{"id":5465,"date":"2026-06-15T14:01:13","date_gmt":"2026-06-15T14:01:13","guid":{"rendered":"https:\/\/cloudsave.app\/?p=5465"},"modified":"2026-06-15T15:44:47","modified_gmt":"2026-06-15T15:44:47","slug":"vm-snapshotlar%c4%b1-niy%c9%99-tranzaksiya-m%c9%99lumat-bazalar%c4%b1-%c3%bc%c3%a7%c3%bcn-t%c9%99hl%c3%bck%c9%99siz-deyil-m%c9%99lumat-b%c3%bct%c3%b6vl%c3%bcy%c3%bc-%c3%bc%c3%a7%c3%bcn-dba-b%c9%99l","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/az\/knowledge-base\/vm-snapshotlar%c4%b1-niy%c9%99-tranzaksiya-m%c9%99lumat-bazalar%c4%b1-%c3%bc%c3%a7%c3%bcn-t%c9%99hl%c3%bck%c9%99siz-deyil-m%c9%99lumat-b%c3%bct%c3%b6vl%c3%bcy%c3%bc-%c3%bc%c3%a7%c3%bcn-dba-b%c9%99l\/","title":{"rendered":"VM Snapshotlar\u0131 Niy\u0259 Tranzaksiya M\u0259lumat Bazalar\u0131 \u00fc\u00e7\u00fcn T\u0259hl\u00fck\u0259siz Deyil: M\u0259lumat B\u00fct\u00f6vl\u00fcy\u00fc \u00fc\u00e7\u00fcn DBA B\u0259l\u0259d\u00e7isi"},"content":{"rendered":"<p>DevOps m\u00fch\u0259ndisl\u0259ri v\u0259 sistem administratorlar\u0131 \u00fc\u00e7\u00fcn virtual ma\u015f\u0131n (VM) snapshotlar\u0131 t\u0259m\u0259l bir vasit\u0259dir. Onlar riskli bir yamaq (patch), \u0259sas konfiqurasiya d\u0259yi\u015fikliyi v\u0259 ya t\u0259tbiq yerl\u0259\u015fdirilm\u0259sind\u0259n \u0259vv\u0259l serverin v\u0259ziyy\u0259tini \u0259l\u0259 ke\u00e7irm\u0259k \u00fc\u00e7\u00fcn s\u00fcr\u0259tli v\u0259 rahat bir yol t\u0259qdim edir. \u018fg\u0259r n\u0259s\u0259 s\u0259hv ged\u0259rs\u0259, geri qay\u0131tmaq (roll back) saniy\u0259l\u0259r \u00e7\u0259kir.<\/p>\n<p>Lakin, eyni metodologiya PostgreSQL, MySQL, Oracle v\u0259 ya Microsoft SQL Server kimi tranzaksiya bazalar\u0131na t\u0259tbiq edildikd\u0259, VM snapshotlar\u0131 t\u0259hl\u00fck\u0259sizlik torundan \u00e7\u0131x\u0131b i\u015fl\u0259y\u0259n bir saatl\u0131 bombaya \u00e7evrilir.<\/p>\n<p>M\u0259lumat bazas\u0131 ehtiyat n\u00fcsx\u0259l\u0259ri \u00fc\u00e7\u00fcn standart hipervizor snapshotlar\u0131na g\u00fcv\u0259nm\u0259k m\u0259lumatlar\u0131n korlanmas\u0131, &#8220;c\u0131r\u0131lm\u0131\u015f s\u0259hif\u0259l\u0259r&#8221; (torn pages) v\u0259 b\u0259rpa olunmayan istehsal dayanmalar\u0131n\u0131n \u0259n \u00e7ox yay\u0131lm\u0131\u015f s\u0259b\u0259bl\u0259rind\u0259n biridir. Bu m\u0259qal\u0259d\u0259 biz hipervizorlar v\u0259 m\u0259lumat bazas\u0131 m\u00fch\u0259rrikl\u0259ri aras\u0131ndak\u0131 memarl\u0131q toqqu\u015fmas\u0131n\u0131, snapshotlar zaman\u0131 m\u0259lumatlar\u0131n korlanmas\u0131 mexanizml\u0259rini v\u0259 virtualizasiya edilmi\u015f m\u0259lumat bazalar\u0131n\u0131 t\u0259hl\u00fck\u0259siz \u015f\u0259kild\u0259 ehtiyat n\u00fcsx\u0259l\u0259m\u0259k \u00fc\u00e7\u00fcn t\u0259l\u0259b olunan m\u00fch\u0259ndislik \u0259n yax\u015f\u0131 t\u0259cr\u00fcb\u0259l\u0259rini ara\u015fd\u0131raca\u011f\u0131q.