Gue bersyukur karenanya.

Beberapa hari ini, gue dipusingkan karena “mainan” gue rusak seketika. Corrupt. Unrecoverable. Mainan yang membuat 60% itu mungkin, mainan yang membuat angka 4 diberikan, dan mainan yang mengizinkan gue untuk terus belajar.

Hanya karena kesalahan kecil tapi amat sangat fatal. Rookie-mistake, they called it. Musibah berawal dari komputer yang dimatikan secara bar-bar, tanpa mengikuti kaidah yang baik dan benar.

Sebuah mainan dengan kapasitas 19GB size of data, menguap begitu saja bagai embun pagi hari yang hilang perlahan disinaran mentari pagi *lebay*. Sebenarnya tidak benar-benar hilang juga siy, tapi seperti kotak harta karun yang lo ga bisa buka karena kuncinya rusak.

Sedari pagi hingga sore, gue berkutat dengan command-command yang gue sendiri ga ngerti. Gue dihadapkan oleh banyak error dengan kode ORA:-diikuti-nomor-nomor-aneh. Semua petunjuk dan ajian yang gue dapat dari Internet tidak bisa membantu gue, malah menenggelamkan gue lebih dalam. I’m so desperate. I would sell my soul to get it running. * No kidding *

Akhirnya gue nyerah dan mencoba bertanya ke milis, berharap di sore menjelang weekend masih ada yang terjaga dan memberikan petunjuk mengenai masalah yang sedang gue hadapi. Di saat gue tersesat ini, gue ga berharap banyak.

Ternyata ada yang mencoba membantu memberikan solusi. Seorang DBA Indonesia yang bekerja di Singapore merespon email gue dengan beberapa langkah. Dari petunjuk-petunjuk yang dia berikan lewat milis, masih belum bisa menyelesaikan masalah. Langkah yang dia berikan sudah bagus sekali -menunjukkan kapasitasnya sebagai DBA top-markotob- hanya saja masalah yang gue hadapi sudah sangat kompleks dan bisa dibilang, mustahil untuk diselamatkan.

Hingga malam, gue terus mencoba. Pak Endrue, yang tadi membalas di email bertanya lewat chat gmail, sampai dimana status DB-nya? Konstan, belum ada progress. Hingga dini hari, dia terus memonitoring dan memberi petunjuk. *Gila lu Ndro, jam 12 malam masih di kantor!* Esia pa bilang sampai jam 12 malam? sampai jam 1 gue cobain semua command, langkah, petunjuk, ajian yang diberikan pak Endrue. Tapi hasilnya nihil. Database tidak bisa sampai pada status open.

Gue nyerah (untuk sementara), sudah saatnya mengistirahatkan badan dan pikiran.

Saturday nite
Setelah work-hard *udah hard belum?* tapi belum ketemu solusinya, gue pengen play-hard. Tak disangka tak dinyana, kebetulan ada teman gue yang bisa dapetin free-pass masuk suatu club. Padahal, gue cuma mau nanyain harga, hahaha..Thanx Jul. Besoknya udah harus bangun lagi buat menghadiri pernikahan teman gue. Ada apa dengan bulan ini, apakah ini musim kawin? hehehe

It was Lucky
Gue udah ga ada minat buat nyelamatin datanya. Tapi pas gue ngecek ada beberapa reply-an di milis mengenai masalah gue, gue jadi penasaran lagi. Dengan beberapa command dan do’a, VOILA…database bisa open lagi. Up and Running smoothly. I’m so damn lucky.

Dan ini adalah hari yang indah. *Tersenyum lebar*

Terima kasih buat member indo-oracle yang sudah memberikan petunjuk-petunjuk yang bermanfaat.

Untuk masalah dan alternatif solusi berkaitan dengan apa yang gue alami, bisa langsung join di milis indo-oracle dan membaca pesan di sini *registered-member-required*.

This blog is too heavy to discuss about technical-kind-of-thing, but..if you have the same problem as I had. You already know who’s to call ;)

Hal pertama yang harus dilakukan adalah perencanaan. Proses instalasi Oracle terdiri dari 6 tahap, diantaranya: Membaca release note untuk memastikan sistem yang kita gunakan sesuai dengan versi Oracle yang kita install, Merencanakan proses instalasi, hal-hal berkenaan mengenai tahap pre-instalasi, Instalasi software, hal-hal berkenaan mengenai tahap post-instalasi, dan memulai bekerja di database baru.

