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Evgeniy Khyst
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‎README.md

+3-3
Original file line numberDiff line numberDiff line change
@@ -890,9 +890,9 @@ The more indexes you have, the slower `INSERT` statements will become.
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Make sure you don't have an unused indexes.
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1. Reset statistics counters to zeros
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```sql
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SELECT pg_stat_reset();
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```
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```sql
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SELECT pg_stat_reset();
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```
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2. Let the system work for some time after resetting statistics.
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‎data.sql

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@@ -0,0 +1,62 @@
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INSERT INTO category (category_id, name)
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VALUES
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('940ff0d0-88b7-413e-ac43-8938bcdae665', 'Software Reuse'),
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('c5ccfb21-2f89-468a-aeac-645823f5fc42', 'Object-Oriented Software Design'),
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('d4747177-46f2-477a-b580-641890ae645b', 'Software Design & Engineering'),
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('963d44f4-ad3f-4086-9e05-83290242381b', 'Databases & Big Data');
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INSERT INTO author (author_id, full_name)
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VALUES
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('def8af9d-1191-4199-9600-fe3f7825a742', 'Erich Gamma'),
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('2e77d8a6-0c53-4d7c-ac4d-94877a8d9759', 'Richard Helm'),
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('3e031ea1-47bb-4d1d-9e11-b4692f26c80e', 'Ralph Johnson'),
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('c9700131-3740-4fb6-a9ab-d77abd4da907', 'John Vlissides'),
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('f3a82350-925b-4c84-803f-adf5ecb6de0d', 'Robert Martin'),
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('63c79713-2ba1-4006-9c37-6f54af18782d', 'Eric Evans'),
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('b7644e96-cc68-48a7-b6ce-67aa91b52bdf', 'Martin Fowler'),
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('a32b8ccc-38d7-4f2f-9014-1d593f507dc2', 'Gregor Hohpe'),
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('43b7a06e-1b32-4e0a-b536-348d73d76cd5', 'Bobby Woolf'),
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('ed0cb2b8-b4a8-4ae7-882e-2e75d7791ef7', 'Pramod Sadalage'),
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('08014407-cce6-417a-b3de-7252da4f3344', 'Martin Kleppmann');
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INSERT INTO publisher (publisher_id, name)
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VALUES
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('05a85ed5-e00d-49ad-a215-795dbfd87937', 'Addison-Wesley Professional'),
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('05f7bdc8-306c-4b9e-b37d-20593fcb70f5', 'Pearson'),
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('a080026e-51d8-4e88-ba05-063ce43a83af', 'O''Reilly Media');
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INSERT INTO book (book_id, isbn, title, publication_date, publisher_id, rating)
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VALUES
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', '978-0201633610', 'Design Patterns: Elements of Reusable Object-Oriented Software', '1994-11-10', '05a85ed5-e00d-49ad-a215-795dbfd87937', 4.7),
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('f00b659b-95e6-47f6-af5f-ec25c4e38631', '978-0135974445', 'Agile Software Development, Principles, Patterns, and Practices', '2002-10-15', '05f7bdc8-306c-4b9e-b37d-20593fcb70f5', 4.6),
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('58b46e28-ec87-4776-b46d-180046780132', '978-0321125217', 'Domain-Driven Design: Tackling Complexity in the Heart of Software', '2003-08-20', '05a85ed5-e00d-49ad-a215-795dbfd87937', 4.5),
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('54c8cf28-e071-47ed-97e5-2002512509ea', '978-0321127426', 'Patterns of Enterprise Application Architecture', '2002-11-05', '05a85ed5-e00d-49ad-a215-795dbfd87937', 4.5),
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('aa8811c4-7f06-44f9-b934-a648d4d908c6', '978-0321200686', 'Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions', '2003-08-10', '05a85ed5-e00d-49ad-a215-795dbfd87937', 4.7),
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('f8a7f930-5b23-480b-bfea-7f77c5cb2db9', '978-0321826626', 'NoSQL Distilled: A Brief Guide to the Emerging World of Polyglot Persistence', '2012-08-08', '05a85ed5-e00d-49ad-a215-795dbfd87937', 4.4),
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('aa327ea7-58ee-42dc-8c49-83f68bc50da7', '978-1449373320', 'Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems', '2017-04-18', 'a080026e-51d8-4e88-ba05-063ce43a83af', 4.8);
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INSERT INTO book_category (book_id, category_id)
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VALUES
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', '940ff0d0-88b7-413e-ac43-8938bcdae665'),
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', 'c5ccfb21-2f89-468a-aeac-645823f5fc42'),
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('f00b659b-95e6-47f6-af5f-ec25c4e38631', 'c5ccfb21-2f89-468a-aeac-645823f5fc42'),
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('58b46e28-ec87-4776-b46d-180046780132', 'c5ccfb21-2f89-468a-aeac-645823f5fc42'),
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('54c8cf28-e071-47ed-97e5-2002512509ea', 'c5ccfb21-2f89-468a-aeac-645823f5fc42'),
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('aa8811c4-7f06-44f9-b934-a648d4d908c6', 'c5ccfb21-2f89-468a-aeac-645823f5fc42'),
46+
('f8a7f930-5b23-480b-bfea-7f77c5cb2db9', '963d44f4-ad3f-4086-9e05-83290242381b'),
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('aa327ea7-58ee-42dc-8c49-83f68bc50da7', 'd4747177-46f2-477a-b580-641890ae645b');
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INSERT INTO book_author (book_id, author_id)
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VALUES
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', 'def8af9d-1191-4199-9600-fe3f7825a742'),
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', '2e77d8a6-0c53-4d7c-ac4d-94877a8d9759'),
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', '3e031ea1-47bb-4d1d-9e11-b4692f26c80e'),
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('9a58f19c-bf6a-4cd0-be4a-33fa33264473', 'c9700131-3740-4fb6-a9ab-d77abd4da907'),
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('f00b659b-95e6-47f6-af5f-ec25c4e38631', 'f3a82350-925b-4c84-803f-adf5ecb6de0d'),
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('58b46e28-ec87-4776-b46d-180046780132', '63c79713-2ba1-4006-9c37-6f54af18782d'),
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('54c8cf28-e071-47ed-97e5-2002512509ea', 'b7644e96-cc68-48a7-b6ce-67aa91b52bdf'),
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('aa8811c4-7f06-44f9-b934-a648d4d908c6', 'a32b8ccc-38d7-4f2f-9014-1d593f507dc2'),
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('aa8811c4-7f06-44f9-b934-a648d4d908c6', '43b7a06e-1b32-4e0a-b536-348d73d76cd5'),
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('f8a7f930-5b23-480b-bfea-7f77c5cb2db9', 'b7644e96-cc68-48a7-b6ce-67aa91b52bdf'),
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('f8a7f930-5b23-480b-bfea-7f77c5cb2db9', 'ed0cb2b8-b4a8-4ae7-882e-2e75d7791ef7'),
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('aa327ea7-58ee-42dc-8c49-83f68bc50da7', '08014407-cce6-417a-b3de-7252da4f3344');