<\/p>\n<h2>Memarl\u0131q Toqqu\u015fmas\u0131: Hipervizorlar vs. M\u0259lumat Bazas\u0131 M\u00fch\u0259rrikl\u0259ri<\/h2>\n<p>VM snapshotlar\u0131n\u0131n m\u0259lumat bazalar\u0131n\u0131 niy\u0259 t\u0259hl\u00fck\u0259y\u0259 atd\u0131\u011f\u0131n\u0131 ba\u015fa d\u00fc\u015fm\u0259k \u00fc\u00e7\u00fcn \u0259vv\u0259lc\u0259 h\u0259r iki sistemin v\u0259ziyy\u0259ti v\u0259 I\/O \u0259m\u0259liyyatlar\u0131n\u0131 nec\u0259 idar\u0259 etdiyini ara\u015fd\u0131rmal\u0131y\u0131q.<\/p>\n<h3>Hipervizorlar Snapshotlar\u0131 Nec\u0259 \u0130cra Edir<\/h3>\n<p>Hipervizor (m\u0259s\u0259l\u0259n, VMware ESXi, Microsoft Hyper-V v\u0259 ya KVM) snapshot g\u00f6t\u00fcrd\u00fckd\u0259, diski kopyalam\u0131r. Bunun \u0259v\u0259zin\u0259, cari virtual disk fayl\u0131n\u0131 (m\u0259s\u0259l\u0259n, <code>.vmdk<\/code> v\u0259 ya <code>.vhdx<\/code>) yaln\u0131z oxuna bil\u0259n v\u0259ziyy\u0259t\u0259 dondurur v\u0259 yeni bir delta disk (f\u0259rql\u0259ndirici disk) yarad\u0131r. Sonrak\u0131 b\u00fct\u00fcn yazmalar bu delta disk\u0259 y\u00f6n\u0259ldilir.<\/p>\n<p>Snapshot silindikd\u0259, hipervizor delta diskd\u0259ki m\u0259lumatlar\u0131 \u0259sas disk\u0259 k\u00f6\u00e7\u00fcrm\u0259li (birl\u0259\u015fdirm\u0259li) olur. Standart snapshotlar qonaq \u0259m\u0259liyyat sistemind\u0259 i\u015fl\u0259y\u0259n t\u0259tbiql\u0259rd\u0259n tamamil\u0259 x\u0259b\u0259rsizdir. Onlar disk v\u0259ziyy\u0259tini tam olaraq o mikrosaniy\u0259d\u0259 m\u00f6vcud oldu\u011fu kimi \u0259l\u0259 ke\u00e7irirl\u0259r.<\/p>\n<h3>Tranzaksiya M\u0259lumat Bazalar\u0131 V\u0259ziyy\u0259ti Nec\u0259 \u0130dar\u0259 Edir<\/h3>\n<p>Tranzaksiya m\u0259lumat bazalar\u0131 ACID x\u00fcsusiyy\u0259tl\u0259ri (Atomiklik, Ard\u0131c\u0131ll\u0131q, \u0130zolyasiya, Davaml\u0131l\u0131q) \u0259traf\u0131nda dizayn edilmi\u015fdir. ACID uy\u011funlu\u011funu qoruyark\u0259n y\u00fcks\u0259k performansa nail olmaq \u00fc\u00e7\u00fcn m\u0259lumat bazalar\u0131 h\u0259r tranzaksiyan\u0131 d\u0259rhal diskd\u0259ki \u0259sas m\u0259lumat fayllar\u0131na yazm\u0131r. Bunun \u0259v\u0259zin\u0259, onlar m\u00fcr\u0259kk\u0259b, \u00e7ox s\u0259viyy\u0259li bir memarl\u0131qdan istifad\u0259 edirl\u0259r:<\/p>\n<ol>\n<li><strong>Buffer Pool \/ Shared Buffers:<\/strong> M\u0259lumatlar oxunur v\u0259 sistem yadda\u015f\u0131nda d\u0259yi\u015fdirilir.<\/li>\n<li><strong>Write-Ahead Log (WAL) \/ Redo Logs:<\/strong> D\u0259yi\u015fiklikl\u0259r davaml\u0131l\u0131\u011f\u0131 t\u0259min etm\u0259k \u00fc\u00e7\u00fcn diskd\u0259ki y\u00fcks\u0259k optimalla\u015fd\u0131r\u0131lm\u0131\u015f loq fayl\u0131na ard\u0131c\u0131l olaraq yaz\u0131l\u0131r.