Oracle RAC background process Introduction
There are more processes in the Oracle RAC database than in a single instance database. These processes are unique to RAC and are set to implement cluster database functions. This article will introduce RAC-specific processes.
1. LMSn: Global Cache Service Process.
The LMSn Process maintains the data files in the Global Resource Directory (GRD) and the status of each cached block. LMSn is used to transmit messages and data blocks between RAC instances.
.. Subject to make the service and suffering, limitations 8. frame relay configuration instance // left routerint s1 ip ad 1.1.1.1 255.255.255.0 encapsulation frame-relay bandwidth 64 // right routerint s1 ip ad 1.1.1.2 255.255.0 encapsulation frame-relay bandwidth 64 frame- relay lm-type ansi note: 1. According to the above configuration, the problem is that cisco uses cisco by default and has three types of LMS: ansi cisco q933a, the two ends must
1. Problem description--whatReady to build a lamp environment on a virtual machine's Linux (Centos) system using: sudo yum install httpd; prompts need to be converted to administrator mode.So I switched to root using the sudo command, and I found a hint: LMS is isn't in the sudoers file 2. Cause of the problem--when/why The reason:1.when--When you use sudo to switch root, but not every time you use the command, you will encounter this problem2.w
value is 0;
In addition, C code algorithm is in the frame order of the remote and near-end array xor, the actual application can also be every 1 frames or 2 frames to do XOR, this can expand the search scope.
In
general, the complexity of the time-delay estimation algorithm of WEBRTC is greatly simplified, especially for the mobile terminal, which is more sensitive to the computation volume. For practical applications, the algorithm also has a space for improvement
adaptive algorithm)Lms/nlms/ap/rls is a classic adaptive filtering algorithm, which only briefly introduces the NLMS algorithm used in WEBRTC. Set the remote signal to X (n), the proximal signal is D (n), W (n), then the error signal E (n) =d (n)-W ' (n) x (n) (here ' for the rank), nlms the coefficients of the filter update using the variable step method, that is, step u=u0/(Gamma+x ' (n) *xWhere u0 is the update step factor, gamma is the stabilizin
assign values to a variable in three browsers, ie, Chrome, and FF on his computer. However, in the strict mode of ECMASCRIPT6, the octal direct volume is expressly prohibited.
There are two ways of writing floating-point direct quantity. ① traditional Real-number writing: There are integer parts, decimal and fractional components; ② exponential notation: that is, after the real number followed by the letter E or E, followed by the positive sign, followed by an integer index.
1.1 Overflow of a
values, the value is converted to a special infinity value that cannot participate in the next calculation because infinity is the number that cannot participate in the calculation. If the number is positive, it is converted to Infinity (positive infinity), and if the number is negative, it is converted to-
defined by the properties of the Math object.
JavaScript does not complain when overflow, underflow, and 0 are removed.
Infinity and Nan:javascript predefined global variables ifinity and Nan represent positive infinity and non-numeric.
Overflow: Returns infinity (infinity) When the result of an operation is infinitel
Number
Any non-zero value (including infinity)
0 and NaN
String
Any non-empty string
Null String
Object
Any object
-
4. Number Type
In ECMAScript, there is no separate integer or floating point type, and there is only one Number type, which is expressed in the IEEE754 format (this representation has a rounding error during computation). Here we will not elaborate on the underlying implementation, th
Boolean values. To convert a value to its corresponding Boolean value, you can use the transform functionBoolean ().var hello = ' Hello world! ';var Hello2 = Boolean (hello);Alert (typeof hello);Above is a display conversion, which is a mandatory conversion. In practical applications, there is also an implicit conversion. For example, in the If barThe conditional judgment inside a statement, there is an implicit conversion.var hello = ' Hello world! ';if (hello) {Alert (' If the condition is tr
capability far exceeds that of Turing machine.
The computing power of the Taiji machine is terrible. Many problems that are difficult to compute by the Turing machine can be computed by the Taiji machine! Many limitations of the Turing machine are due to the limitation of "a few infinity", and many problems have been solved in the realm of "an infinite infinity, (pay attention to the number of points in th
blocks between RAC instances. The corresponding Service is GCS (Global Cache Service). LMS is an important part of Cache Fusion. The LMS process is the most active background process on RAC, which consumes a lot of CPU. generally, each instance has multiple LMS processes. The default number of LMS processes for each O
back at the far end of the line. The tester simulates the generation of binary pseudo-random codes, and tests the error rate through self-reception. The testing time should be more than 15 minutes. During strict line acceptance testing, 24 hours of continuous testing is required. The test instrument shall display Pass for the test result without warning.
Test Instrument intervention
Test the Frame Relay LayerAfter ensuring that there is no problem with the physical layer, You can further test t
link identifier. This service is implemented through the Frame Relay virtual circuit, and each frame relay virtual circuit identifies itself with a data link identifier (DLCI. The DLCI value is generally specified by the Frame Relay Service Provider. Frame Relay supports both PVC and SVC. The frame relay Local Management Interface (LMS) is an extension of the basic frame relay standard. It is a signaling standard between the router and the frame rela
There are more processes in the mongolerac database than in a single instance database. These processes are unique to RAC and are set to implement cluster database functions. This article will be unique to RAC
There are more processes in the Oracle RAC database than in a single instance database. These processes are unique to RAC and are set to implement cluster database functions. This article will be unique to RAC
There are more processes in the Oracle RAC database than in a single instan
There are more processes on the RAC database than on a single instance database. These processes are unique to RAC and are set to implement cluster database functions. This article will introduce Rac-specific processes.
1. lmsn: Global cache service process.
The lmsn Process maintains the data files in the Global Resource Directory (GRD) and the status of each cached block. Lmsn is used to transmit messages and data blocks between RAC instances. The corresponding service is GCS (Global ca
false without executing the internal statements in parenthesesConsole.info ('empty ');}If (new Boolean (empty) {// create an object first, and then implicitly convert it to true. The statement in parentheses is executed.Console.info ('empty'); // empty}Console.info (typeof true = 'boolean'); // trueConsole.info (+ true); // 1, unary operator, converted to a value of 1Console.info (+ false); // 0Console.info (''+ true); // true, + operator after overload, converted to string 'true'Lele.info (''+
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