‎docker-compose.yml

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version: '3.1'
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services:
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fasttablespace:
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image: busybox
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restart: "no"
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command: >
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sh -c "mkdir -p /ssd1/postgresql/data/fasttablespace
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&& chown -R 999:999 /ssd1/postgresql/data/fasttablespace"
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volumes:
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- fasttablespace:/ssd1/postgresql/data
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postgres:
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image: postgres:13
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restart: always
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environment:
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POSTGRES_DB: postgres
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POSTGRES_USER: admin
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POSTGRES_PASSWORD: s3cr3t
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command:
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- "postgres"
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- "-c"
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- "shared_preload_libraries=pg_stat_statements"
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volumes:
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- pgdata:/var/lib/postgresql/data
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- ./docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d
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- fasttablespace:/ssd1/postgresql/data
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depends_on:
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- fasttablespace
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pgadmin:
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image: dpage/pgadmin4
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restart: always
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environment:
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PGADMIN_DEFAULT_EMAIL: [email protected]
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PGADMIN_DEFAULT_PASSWORD: s3cr3t
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volumes:
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- pgadmin-data:/var/lib/pgadmin
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- ./pgadmin4/servers.json:/pgadmin4/servers.json
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ports:
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- 8080:80
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depends_on:
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- postgres
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volumes:
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pgdata:
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driver: local
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pgadmin-data:
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driver: local
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fasttablespace:
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driver: local

‎drop-all.sql

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DROP TABLE book_category,
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book_author,
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book,
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publisher,
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author,
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category;

