Re: [Boost-users] Backend of multi_index container

I have 7 fields in each record,two strings and five 64 bit integers. Of these,one of the integers is unique. I need to store all such records into the DB. In multi-index, I have a structure and this structure is being indexed by that integer value. If I have to similarly create a structure and store it as the value in LMDB, then what is its difference from multimap? I can do the same in multimap also. Then how does LMDB become a database. On Fri, Jun 24, 2016 at 7:43 PM, degski wrote:

On 24 June 2016 at 15:51, Anaswara Nair wrote:

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I have gone through LMDB. However AFAIK LMDB stores the data as a key-value pair.

Yes, it's a key-value store.

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Though duplicate keys are allowed, I couldn't find any relation between these entries. I couldn't understand its use as a database as well.

It's like std::(multi)map, maybe the wikipedia entry https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Database helps.

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Can you provide some help so that I can go deeper into this.

In your original question, you refer to having one unique ID and some related data per record. Maybe you could expand a bit on what you would like to achieve.

degski

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