.::: Quary query to simulation High CPU & High Memory Usage In EDB PostgreSQL :::.

 

 
A. Simulation High CPU

1. Contoh query untuk Simulasi CPU Tinggi
 
Untuk mensimulasikan CPU utilization tinggi di PostgreSQL menggunakan query, kamu bisa menjalankan perintah yang bersifat berat secara berulang, misalnya:

PERINGATAN!
Skrip di bawah akan membuat CPU usage PostgreSQL tinggi, gunakan di lingkungan development/test, bukan production.


CREATE OR REPLACE PROCEDURE cpu_hog()
LANGUAGE plpgsql
AS $$
DECLARE
    start_time timestamp := clock_timestamp();
    elapsed interval;
    i integer := 0;
    j double precision := 0;
BEGIN
    LOOP
        j := sqrt(i * random());
        i := i + 1;

        elapsed := clock_timestamp() - start_time;
        EXIT WHEN elapsed >= interval '20 seconds';
    END LOOP;
END;
$$;
 

.::: Shell Script Kasir cashier with & Without MariaDB :::.

 

A. Simple Cashier without Database

1. Struktur File listbarang.txt

2. Script: kasir.sh
 
[root@teguhth program]# cat kasir.sh

#!/bin/bash

file_barang="listbarang.txt"

# Fungsi untuk menampilkan daftar barang
tampilkan_barang() {
    echo -e "\nDaftar Barang:"
    echo "---------------------------"
    while IFS="|" read -r id nama harga
    do
        echo "$id. $nama - Rp$harga"
    done < "$file_barang"
    echo "---------------------------"
}

.::: Quary to simulation High CPU & High Memory Usage In MySQL MariaDB :::.

 

A. Simulation High CPU

1. Contoh untuk Simulasi CPU Tinggi
 
Untuk mensimulasikan CPU utilization tinggi di SQL Server menggunakan T-SQL, kamu bisa menjalankan perintah yang bersifat berat secara berulang, misalnya:

PERINGATAN!
Skrip di bawah akan membuat CPU usage SQL Server tinggi, gunakan di lingkungan development/test, bukan production.

USE teguhth;
DELIMITER $$

DROP PROCEDURE IF EXISTS CPU_HOG$$

CREATE PROCEDURE CPU_HOG()
BEGIN
    DECLARE i INT DEFAULT 0;
    DECLARE j DOUBLE DEFAULT 0;

    WHILE i < 10000000 DO
        SET j = SQRT(i * RAND());
        SET i = i + 1;
    END WHILE;
END$$

DELIMITER ;

.::: Quary T-SQL to simulation High CPU & High Memory Usage In SQL Server :::.

 

A. Simulation High CPU

1. Contoh T-SQL untuk Simulasi CPU Tinggi
 
Untuk mensimulasikan CPU utilization tinggi di SQL Server menggunakan T-SQL, kamu bisa menjalankan perintah yang bersifat berat secara berulang, misalnya:

PERINGATAN!
Skrip di bawah akan membuat CPU usage SQL Server tinggi, gunakan di lingkungan development/test, bukan production.

USE tempdb;
GO

IF OBJECT_ID('dbo.CPU_HOG') IS NOT NULL
    DROP PROCEDURE dbo.CPU_HOG;
GO

CREATE PROCEDURE dbo.CPU_HOG
AS
BEGIN
    DECLARE @i INT = 0;
    DECLARE @j FLOAT = 0;

    WHILE (@i < 10000000)
    BEGIN
        SET @j = SQRT(@i * RAND()); -- operasi matematika berat
        SET @i = @i + 1;
    END
END;
GO
 

.::: Insert data table to another table with different Database in Oracle Database :::.

 

A. Without Date

1. Check

select * from pembelian;
 

2. table after create
CREATE TABLE pembelian_clone (
    KODE_PEMBELIAN     CHAR(10) NOT NULL,
    KODE_BARANG        CHAR(6) NOT NULL,
    KODE_CUSTOMER      CHAR(6) NOT NULL,
    TANGGAL_PEMBELIAN  DATE DEFAULT NULL,
    JUMLAH_PEMBELIAN   DECIMAL(4,0) DEFAULT NULL
);
 

.::: Insert data table to another table with different Database in PostgreSQL EDB :::.

 

A. Without Date

1. Check

select * from pembelian;
 

2. table after create
CREATE TABLE pembelian_clone (
    KODE_PEMBELIAN     CHAR(10) NOT NULL,
    KODE_BARANG        CHAR(6) NOT NULL,
    KODE_CUSTOMER      CHAR(6) NOT NULL,
    TANGGAL_PEMBELIAN  DATE DEFAULT NULL,
    JUMLAH_PEMBELIAN   DECIMAL(4,0) DEFAULT NULL
);
 

.::: Insert data table to another table with different Database in MariaDB :::.

 

A. Without Date

1. Check

select * from teguhth.pembelian;
 
2. table after create
CREATE TABLE pembelian_clone (
    KODE_PEMBELIAN CHAR(10) NOT NULL,
    KODE_BARANG CHAR(6) NOT NULL,
    KODE_CUSTOMER CHAR(6) NOT NULL,
    TANGGAL_PEMBELIAN DATE DEFAULT NULL,
    JUMLAH_PEMBELIAN DECIMAL(4,0) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 

.::: Setting up and using the mutt email client in Linux for alert NMS or Other :::.

