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This process is highly dependent on your exact application.<br />
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Different applications implement this differently.<br />
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Maybe clarify if you're asking about a specific application you already use or you're developing some sort of application, where you'd like to bake in the ability to run online/offline + sync up online, after you've been running your app offline for a while.
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Yes we are developing some sort of application data will be captured in offline local database it will be synchronize when connected to network
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The simple way to do this is set your row data as having a primary key of instance id + timestamp + sequence number.<br />
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Instance ID - machine or install, might be many on one machine.<br />
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Timestamp - when each row created.<br />
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Sequence - This is an auto-increment number used as a tie breaker, in the odd even you have two exactly the same timestamps on the same instance. You can get rid of this if you wrap your INSERT statement in a try/catch mechanism + just retry repeatedly, until you get a unique timestamp. When I'm coding this type of system, I use a try/catch loop, so I can avoid creating the Sequence column.<br />
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Then whenever any offline instance connects, you do the following.<br />
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1) Lookup the latest instance + timestamp.<br />
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2) Create a SELECT to pull all data &gt;&nbsp;(last instance + time stamp).<br />
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3) INSERT all this data into your online/common database, which will always produce only new records being added from all your offline instances.<br />
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Pretty standard code.<br />
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You might even find an entire online/offline library on GitHub which implements this entire system in your target language.
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How to get the instance Id please explain offline. To online once again
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Each time your application is installed anywhere or reinstalled anywhere, the installation process will do a callback to some central server + ask for an instance ID. This is just a sequential number assigned, to ensure each application install or reinstall has it's own instance ID.<br />
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Likely you'll maintain a correlation of license key to instance, so you know the user of your instance too.
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Suppose I have huge amount of data how could I perform online to offline and offline to online
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Data is data, so make no real difference of the size... to a point...<br />
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If you're trying to transfer Gigabytes of data each connection, then you do have a problem.<br />
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Speed of your client side connections, which may be running on a slow 3G network.<br />
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The normal way to handle large transfers is via logic similar to rsync.... You compress data + transfer data in chunks, so if you've been transferring data for an hour + your connection breaks, you don't start over syncing all data, you pick up where you left.<br />
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If you use the above database design, this all occurs as a side effect of the design, as each time you pull one row of data (one chuck), the database gets updated + if you connection breaks, then you start over again.<br />
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Now if the case of massive data, you'd likely batch a group of rows/records together to transfer, to avoid having a connection latency penalty for every data transfer.<br />
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Again, if this is your first time designing a system like this, hire someone proficient in your language of choice (server + client site) who understands database design + designs of systems like this.
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I want to only design database that is java language how could I proceed with database deign
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Could you please Explain with simple words for below sentence sequence - This is an auto-increment number used as a tie breaker, in the odd even you have two exactly the same timestamps on the same instance. You can get rid of this if you wrap your INSERT statement in a try/catch mechanism + just retry repeatedly, until you get a unique timestamp. When I'm coding this type of system, I use a try/catch loop, so I can avoid creating the Sequence column.
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Auto Incrementation is basic SQL.<br />
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<a href="https://mariadb.com/kb/en/library/auto_increment/" rel="ugc"><u>https://mariadb.com/kb/en/<wbr />library/au<wbr />to_increme<wbr />nt</u></a> provides a good overview.<br />
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In summary, if rows are setup with an auto increment (sequence) field + time stamp field both, then multiple rows can contain duplicate time stamps. Otherwise you'll end up with a problem ordering your data on the server side, if data ordering is required.<br />
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I'd recommend you hire a database designer for your project, as they'll understand why a tie breaker (auto increment) field is required, if data ordering is required.<br />
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They will also understand about how to implement a looped try/catch if you'd like to skip the auto increment field, to reduce database row length.<br />
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The way this works is you try an INSERT on a row with a primary field of type TIMESTAMP, then you'll have a failure if the exact TIMESTAMP exists, then you just loop + keep trying. Each time you loop, the TIMESTAMP will change by a few microseconds, so likely any loop will only run &nbsp;once or maybe twice before you have a new + unique TIMESTAMP, which will allow your INSERT to succeed.<br />
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This is all basic SQL. Likely almost any database designer can implement this type code.
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Rsynch and transfer data in chunk means<br />
This is my last question after that I will close the question
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I think you're asking about the commonly available <a href="https://en.wikipedia.org/wiki/Rsync" rel="ugc"><u>rsync</u></a> program, which is one of the unsung hero workhorses of the entire Internet.<br />
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The approach of <a href="https://en.wikipedia.org/wiki/Rsync" rel="ugc"><u>rsync</u></a> + similar utilities, is to transfer data in a way as to be able to resume broken connections/transfers at the point the transfer breaks. So usually blocks of information or file stamp/checksum logic figures out how to arrange this.<br />
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So a chunk might be a chunk of data or simply a diff between a remote file + local file, then only transfer the diff (rather than the whole file).<br />
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Where <b>diff</b> means only the few bytes difference between two files.
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I really think you'd be served working with a good application + database designer as a first step for your project.<br />
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This will give you a much higher chance of good success, with your code.
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