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46 lines
811 B
Markdown
46 lines
811 B
Markdown
# Relation
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- Mysql
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- Postgres
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- Microsoft SQL Server
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- Oracle
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- Sqlite
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# NoSql
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- Monodb
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- Replica Set
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- Primary
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- Secondary
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- Hidden
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- Redis
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- Cluster
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- Strong recommend 3 masters and 3 slaves
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- Hbase
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- Cassendra
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# SQL
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- Index
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- Index is unique but not mandatory
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- join
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- MYSQL
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- tips
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- datetime
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- 8 bytes
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`1000-01-01 00:00:00 ~ 9999-12-31 23:59:59`
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- store a absolute value
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- timestamp
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- 4 bytes `1970-01-01 08:00:01 ~ 2038-01-19 11:14:07`
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- will impacted by time zone
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- index by timestamp will be faster than datetime due to 4 bytes.
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## SQL join diagram
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# Message Queue
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# Rabbitmq
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# activeMQ
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# Redis
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