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remove mentions of postgres from README
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# clio
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clio is an XRP Ledger API server. clio is optimized for RPC calls, over websocket or JSON-RPC. Validated
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historical ledger and transaction data is stored in a more space efficient format,
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using up to 4 times less space than rippled. clio can be configured to store data in Postgres, Cassandra or ScyllaDB,
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using up to 4 times less space than rippled. clio can be configured to store data in Apache Cassandra or ScyllaDB,
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allowing for scalable read throughput. Multiple clio nodes can share
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access to the same dataset, allowing for a highly available cluster of clio nodes,
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without the need for redundant data storage or computation.
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@@ -18,7 +18,7 @@ from which data can be extracted. The rippled node does not need to be running o
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## Requirements
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1. Access to a Postgres server, Cassandra cluster or ScyllaDB cluster. Can be local or remote.
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1. Access to a Cassandra cluster or ScyllaDB cluster. Can be local or remote.
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2. Access to one or more rippled nodes. Can be local or remote.
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@@ -109,7 +109,7 @@ is fully downloaded, clio only needs to extract the changed data for each ledger
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so extraction is much faster and clio can keep up with rippled in real time. Even under
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intense load, clio should not lag behind the network, as clio is not processing the data,
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and is simply writing to a database. The throughput of clio is dependent on the throughput
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of your database, but a standard Postgres, Cassandra or Scylla deployment can handle
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of your database, but a standard Cassandra or Scylla deployment can handle
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the write load of the XRP Ledger without any trouble. Generally the performance considerations
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come on the read side, and depends on the number of RPC requests your clio nodes
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are serving. Be aware that very heavy read traffic can impact write throughput. Again, this
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