<\/li>\n<li><strong>Checkpoints \/ Lazy Writers:<\/strong> M\u0259lumat bazas\u0131 vaxta\u015f\u0131r\u0131 olaraq d\u0259yi\u015fdirilmi\u015f (\u00e7irkli) s\u0259hif\u0259l\u0259ri yadda\u015fdan diskd\u0259ki faktiki m\u0259lumat fayllar\u0131na k\u00f6\u00e7\u00fcr\u00fcr.<\/li>\n<\/ol>\n<p>Bu memarl\u0131\u011fa g\u00f6r\u0259, diskd\u0259ki fiziki m\u0259lumat fayllar\u0131 dem\u0259k olar ki, h\u0259mi\u015f\u0259 m\u0259lumat bazas\u0131n\u0131n faktiki v\u0259ziyy\u0259ti il\u0259 sinxronizasiyadan k\u0259narda olur. M\u0259lumat bazas\u0131n\u0131n \u0259sl v\u0259ziyy\u0259ti yaln\u0131z diskd\u0259ki m\u0259lumat fayllar\u0131, WAL\/Redo loqlar\u0131 v\u0259 haz\u0131rda yadda\u015fda olan m\u0259lumatlar\u0131n birl\u0259\u015fm\u0259si kimi m\u00f6vcuddur.<\/p>\n<h2>T\u0259hl\u00fck\u0259 Zonas\u0131: VM Snapshotu Zaman\u0131 N\u0259 Ba\u015f Verir<\/h2>\n<p>M\u0259lumat bazas\u0131 serverinin standart VM snapshotunu g\u00f6t\u00fcrd\u00fckd\u0259, siz <strong>q\u0259za-ard\u0131c\u0131l (crash-consistent)<\/strong> bir v\u0259ziyy\u0259ti \u0259l\u0259 ke\u00e7irirsiniz.<\/p>\n<h3>Q\u0259za Ard\u0131c\u0131ll\u0131\u011f\u0131 vs. T\u0259tbiq Ard\u0131c\u0131ll\u0131\u011f\u0131<\/h3>\n<p>Q\u0259za-ard\u0131c\u0131l snapshot, fiziki serverin elektrik kabelini \u00e7\u0131xarma\u011fa b\u0259rab\u0259rdir. Disk v\u0259ziyy\u0259ti \u0259l\u0259 ke\u00e7irilir, lakin yadda\u015fda olan h\u0259r \u015fey itirilir v\u0259 saxlama n\u0259zar\u0259t\u00e7isin\u0259 (storage controller) ged\u0259n h\u0259r \u015fey q\u0259fil k\u0259silir.<\/p>\n<p>M\u00fcasir m\u0259lumat bazalar\u0131 g\u00f6zl\u0259nilm\u0259z elektrik k\u0259silm\u0259sind\u0259n sonra Write-Ahead Log-u yenid\u0259n oynadaraq b\u0259rpa olunmaq \u00fc\u00e7\u00fcn dizayn edils\u0259 d\u0259, q\u0259za b\u0259rpas\u0131na \u0259sas ehtiyat n\u00fcsx\u0259 strategiyan\u0131z kimi g\u00fcv\u0259nm\u0259k \u00e7ox t\u0259hl\u00fck\u0259lidir. \u018fg\u0259r m\u0259lumat bazan\u0131z bir ne\u00e7\u0259 virtual disk\u0259 yay\u0131l\u0131bsa (m\u0259s\u0259l\u0259n, m\u0259lumat fayllar\u0131 <code>Drive D:<\/code>-d\u0259 v\u0259 WAL <code>Drive E:<\/code>-d\u0259), hipervizor h\u0259r iki diski eyni mikrosaniy\u0259d\u0259 snapshot etm\u0259y\u0259 bil\u0259r. \u018fg\u0259r WAL diski snapshotu m\u0259lumat diski snapshotundan bir saniy\u0259nin fraksiyas\u0131 q\u0259d\u0259r gec \u00e7\u0259kil\u0259rs\u0259, m\u0259lumat bazas\u0131 b\u0259rpa zaman\u0131 ard\u0131c\u0131ll\u0131q n\u00f6mr\u0259l\u0259rini uzla\u015fd\u0131ra bilm\u0259z v\u0259 bu, \u00f6l\u00fcmc\u00fcl korlanmaya s\u0259b\u0259b olur.