How to specify OID as Date type in Sequoiadb
Today, I will talk to you about how to specify OID as Date type in Sequoiadb. Many people may not know much about it. In order to let you know more, Xiaobian summarizes the following contents for you. I hope you can gain something according to this article.
[Problem Description]
Specify OID type as Date. Will this cause duplicate oid values in scenarios with high concurrency? For example:
1. Create threads, insert OID of type Date into each thread:
BSONObject obj = new BasicBSONObject();
Date now = new Date();
obj.put("date", now);
2. Start multiple threads at the same time. Is oid repeated in case of multiple concurrent insertions?
[Solution]
1. OID is a 12-byte BSON data type. Generation rule: 4 bytes timestamp accurate to seconds
3 byte system (physical machine) identification
2 byte process ID
3 byte sequence number starting with a random number
2. From the above generation rules, OID is globally unique in a cluster environment
3. Java BSON OID generation rules are slightly different, Java OID 12 byte content consists of three parts:
4 byte timestamp accurate to the second
4 byte system (physical machine) identification
4 byte sequence number starting with a random number
4. Therefore, OIDs generated using java drivers are guaranteed to be unique within a group, not globally in a clustered environment
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