‎img/tables.png

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‎img/tables.puml

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@startuml
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hide circle
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skinparam linetype ortho
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entity "CATEGORY" as c {
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*CATEGORY_ID : UUID <<PK1>>
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--
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*NAME : VARCHAR(255) <<U1,NN>>
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}
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entity "AUTHOR" as a {
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*AUTHOR_ID : UUID <<PK1>>
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--
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*FULL_NAME : VARCHAR(255) <<U1,NN>>
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}
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entity "PUBLISHER" as p {
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*PUBLISHER_ID : UUID <<PK1>>
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--
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*NAME : VARCHAR(255) <<U1,NN>>
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}
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entity "BOOK" as b {
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*BOOK_ID : UUID <<PK1>>
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--
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*ISBN : VARCHAR(14) <<U1>>
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*TITLE : VARCHAR(255) <<NN>>
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*PUBLICATION_DATE : DATE <<NN>>
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*PUBLISHER_ID : UUID <<FK>>
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*RATING : NUMERIC(4, 3)
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}
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entity "BOOK_CATEGORY" as bc {
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*BOOK_ID : UUID <<PK1,FK>>
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*CATEGORY_ID : UUID <<PK1,FK>>
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--
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}
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entity "BOOK_AUTHOR" as ba {
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*BOOK_ID : UUID <<PK1,FK>>
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*AUTHOR_ID : UUID <<PK1,FK>>
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--
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}
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b ||..|{ bc
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b ||..|{ ba
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b ||..|{ p
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c ||..|{ bc
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a ||..|{ ba
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@enduml

‎pgadmin4/servers.json

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{
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"Servers": {
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"1": {
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"Name": "Local PostgreSQL",
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"Group": "Servers",
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"Host": "postgres",
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"Port": 5432,
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"SSLMode": "prefer",
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"MaintenanceDB": "postgres",
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"Username": "admin"
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}
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}
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}

‎schema.sql

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CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
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CREATE TABLE category (
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category_id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
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name VARCHAR(255) UNIQUE NOT NULL
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);
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CREATE TABLE author (
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author_id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
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full_name VARCHAR(255) UNIQUE NOT NULL
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);
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CREATE TABLE publisher (
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publisher_id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
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name VARCHAR(255) UNIQUE NOT NULL
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);
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CREATE TABLE book (
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book_id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
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isbn VARCHAR(14) UNIQUE,
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title VARCHAR(255) NOT NULL,
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publication_date DATE NOT NULL,
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publisher_id UUID REFERENCES publisher(publisher_id),
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rating NUMERIC(4, 3)
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);
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CREATE TABLE book_category (
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book_id UUID REFERENCES book(book_id),
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category_id UUID REFERENCES category(category_id),
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PRIMARY KEY (book_id, category_id)
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);
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CREATE TABLE book_author (
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book_id UUID REFERENCES book(book_id),
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author_id UUID REFERENCES author(author_id),
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PRIMARY KEY (book_id, author_id)
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);

‎toc.js

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// node toc.js README.md
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const filename = process.argv[2];
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if (!filename) {
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throw 'Filename is not specified';
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}
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const fs = require('fs');
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const os = require('os');
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const crypto = require('crypto');
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function insert(str, start, delCount, newSubStr) {
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return str.slice(0, start) + newSubStr + str.slice(start + delCount);
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};
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let data = fs.readFileSync(filename, 'utf8');
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const matches = data.matchAll(/(#{2,6})(\s+)(<a name=".+"><\/a>)?(.+)(\r?\n)?/g);
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const toc = [];
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for (const match of Array.from(matches).reverse()) {
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const level = match[1];
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const spaces = match[2];
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const anchor = match[3];
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const title = match[4];
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const hash = crypto.createHash('md5').update(title).digest('hex');
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data = insert(data, match.index + level.length + spaces.length, anchor ? anchor.length : 0, `<a name="${hash}"></a>`);
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toc.unshift(`${' '.repeat(level.length - 2)}* [${title}](#${hash})`);
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}
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const lines = data.split(/\r?\n/);
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let matched = false;
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let tocStart = -1;
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let tocEnd = -1;
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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if (line.match(/^\s*\*\s+\[.+\]\(#\w+\)$/)) {
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if (!matched) {
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tocStart = i;
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}
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matched = true;
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} else {
43+
if (matched) {
44+
if (line.match(/^\s*$/)) {
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tocEnd = i + 1;
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} else {
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tocEnd = i;
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}
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break;
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}
51+
}
52+
i++;
53+
}
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lines.splice(tocStart, tocEnd - tocStart);
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data = '';
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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data += line + os.EOL;
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}
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const match = /#\s+.+(\r?\n)/.exec(data);
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data = insert(data, match.index + match[0].length, 0, os.EOL + toc.join(os.EOL) + os.EOL);
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fs.writeFileSync(filename, data, 'utf8');

‎truncate.sql

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TRUNCATE book_category,
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book_author,
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category,
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author,
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publisher,
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book;

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