<\/p>\n<h3>Y\u00fcks\u0259k Tranzaksiyal\u0131 Sisteml\u0259rd\u0259 &#8220;VM Stun&#8221; Effekti<\/h3>\n<p>Snapshot yaratma prosesi v\u0259 daha da \u0259h\u0259miyy\u0259tlisi, snapshotun birl\u0259\u015fdirilm\u0259si prosesi &#8220;VM Stun&#8221; kimi tan\u0131nan bir fenomene s\u0259b\u0259b olur.<\/p>\n<p>I\/O-nu \u0259sas diskd\u0259n delta disk\u0259 t\u0259hl\u00fck\u0259siz \u015f\u0259kild\u0259 ke\u00e7irm\u0259k \u00fc\u00e7\u00fcn hipervizor virtual ma\u015f\u0131n\u0131 q\u0131sa m\u00fcdd\u0259t\u0259 dayand\u0131rmal\u0131d\u0131r (stun). Y\u00fcng\u00fcl y\u00fckl\u0259nmi\u015f veb server \u00fc\u00e7\u00fcn bu dayanma 10-50 millisaniy\u0259 \u00e7\u0259k\u0259 bil\u0259r v\u0259 n\u0259z\u0259r\u0259 \u00e7arpmaya bil\u0259r. Lakin, k\u00fctl\u0259vi I\/O-ya malik y\u00fcks\u0259k \u00f6t\u00fcr\u00fcc\u00fcl\u00fc m\u0259lumat bazas\u0131 \u00fc\u00e7\u00fcn b\u00f6y\u00fck bir delta diski birl\u0259\u015fdirm\u0259k VM-i bir ne\u00e7\u0259 saniy\u0259 \u0259rzind\u0259 dondura bil\u0259r.<\/p>\n<p>VM dayanmas\u0131 zaman\u0131:<br \/>\n* \u015e\u0259b\u0259k\u0259 ba\u011flant\u0131lar\u0131 k\u0259silir, bu da t\u0259tbiq vaxt a\u015f\u0131m\u0131na (timeout) s\u0259b\u0259b olur.<br \/>\n* Y\u00fcks\u0259k \u0259l\u00e7atanl\u0131q klasterl\u0259ri (SQL Server Always On, PostgreSQL Patroni v\u0259 ya MySQL Galera kimi) \u00fcr\u0259k d\u00f6y\u00fcnt\u00fcs\u00fc (heartbeat) yoxlamalar\u0131n\u0131 qa\u00e7\u0131r\u0131r.<br \/>\n* Klaster dondurulmu\u015f qov\u015fa\u011f\u0131n \u00f6ld\u00fcy\u00fcn\u00fc g\u00fcman ed\u0259r\u0259k laz\u0131ms\u0131z v\u0259 da\u011f\u0131d\u0131c\u0131 bir failover (split-brain ssenarisi) ba\u015flad\u0131r.<\/p>\n<h3>C\u0131r\u0131lm\u0131\u015f S\u0259hif\u0259l\u0259r (Torn Pages) v\u0259 I\/O Uy\u011funsuzlu\u011fu<\/h3>\n<p>M\u0259lumat bazas\u0131 m\u00fch\u0259rrikl\u0259ri ad\u0259t\u0259n m\u0259lumatlar\u0131 x\u00fcsusi s\u0259hif\u0259 \u00f6l\u00e7\u00fcl\u0259rind\u0259 (m\u0259s\u0259l\u0259n, PostgreSQL v\u0259 SQL Server \u00fc\u00e7\u00fcn 8KB, InnoDB \u00fc\u00e7\u00fcn 16KB) yaz\u0131r. Lakin, \u0259sas \u0259m\u0259liyyat sistemi v\u0259 saxlama massivl\u0259ri I\/O-nu daha ki\u00e7ik bloklarla (m\u0259s\u0259l\u0259n, 4KB v\u0259 ya 512 bayt) emal edir.<\/p>\n<p>\u018fg\u0259r hipervizor m\u0259lumat bazas\u0131 8KB-l\u0131q bir s\u0259hif\u0259ni yazark\u0259n snapshot g\u00f6t\u00fcr\u0259rs\u0259, snapshot yeni m\u0259lumat\u0131n ilk 4KB-n\u0131 v\u0259 k\u00f6hn\u0259 m\u0259lumat\u0131n son 4KB-n\u0131 \u0259l\u0259 ke\u00e7ir\u0259 bil\u0259r. Bu, <strong>c\u0131r\u0131lm\u0131\u015f s\u0259hif\u0259<\/strong> yarad\u0131r. Snapshotu b\u0259rpa etm\u0259y\u0259 \u00e7al\u0131\u015fd\u0131qda, m\u0259lumat bazas\u0131 s\u0259hif\u0259ni oxuyacaq, checksum yoxlamas\u0131ndan ke\u00e7\u0259 bilm\u0259y\u0259c\u0259k v\u0259 m\u0259lumat bazas\u0131n\u0131 korlanm\u0131\u015f kimi i\u015far\u0259l\u0259y\u0259c\u0259k.