Informasi mengenai teknis instalasi silahkan meluncur ke alamat ini. Maaf saya tidak menjelaskan detail di blog ini karena penjelasan di website tersebut lebih komprehensif. *ahlesyan*

Untuk demo instalasi, Saya sudah buatkan screencast-nya dan bisa di download di-sini:
http://www.sharekingdom.com/download/2493/screencast_oracle_installation.zip

Kenapa screencast? kalo a picture worth a thousand words, then a screencast worth a million pictures.

Berapa penduduk Bumi Indonesia? terakhir gue cek di buku SMU, jumlah penduduk Indonesia ‘tercatat’ sebanyak 220 juta jiwa.

Misalnya, semua data penduduk Indonesia kita simpan di sebuah databank yang kita namakan NKRI, dan databank tersebut terdiri dari beberapa tabel yang saling berhubungan. Data pribadi penduduk seperti nama, alamat, gender, pekerjaan, status, pendidikan atau tanggal lahir/usia disimpan dalam satu table yang kita namakan penduduks (sengaja dikasih ‘s’, biar sesuai konvensi..hehehe). Selain penduduks, juga ada tabel propinsis, kotas, perusahaans, ras…ok, cukup segitu dulu aja tabelnya.

Setelah semua table terisi data oleh data entry (Intermezzo: kalo ngisi sendiri, deadline 1 bulan tapi dibayar 10jt mau ga lo dpt kerjaan ini? wkwkwkw), ada request datang dari sok ahli kepresidenan. Beliau ingin tahu beberapa ringkasan penduduk Indonesia setiap bulan:

• Berapa penduduk Indonesia yang berada dibawah garis kemiskinan berdasarkan wilayah tempat tinggal dan gender di tiap kuartal?
• Berdasarkan propinsi, berapa jumlah pengangguran yang tingkat pendidikannya dibawah S1 dan berusia diantara 25-35 tahun
• Berapa gaji rata-rata penduduk berdasarkan wilayah, strata pekerjaan, tingkat pendidikan dan usia penduduk yang berada dalam 5 kota dengan pendapatan daerah terbanyak

Untuk mendapatkan data dengan kompleksitas query diatas akan membutuhkan banyak waktu, dan buat staf ahli yang sok sibuk, time is a luxury he doesn’t have. Sebenarnya dengan fungsi aggregate akan menjawab pertanyaan, tapi butuh waktu yang lama. Dengan asumsi teknologi yang digunakan adalah versi sederhana, tanpa grid-computing, cache yang disable-mode dan tanpa fitur times-ten Oracle. Hanya query dan table (maksa!)

Disinilah peranan Materialized View (MV). Kata kuncinya adalah: fungsi aggregate, query rutin, dan large massive data. MV adalah objek database yang berisi hasil dari data master table (table, view atau MV lain). Secara fisik, data hasil dari query disimpan dalam table tersendiri. Berbeda dengan view, yang hanya menampilkan hasil query.

Soal perbandingan performa? dijamin memuaskan, hehehe
Dengan query yang sama, perbandingan bisa dilihat dibawah:
Explain Plan dengan Materialized View

Explain Plan tanpa Materialized View

Dilihat dari berbagai sudut, terlihat jauh peningkatan performansi.

Kekurangan dari MV adalah data yang didapatkan tidak real-time, tergantung seberapa sering kita melakukan refresh terhadap MV(complete/incremental) dan akan menambah space data karena secara fisik, data tersimpan di table terpisah.

NB: Gue ga nulis cara untuk membuat dan menggunakan MV di blog ini, karena blog dan si empu ga kuat nerima hal-hal teknis di sini, hehehe…Google, anyone?

Referensi:

1. http://www.psoug.org/reference/materialized_views.html
2. Materialized View Concepts and Architecture
3. The Secrets of Materialized Views
4. The meaning of count, cpu and elapsed in tkprof
5. Query and current in tkprof
6. The meaning of count, cpu and elapsed in tkprof
7. Implementing materialized views in PostgreSQL
8. Implementing materialized views in MySQL
9. Implementing materialized views in Oracle – The Secrets of Materialized Views
10. Improving Performance with SQL Server 2005 Indexed Views

Humans have long been fascinated by ants, because these tiny insects are accomplished builders, nurses, miners, and even farmers. Fables such as “The Ant and the Grasshopper” extol the virtues of hardworking, forward-looking ants. (Hail ants!) It is true that individual ants are able to perform amazing feats: an ant can carry up to 50 times its body weight, can travel the human equivalent of 40 miles a day, and can climb vertical heights the equivalent of Mount Everest. However, the greatest accomplishments of ants are those performed together for the good of their community.

