Kami menguji PostgreSQL pada SSD RAID-0 array dengan tabel 10 miliar entri. (Bagian 1)

Dr. Tariff (iOS, Android) .

HDD . , . SSD . SSD , RAID-0 . PostgreSQL SSD .

1. PostgreSQL SSD RAID-0 SSD.
2. (SELECT UPDATE) , , .

. :

1. SSD
2. RAID-0 2- SSD
4. SSD HDD

:

• Intel i7 4770.
• 16 Gb RAM.
• Intel SSD .
• Intel SSD 480 Gb 530 . Model – SSDSC2BW480A401
• Toshiba HDD 3000 Gb. Model – DT01ACA300
• – Ext4. SATA 3.

Linux Mint 17.2. PostgreSQL — «PostgreSQL 9.4.4 on x86_64-unknown-linux-gnu, compiled by gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, 64-bit»

SSD 440. SSD .



500 /, SATA .

Postgres :
shared_buffers = 2048 Mb
port = 5400
max_connections = 1000

3 :

• pg_bench
• Python Psycopg2
• Python SQLAlchemy

pgBench , . , . , , Python .

SQLAlchemy. SQL execute. , SQLAlchemy ( ) CPU.

Psycopg2 15%, , . Python c Psycopg2. Python .

:

CREATE TABLE numbers
(
"number" bigserial NOT NULL,
operator smallint,
region smallint,
CONSTRAINT numbers_pkey PRIMARY KEY (number)
)

:

'SELECT * FROM numbers WHERE number=%d'

.

:

'UPDATE numbers set region=%d, operator=%d WHERE number=%d'

. UPDATE , . INSERT DELETE . . , 1%.

RAID-0 mdadm. RAID , .

COPY. , . 1 1- .

SSD . – 1 . 42 21 . . , .

SELECT

. 16 , .

UPDATE

. 16 . – .

PostgreSQL MVCC ACID. , 2 .

dead-, . , .



15-20%. . VACUUM. , .

PostgreSQL .



, . . . , - .

, SSD 1- .
, 980 . , , .

SSD RAID-0 10- .

, Dr. Tariff Android iOS.


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