<\/p>\n<h2>X\u00fcsusi M\u0259lumat Bazas\u0131 M\u00fch\u0259rrikl\u0259ri \u00fc\u00e7\u00fcn Real D\u00fcnya N\u0259tic\u0259l\u0259ri<\/h2>\n<p>M\u00fcxt\u0259lif m\u0259lumat bazas\u0131 m\u00fch\u0259rrikl\u0259ri q\u0259za-ard\u0131c\u0131l snapshotlara m\u00fcxt\u0259lif yollarla reaksiya verir, lakin he\u00e7 biri istehsal m\u00fchitind\u0259 bunu d\u00fczg\u00fcn idar\u0259 etmir.<\/p>\n<ul>\n<li><strong>PostgreSQL:<\/strong> PostgreSQL <code>pg_wal<\/code> kataloquna \u00e7ox g\u00fcv\u0259nir. \u018fg\u0259r snapshot m\u0259lumat kataloqunu (<code>$PGDATA<\/code>) v\u0259 WAL-\u0131 sinxronizasiyadan k\u0259nar \u0259l\u0259 ke\u00e7ir\u0259rs\u0259, PostgreSQL i\u015f\u0259 d\u00fc\u015fm\u0259y\u0259c\u0259k v\u0259 <code>PANIC: could not locate a valid checkpoint record<\/code> x\u0259tas\u0131 ver\u0259c\u0259k.<\/li>\n<li><strong>MySQL\/InnoDB:<\/strong> InnoDB c\u0131r\u0131lm\u0131\u015f s\u0259hif\u0259l\u0259rin qar\u015f\u0131s\u0131n\u0131 almaq \u00fc\u00e7\u00fcn doublewrite buffer-d\u0259n istifad\u0259 edir ki, bu da q\u0259za-ard\u0131c\u0131l v\u0259ziyy\u0259tl\u0259r\u0259 qar\u015f\u0131 m\u00fc\u0259yy\u0259n qoruma t\u0259min edir. Lakin, <code>ibdata1<\/code> fayl\u0131 v\u0259 <code>ib_logfile<\/code> sinxronizasiyadan k\u0259nar \u0259l\u0259 ke\u00e7iril\u0259rs\u0259, InnoDB m\u00fch\u0259rriki b\u0259rpa zaman\u0131 \u00e7\u00f6k\u0259c\u0259k.<\/li>\n<li><strong>Microsoft SQL Server:<\/strong> SQL Server I\/O dondurulmas\u0131na qar\u015f\u0131 \u00e7ox h\u0259ssasd\u0131r. D\u00fczg\u00fcn VSS (Volume Shadow Copy Service) inteqrasiyas\u0131 olmadan, SQL Server-i standart VM snapshotundan b\u0259rpa etm\u0259k \u00e7ox vaxt \u015f\u00fcbh\u0259li m\u0259lumat bazalar\u0131na v\u0259 q\u0131r\u0131lm\u0131\u015f loq z\u0259ncirl\u0259rin\u0259 s\u0259b\u0259b olacaq, bu da Point-in-Time Recovery (PITR) imkanlar\u0131n\u0131z\u0131 m\u0259hv ed\u0259c\u0259k.<\/li>\n<\/ul>\n<h2>Virtualizasiya edilmi\u015f M\u0259lumat Bazalar\u0131n\u0131 T\u0259hl\u00fck\u0259siz Ehtiyat N\u00fcsx\u0259l\u0259m\u0259k \u00fc\u00e7\u00fcn \u018fn Yax\u015f\u0131 T\u0259cr\u00fcb\u0259l\u0259r<\/h2>\n<p>Tranzaksiya m\u0259lumat bazalar\u0131n\u0131 qorumaq \u00fc\u00e7\u00fcn q\u0259za-ard\u0131c\u0131l ehtiyat n\u00fcsx\u0259l\u0259rd\u0259n <strong>t\u0259tbiq-ard\u0131c\u0131l (application-consistent)<\/strong> ehtiyat n\u00fcsx\u0259l\u0259r\u0259 ke\u00e7m\u0259lisiniz. Bu, ehtiyat n\u00fcsx\u0259 mexanizminin m\u0259lumat bazas\u0131 m\u00fch\u0259rriki il\u0259 \u0259laq\u0259 qurmas\u0131n\u0131, yadda\u015f\u0131 disk\u0259 bo\u015faltma\u011fa m\u0259cbur etm\u0259sini v\u0259 snapshot g\u00f6t\u00fcr\u00fcl\u0259rk\u0259n I\/O \u0259m\u0259liyyatlar\u0131n\u0131 m\u00fcv\u0259qq\u0259ti dayand\u0131rmas\u0131n\u0131 t\u0259l\u0259b edir.