Queen ants establish new communities, or nests, after their mating flight. On this flight the queen mates with several males. After mating, the males fall to Earth and die. The queen then finds an uninhabited nest, settles into it, and pulls her wings off. She will never fly again, and after removing her wings she is able to absorb the wing muscles as nutrients for her eggs. She will continue to lay eggs, thousands of them, for years.

During the three-stage development process, which takes about two months, the eggs, larvae, and pupae are cared for by the nurse ants, who feed, clean, and carefully move the young to warmer or cooler places in the nest, depending on the temperature. These nurse ants are, in turn, cared for by other worker ants, who feed the nurses with regurgitated food. The workers and the nurses will fight together to defend the young against enemies if the nest is invaded, either by another group of ants or by a larger animal.

Taken from Colophon section in Oracle PL/SQL Programming 4th Ed By Steven Feuerstein, Bill Pribyl

Yahoo!

The word was invented by Jonathan Swift and used in his book Gulliver’s Travels. It represents a person who is repulsive in appearance and action and is barely human. Yahoo! founders Jerry Yang and David Filo selected the name because they considered themselves yahoos.
The name Yahoo! is an acronym for “Yet Another Hierarchical Officious Oracle,” but Filo and Yang insist they selected the name because they liked the general definition of a yahoo: “rude, unsophisticated, uncouth.” (Source: http://docs.yahoo.com/info/misc/history.html) – Thanks, Barry Ritholtz.

Xerox

The Greek root “xer” means dry. The inventor, Chestor Carlson, named his product Xerox as it was dry copying, markedly different from the then prevailing wet copying.

Sun Microsystems

Founded by four Stanford University buddies, Sun is the acronym for Stanford University Network.

Sony

From the Latin word ‘sonus’ meaning sound, and ‘sonny’ a slang used by Americans to refer to a bright youngster.

SAP

“Systems, Applications, Products in Data Processing”, formed by four ex-IBM employees who used to work in the ‘Systems/Applications/Projects’ group of IBM.

Red Hat

Larry Ellison and Bob Oats were working on a consulting project for the Central Intelligence Agency (CIA). The code name for the project was called Oracle (the CIA saw this as the system to give answers to all questions or something such).

Motorola

Founder Paul Galvin came up with this name when his company started manufacturing radios for cars. The popular radio company at the time was called Victrola.

Microsoft

It was coined by Bill Gates to represent the company that was devoted to MICROcomputer SOFTware. Originally christened Micro-Soft, the ‘-’ was removed later on.

Lotus

Mitch Kapor got the name for his company from the lotus position or ‘padmasana.’ Kapor used to be a teacher of Transcendental Meditation of Maharishi Mahesh Yogi.

Intel

Bob Noyce and Gordon Moore wanted to name their new company ‘Moore Noyce’ but that was already trademarked by a hotel chain, so they had to settle for an acronym of INTegrated ELectronics.

Hewlett-Packard

Bill Hewlett and Dave Packard tossed a coin to decide whether the company they founded would be called Hewlett-Packard or Packard-Hewlett.

Hotmail

Founder Jack Smith got the idea of accessing email via the web from a computer anywhere in the world. When Sabeer Bhatia came up with the business plan for the mail service, he tried all kinds of names ending in ‘mail’ and finally settled for Hotmail as it included the letters “html” – the programming language used to write web pages. It was initially referred to as HoTMaiL with selective upper casings.

Google

The name started as a jockey boast about the amount of information the search-engine would be able to search. It was originally named ‘Googol’, a word for the number represented by 1 followed by 100 zeros. After founders – Stanford graduate students Sergey Brin and Larry Page presented their project to an angel investor, they received a cheque made out to ‘Google

Cisco

The name is not an acronym but an abbreviation of San Francisco. The company’s logo reflects its San Francisco name heritage. It represents a stylized Golden Gate Bridge.

Apple Computers

Favourite fruit of founder Steve Jobs. He was three months late in filing a name for the business, and he threatened to call his company Apple Computers if the other colleagues didn’t suggest a better name by 5 o’clock

Apache

It got its name because its founders got started by applying patches to code written for NCSA’s httpd daemon. The result was ‘A PAtCHy’ server – thus, the name Apache.

Adobe

The name came from the river Adobe Creek that ran behind the house of founder John Warnock.