsequent operation to read the contents of the file when the report exception, prompt System.IO.IOException: The file "XXX" is being used by another process, so the process cannot access this file. 2: After some operation on a file (read/write), then want to append still reported System.IO.IOException: File

lost.2) Dirty read: Dirty read refers to when a transaction is accessing the data, and the data is modified, and this modification has not been committed to the database, then another transaction also accesses the data, and then used this data.For example:Zhang San's salary was 5000 and transaction a changed his salary to 8000, but transaction a was not yet submitted.MeanwhileTransaction B is reading Zhang

The first example of file read/write, the first example of read/write First, open VS2013 and create a form application. Requirement: to implement this function, click the text box and the file dialog box will pop up. Let's select a file and click OK to read the content of the specified file, then we will write the read