<\/p>\n<h3>1. T\u0259tbiq-M\u0259lumatl\u0131 Quiescing (VSS v\u0259 fsfreeze) istifad\u0259 edin<\/h3>\n<p><strong>Windows \u00fc\u00e7\u00fcn (SQL Server):<\/strong><br \/>\nEhtiyat n\u00fcsx\u0259 h\u0259llinizin Microsoft Volume Shadow Copy Service (VSS) istifad\u0259 etdiyin\u0259 h\u0259mi\u015f\u0259 \u0259min olun. VSS-m\u0259lumatl\u0131 ehtiyat n\u00fcsx\u0259 ba\u015flad\u0131ld\u0131qda, SQL Server VSS Writer m\u0259lumat bazas\u0131 I\/O-nu dondurur, g\u00f6zl\u0259y\u0259n tranzaksiyalar\u0131 disk\u0259 bo\u015fald\u0131r v\u0259 snapshotun m\u00fck\u0259mm\u0259l t\u0259tbiq-ard\u0131c\u0131l olmas\u0131n\u0131 t\u0259min edir.<\/p>\n<p><strong>Linux \u00fc\u00e7\u00fcn (PostgreSQL \/ MySQL):<\/strong><br \/>\nLinux-un VSS-\u0259 yerli ekvivalenti yoxdur. T\u0259tbiq ard\u0131c\u0131ll\u0131\u011f\u0131na nail olmaq \u00fc\u00e7\u00fcn hipervizorun qonaq al\u0259tl\u0259ri (m\u0259s\u0259l\u0259n, VMware Tools) il\u0259 birlikd\u0259 pre-freeze v\u0259 post-thaw skriptl\u0259rind\u0259n istifad\u0259 etm\u0259lisiniz.<\/p>\n<p>Budur PostgreSQL 15+ \u00fc\u00e7\u00fcn m\u0259lumat bazas\u0131n\u0131 snapshot \u00fc\u00e7\u00fcn t\u0259hl\u00fck\u0259siz \u015f\u0259kild\u0259 haz\u0131rlayan VMware <code>pre-freeze-script<\/code> n\u00fcmun\u0259si:<\/p>\n<pre><code class=\"language-bash\">#!\/bin\/bash\n# \/usr\/sbin\/pre-freeze-script\n# Bu skriptin icra edil\u0259 bil\u0259n (chmod +x) oldu\u011fundan \u0259min olun\n\n# 1. PostgreSQL-\u0259 ehtiyat n\u00fcsx\u0259 \u00fc\u00e7\u00fcn haz\u0131rla\u015fma\u011f\u0131 tap\u015f\u0131r\u0131n\nsu - postgres -c \"psql -c \"SELECT pg_backup_start('vm_snapshot', true);\"\"\n\n# 2. Fayl sistemi buferl\u0259rini disk\u0259 bo\u015fald\u0131n\nsync\n\n# 3. Fayl sistemini dondurun (m\u0259lumatlar\u0131n \/var\/lib\/pgsql-d\u0259 oldu\u011funu f\u0259rz ed\u0259r\u0259k)\nfsfreeze -f \/var\/lib\/pgsql\n<\/code><\/pre>\n<p>V\u0259 \u0259m\u0259liyyatlar\u0131 b\u0259rpa etm\u0259k \u00fc\u00e7\u00fcn m\u00fcvafiq <code>post-thaw-script<\/code>:<\/p>\n<pre><code class=\"language-bash\">#!