 

Berikut contoh penggunaan mutt untuk mengirim email dari command line di CentOS 9:

A. Setup

1. update repository

sudo dnf update -y

2. setup mutt

sudo dnf install mutt -y

3. check

mutt -v
 

.::: how to use DBMS_CRYPTO.ENCRYPT dan DBMS_CRYPTO.DECRYPT in Oracle as example table pembelian :::.

 

Oke! Saya akan kasih kamu contoh penggunaan DBMS_CRYPTO.ENCRYPT dan DBMS_CRYPTO.DECRYPT pada tabel pembelian. Di sini, kita akan menyimpan kolom credit_card_number dalam bentuk terenkripsi, dan mendekripsinya saat dibaca.

Studi Kasus: Tabel pembelian_card

1. grant access

GRANT EXECUTE ON DBMS_CRYPTO TO admin;
commit;

2. Buat tabel:

CREATE TABLE pembelian_card (
    id               NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    nama_pembeli     VARCHAR2(100),
    credit_card_enc  RAW(2000) -- data terenkripsi
);

.::: Backup restore Export import expdp impdp from schema to another schema in oracle using crontab :::.

 

correlation https://teguhth.blogspot.com/2024/12/backup-restore-export-import-expdb.html


1. backup manual

[oracle@teguhth ~]$ expdp aisyah/hanin@localhost:1521/tgh DIRECTORY=DATA_PUMP_DIR DUMPFILE=aisyah_schema.dmp LOGFILE=aisyah_schema.log SCHEMAS=aisyah

Export: Release 19.0.0.0.0 - Production on Tue Apr 22 14:10:38 2025
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "AISYAH"."SYS_EXPORT_SCHEMA_01":  aisyah/********@localhost:1521/tgh DIRECTORY=DATA_PUMP_DIR DUMPFILE=aisyah_schema.dmp LOGFILE=aisyah_schema.log SCHEMAS=aisyah
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type SCHEMA_EXPORT/STATISTICS/MARKER
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/TABLE/COMMENT
Processing object type SCHEMA_EXPORT/TABLE/IDENTITY_COLUMN
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/TRIGGER
. . exported "AISYAH"."BARANG"                           6.984 KB       6 rows
. . exported "AISYAH"."CUSTOMER"                         7.554 KB       6 rows
. . exported "AISYAH"."EMPLOYEES"                        6.359 KB       2 rows
. . exported "AISYAH"."EMPLOYEES_CHANGE_LOG"             8.312 KB       5 rows
. . exported "AISYAH"."PASOK"                            7.695 KB      12 rows
. . exported "AISYAH"."PEMBELIAN"                        7.835 KB      15 rows
. . exported "AISYAH"."SUPLIER"                          7.578 KB       6 rows
Master table "AISYAH"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for AISYAH.SYS_EXPORT_SCHEMA_01 is:
  /home/oracle/backup/aisyah_schema.dmp
Job "AISYAH"."SYS_EXPORT_SCHEMA_01" successfully completed at Tue Apr 22 14:11:39 2025 elapsed 0 00:00:58

[oracle@teguhth ~]$
 

.::: Enable Change Data Capture (CDC) Oracle Database using TRIGGER with session_user & client_ip :::.

 

Berikut adalah langkah-langkah untuk mengaktifkan Change Data Capture (CDC) di Oracle menggunakan Trigger, termasuk contoh tabel, isi tabel, dan implementasi trigger untuk melacak perubahan data:

1. Membuat Tabel Sumber
Tabel ini adalah tabel utama tempat data disimpan, dan perubahan pada tabel ini akan dilacak.

CREATE TABLE EMPLOYEES (
    EMP_ID NUMBER PRIMARY KEY,
    EMP_NAME VARCHAR2(50),
    DEPARTMENT_ID NUMBER,
    SALARY NUMBER
);
 

.::: How to enable CDC (Change Data Capture) in SQL Server Using Trigger with client_ip :::.

 

Berikut adalah implementasi Change Data Capture (CDC) menggunakan trigger di SQL Server, termasuk contoh tabel, data awal, serta operasi INSERT, UPDATE, dan DELETE.

correlation  with http://teguhth.blogspot.com/2022/11/how-to-enable-cdc-change-data-capture.html
https://teguhth.blogspot.com/2024/12/how-to-enable-cdc-change-data-capture.html
 
1. Membuat Tabel Utama
Misalkan tabel utama bernama Products:

CREATE TABLE Products (
    ProductID INT IDENTITY PRIMARY KEY,
    ProductName NVARCHAR(100),
    Price DECIMAL(10, 2),
    Stock INT
);

.::: Query Check user session, current, Client IP in MariaDB MySQL, PostgreSQL EDB, MSSQL SQL Server, Oracle :::.

 

1. MariaDB MySQL

select USER();
 

2. PostgreSQL

SELECT session_user, CURRENT_USER || '@' || host(inet_client_addr()) AS user_with_ip;  
SELECT CURRENT_USER || '@' || host(inet_client_addr()) AS user_with_ip;
SELECT COALESCE(host(inet_client_addr()), 'localhost') AS ip_only;
SELECT session_user,CURRENT_USER || '@' || inet_client_addr() AS user_with_ip;