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Q: Writing a simple bank schema: How should I keep my balances in sync with their transaction history?
Apache Cassandra is a free and open-source, distributed, wide column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. Cassandra offers robust support for clusters spanning multiple datacenters, with asynchronous masterless replication allowing low latency operations for all clients.
== History ==
Avinash Lakshman, one of the authors of Amazon's Dynamo, and Prashant Malik initially developed Cassandra at Facebook to power the Facebook inbox search feature. Facebook released...
I have two tables having the following schema.
CREATE TABLE users(
`id` INT AUTO_INCREMENT,
`balance` DECIMAL(10, 2),
PRIMARY KEY(`id`)
);
CREATE TABLE user_transactions(
`id` INT AUTO_INCREMENT,
`user_id` INT,
`previous_balance` DECIMAL(10,2) COMMENT 'Balance before transaction',
...
I am trying to create a index organized table in oracle 11. I create the index organized table and insert the row from another table.
create table salIOT (
mypk ,
cid ,
date,
CONSTRAINT sal_pk PRIMARY KEY (mypk)
) ORGANIZATION INDEX
AS Select * from another table;
But the leaf blocks are emp...
In general, you want to utilize as much RAM as possible (leaving enough for the O/S, etc), since that means data is in-memory instead of being on disk.
For a CRM system serving 100 people, you may find 16GB of RAM dedicated to the server is not enough. My phone has 8GB of RAM, for instance, a...