\/bin\/bash\n# \/usr\/sbin\/post-thaw-script\n\n# 1. Fayl sisteminin dondurulmas\u0131n\u0131 dayand\u0131r\u0131n\nfsfreeze -u \/var\/lib\/pgsql\n\n# 2. PostgreSQL-\u0259 ehtiyat n\u00fcsx\u0259nin tamamland\u0131\u011f\u0131n\u0131 bildirin\nsu - postgres -c \"psql -c \"SELECT pg_backup_stop();\"\"\n<\/code><\/pre>\n<h3>2. Yerli M\u0259lumat Bazas\u0131 Ehtiyat N\u00fcsx\u0259 Vasit\u0259l\u0259rind\u0259n istifad\u0259 edin<\/h3>\n<p>T\u0259tbiq-ard\u0131c\u0131l snapshotlar standart snapshotlardan daha yax\u015f\u0131 olsa da, onlar h\u0259l\u0259 d\u0259 VM stun riski da\u015f\u0131y\u0131r. M\u0259lumat bazas\u0131 ehtiyat n\u00fcsx\u0259l\u0259ri \u00fc\u00e7\u00fcn \u0259n t\u0259hl\u00fck\u0259siz yana\u015fma, hipervizordan m\u00fcst\u0259qil i\u015fl\u0259y\u0259n yerli, ax\u0131nl\u0131 (streaming) ehtiyat n\u00fcsx\u0259 vasit\u0259l\u0259rind\u0259n istifad\u0259 etm\u0259kdir.<\/p>\n<p><strong>PostgreSQL (pg_basebackup):<\/strong><\/p>\n<pre><code class=\"language-bash\">pg_basebackup -h localhost -U replication_user -D \/mnt\/backups\/pg_backup -Ft -z -P\n<\/code><\/pre>\n<p><strong>MySQL\/MariaDB (Percona XtraBackup \/ Mariabackup):<\/strong><br \/>\nBu vasit\u0259l\u0259r m\u0259lumat fayllar\u0131n\u0131 kopyalayaraq v\u0259 eyni zamanda redo loqundak\u0131 d\u0259yi\u015fiklikl\u0259ri izl\u0259y\u0259r\u0259k isti, bloklamayan ehtiyat n\u00fcsx\u0259l\u0259r g\u00f6t\u00fcr\u00fcr.<\/p>\n<pre><code class=\"language-bash\">mariabackup --backup --target-dir=\/mnt\/backups\/mysql_backup --user=root --password=SecurePass\n<\/code><\/pre>\n<p><strong>SQL Server (T-SQL):<\/strong><\/p>\n<pre><code class=\"language-sql\">BACKUP DATABASE [ProductionDB] \nTO DISK = N'Z:BackupsProductionDB.bak' \nWITH NOFORMAT, NOINIT, NAME = N'ProductionDB-Full Backup', \nSKIP, NOREWIND, NOUNLOAD, COMPRESSION, STATS = 10;\nGO\n<\/code><\/pre>\n<h3>3. Loq Arxivl\u0259m\u0259 vasit\u0259sil\u0259 Point-in-Time Recovery (PITR) t\u0259tbiq edin<\/h3>\n<p>G\u00fcnd\u0259lik snapshot v\u0259 ya tam ehtiyat n\u00fcsx\u0259 sizi yaln\u0131z \u00e7\u0259kildiyi ana q\u0259d\u0259r qoruyur. \u018fg\u0259r m\u0259lumat bazan\u0131z saat 16:00-da \u00e7\u00f6k\u0259rs\u0259 v\u0259 son snapshotunuz saat 02:00-da olubsa, siz 14 saatl\u0131q tranzaksiya m\u0259lumat\u0131n\u0131 itirirsiniz. <\/p>\n<p>\u018fsl m\u00fc\u0259ssis\u0259 dayan\u0131ql\u0131l\u0131\u011f\u0131na nail olmaq \u00fc\u00e7\u00fcn tam t\u0259tbiq-ard\u0131c\u0131l ehtiyat n\u00fcsx\u0259l\u0259ri davaml\u0131 loq arxivl\u0259m\u0259 (WAL, Redo Logs v\u0259 ya Tranzaksiya Loqlar\u0131n\u0131 h\u0259r bir ne\u00e7\u0259 d\u0259qiq\u0259d\u0259n bir ehtiyat n\u00fcsx\u0259l\u0259m\u0259k) il\u0259 birl\u0259\u015fdirm\u0259lisiniz. Bu, DBA-lara m\u0259lumat bazas\u0131n\u0131 f\u0259lak\u0259td\u0259n \u0259vv\u0259l m\u00fc\u0259yy\u0259n bir d\u0259qiq\u0259y\u0259 v\u0259 ya h\u0259tta x\u00fcsusi bir tranzaksiya ID-sin\u0259 b\u0259rpa etm\u0259y\u0259 imkan verir.