on the correspondence between timestamp and offset in Kafka
@ (KAFKA) [Storm, KAFKA, big Data]
On the correspondence between timestamp and offset in Kafka gets the case of a single partition and gets the message from all the partitions at the same
Database storage structure: page, clustered index, nonclustered indexTo understand the database storage structure, understand how the database is accessed first and then understand the database storage structure in principle.I. How data is accessed
first, the storage structureIn SQL Server, there are many different options available for arranging rules.Binary: Sort by the numeric representation of the characters (ASCII, with the number 32 for spaces, and 68 for the letter "D"). Because
First, the storage structureIn SQL Server, there are many different options available for arranging rules.Binary: Sort by the numeric representation of the characters (ASCII, with the number 32 for spaces, and 68 for the letter "D"). Because
1.1.1 SummaryIf we want to optimize the database, we can mainly use the following five methods to optimize the database system.1. Computer Hardware tuning2. Application Tuning3. Database Index Optimization4. SQL statement Optimization5. Transaction
One, the structure of the Hash indexThe hash index consists of the buckets set, and index Key is mapped by the hash function, resulting in a hash value, which is filled into the corresponding bucket, and the hash value of each bucket is different.
The original Http://www.jb51.net/article/28007.htm JS regular function match, exec, test, search, replace, split use the introduction set, learning regular expression of friends can refer to.
Match Method Use the regular expression pattern to
Match Method
Performs a lookup on a string using the regular expression pattern and returns the result that contains the lookup as an array.
Stringobj.match (RGEXP)
Parameters
Stringobj
Required option. A string object or string literal to find it.
article transferred from http://www.jb51.net/article/28007.htmThe purpose is that the content can match the results of all matches, to a few common query keywords, easy to check the person see the article, JS regular match all JS Reg Next, the key
JS regular function match, exec, test, search, replace, split use the introduction set1.match MethodUse the regular expression pattern to perform a lookup on a string and return the result that contains the lookup as an array.Stringobj.match
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