schemaless

What’s the attraction of schemaless database systems?

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I’ll just call out one or two common reasons (I’m sure people will be writing essay answers) With highly distributed systems, any given data set may be spread across multiple servers. When that happens, the relational constraints which the DB engine can guarantee are greatly reduced. Some of your referential integrity will need to be … Read more

How to export collection to CSV in MongoDB?

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@karoly-horvath has it right. Fields are required for csv. According to this bug in the MongoDB issue tracker https://jira.mongodb.org/browse/SERVER-4224 you MUST provide the fields when exporting to a csv. The docs are not clear on it. That is the reason for the error. Try this: mongoexport –host localhost –db dbname –collection name –csv –out text.csv … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)