[root@vps training]# history | tail -20
1031 git pull
1032 php admin/cli/upgrade.php
1033 php admin/cli/maintenance.php –disable
1034 git branch -a
1035 git branch –track MOODLE_500_STABLE origin/MOODLE_500_STABLE
1036 git checkout MOODLE_500_STABLE
1037 git commit
1038 git checkout MOODLE_500_STABLE
1039 php admin/cli/maintenance.php –enable
1040 remotes/origin/MOODLE_400_STABLE
1041 git commit MOODLE_400_STABLE
1042 git branch –track MOODLE_400_STABLE origin/MOODLE_400_STABLE
1043 history -10
1044 history | tail -10
1045 git checkout MOODLE_400_STABLE
1046 php admin/cli/maintenance.php –enable
1047 git pull
1048 php admin/cli/upgrade.php
1049 php admin/cli/maintenance.php –disable
1050 history | tail -20
[root@vps training]# history | tail -25
1027 git pull
1028 php admin/cli/cron.php
1029 vi config.php
1030 php admin/cli/maintenance.php –enable
1031 git pull
1032 php admin/cli/upgrade.php
1033 php admin/cli/maintenance.php –disable
1034 git branch -a
1035 git branch –track MOODLE_500_STABLE origin/MOODLE_500_STABLE
1036 git checkout MOODLE_500_STABLE
1037 git commit
1038 git checkout MOODLE_500_STABLE
1039 php admin/cli/maintenance.php –enable
1040 remotes/origin/MOODLE_400_STABLE
1041 git commit MOODLE_400_STABLE
1042 git branch –track MOODLE_400_STABLE origin/MOODLE_400_STABLE
1043 history -10
1044 history | tail -10
1045 git checkout MOODLE_400_STABLE
1046 php admin/cli/maintenance.php –enable
1047 git pull
1048 php admin/cli/upgrade.php
1049 php admin/cli/maintenance.php –disable
1050 history | tail -20
1051 history | tail -25

• Stock Price Prediction

• Covid19 spread prediction

• Flu Spread Prediction

• Predict when inflation will be lower

• Healthcare which demographics are vulnerable for a specific disease

• Predict/forecast doctors need in 10 years

• Sales Forecast

• Fraud Detection

Try these Array Operations:

db.posts.find({}, {_id:0, category:1, tags:1});
db.posts.updateMany({category:'Event'}, {$addToSet:{tags:"Tech"}});
db.posts.updateMany({category:'Event'}, {$push:{tags:"Tech Event"}});
db.posts.updateMany({category:'Event'}, {$pull:{tags:"Tech"}});
db.posts.updateOne( { likes: 4 }, { $pop: { tags: -1 } } )
db.posts.updateMany({}, {$pull:{tags:["Tech"]}});
 db.posts.updateMany({}, {$pull:{tags:"Tech"}});
db.posts.updateMany({}, {$pull:{tags:{$in:["Tech", "Tech Event"]}}});
Run it several times: db.posts.updateMany({}, {$push:{tags:"Tech Event"}});
Check data: db.posts.find({}, {tags:1, _id:0});
Pull and then check data: 
db.posts.updateMany({}, {$pull:{tags:{$in:["Tech", "Tech Event"]}}});
db.posts.find({}, {tags:1, _id:0});

Use data from the URL below: https://www.w3schools.com/mongodb/mongodb_mongosh_insert.php

db.posts.insertMany([  
  {
    title: "Post Title 2",
    body: "Body of post.",
    category: "Event",
    likes: 2,
    tags: ["news", "events"],
    date: Date()
  },
  {
    title: "Post Title 3",
    body: "Body of post.",
    category: "Technology",
    likes: 3,
    tags: ["news", "events"],
    date: Date()
  },
  {
    title: "Post Title 4",
    body: "Body of post.",
    category: "Event",
    likes: 4,
    tags: ["news", "events"],
    date: Date()
  }
])

Theory/Concept:

^ : starts with

$ : Ends with

.* : any char, any number of times

/i : case insensitive

Try the following Queries

•db.posts.find( { title: { $regex: /4$/ } } );

•db.posts.find( { category: { $regex: /^T.*/ } } );

• db.posts.find( { category: { $not: /^p.*/ } } );

•db.posts.find( { category: { $regex: /^ev/i } } );

•db.posts.find( { category: { $regex: /^ev/ } } );

•db.posts.find( { category: { $regex: /^Ev/ } } );

•db.posts.find( { category: { $regex: /^Ev.*t$/ } } );

•db.posts.find( { category: { $regex: /^Ev*t$/ } } );

Use Data from the Following URL:

https://www.w3schools.com/mongodb/mongodb_mongosh_insert.php

db.posts.insertMany([  
  {
    title: "Post Title 2",
    body: "Body of post.",
    category: "Event",
    likes: 2,
    tags: ["news", "events"],
    date: Date()
  },
  {
    title: "Post Title 3",
    body: "Body of post.",
    category: "Technology",
    likes: 3,
    tags: ["news", "events"],
    date: Date()
  },
  {
    title: "Post Title 4",
    body: "Body of post.",
    category: "Event",
    likes: 4,
    tags: ["news", "events"],
    date: Date()
  }
])

To Know:

•WHAT IT IS?

•WHY WE NEED

•WHAT CAN WE AUDIT

•WHAT ORACLE AUDITS ON Its OWN

•WHERE AUDIT DATA ARE KEPT

•HOW TO SET CUSTOM AUDIT

•HOW TO SEE WHAT AUDITS ARE SET

•HOW TO SEE THE AUDIT TRAIL

Check:

https://docs.oracle.com/cd/E11882_01/server.112/e10575/tdpsg_auditing.htm#TDPSG50511

Activity: Using Audit Trail Views to Investigate Suspicious Activities

https://docs.oracle.com/cd/B19306_01/network.102/b14266/cfgaudit.htm#i1010026