<\/p>\n<h2>CloudSave il\u0259 M\u00fc\u0259ssis\u0259 Ehtiyat N\u00fcsx\u0259 Strategiyalar\u0131<\/h2>\n<p>X\u00fcsusi pre-freeze skriptl\u0259rini, yerli dump-lar \u00fc\u00e7\u00fcn cron i\u015fl\u0259rini v\u0259 onlarla m\u0259lumat bazas\u0131 serverind\u0259 loq g\u00f6nd\u0259rilm\u0259sini idar\u0259 etm\u0259k DevOps komandalar\u0131 \u00fc\u00e7\u00fcn \u0259m\u0259liyyat kabusudur. M\u0259hz burada CloudSave kimi m\u00fc\u0259ssis\u0259 s\u0259viyy\u0259li platforma kritik \u0259h\u0259miyy\u0259t k\u0259sb edir.<\/p>\n<p>CloudSave virtualizasiya v\u0259 m\u0259lumat bazas\u0131 memarl\u0131\u011f\u0131 aras\u0131ndak\u0131 bo\u015flu\u011fu doldurur. Kor-koran\u0259 hipervizor snapshotlar\u0131na g\u00fcv\u0259nm\u0259k \u0259v\u0259zin\u0259, CloudSave SQL Server, PostgreSQL, MySQL v\u0259 Oracle il\u0259 yerli \u015f\u0259kild\u0259 inteqrasiya olunan t\u0259tbiq-m\u0259lumatl\u0131 agentl\u0259rd\u0259n istifad\u0259 edir.<\/p>\n<p>CloudSave ehtiyat n\u00fcsx\u0259ni ba\u015flatd\u0131qda:<br \/>\n1. Yerli API-l\u0259r vasit\u0259sil\u0259 (Windows \u00fc\u00e7\u00fcn VSS v\u0259 ya Linux \u00fc\u00e7\u00fcn yerli WAL ax\u0131n\u0131 kimi) birba\u015fa m\u0259lumat bazas\u0131 m\u00fch\u0259rriki il\u0259 \u0259laq\u0259 qurur.<br \/>\n2. Da\u011f\u0131d\u0131c\u0131 VM stun-lar\u0131na s\u0259b\u0259b olmadan yadda\u015f buferl\u0259rinin disk\u0259 bo\u015fald\u0131lmas\u0131n\u0131 orkestr edir.<br \/>\n3. M\u0259lumat fayllar\u0131n\u0131 t\u0259hl\u00fck\u0259siz \u015f\u0259kild\u0259 \u0259l\u0259 ke\u00e7irir v\u0259 tranzaksiya loqunun k\u0259silm\u0259sini avtomatik idar\u0259 edir.<br \/>\n4. Tranzaksiya loqlar\u0131n\u0131 davaml\u0131 olaraq ehtiyat n\u00fcsx\u0259l\u0259yir, bir ne\u00e7\u0259 klikl\u0259 qranulyar Point-in-Time Recovery (PITR) imkan\u0131 verir.<\/p>\n<p>T\u0259tbiq ard\u0131c\u0131ll\u0131\u011f\u0131n\u0131n m\u00fcr\u0259kk\u0259bliyini CloudSave-\u0259 y\u00fckl\u0259m\u0259kl\u0259, DBA-lar v\u0259 sistem administratorlar\u0131 istehsal klasterl\u0259rinin performans\u0131n\u0131 v\u0259 ya \u0259l\u00e7atanl\u0131\u011f\u0131n\u0131 qurban verm\u0259d\u0259n m\u0259lumat b\u00fct\u00f6vl\u00fcy\u00fcn\u0259 z\u0259man\u0259t ver\u0259 bil\u0259rl\u0259r.<\/p>\n<h2>N\u0259tic\u0259<\/h2>\n<p>Virtual ma\u015f\u0131n snapshotlar\u0131 infrastruktur idar\u0259etm\u0259si \u00fc\u00e7\u00fcn inan\u0131lmaz bir vasit\u0259dir, lakin onlar tranzaksiya m\u0259lumat bazalar\u0131n\u0131n ACID t\u0259l\u0259bl\u0259ri il\u0259 fundamental olaraq uy\u011fun deyil. Q\u0259za-ard\u0131c\u0131l hipervizor snapshotlar\u0131na g\u00fcv\u0259nm\u0259k t\u0259\u015fkilat\u0131n\u0131z\u0131 c\u0131r\u0131lm\u0131\u015f s\u0259hif\u0259l\u0259r, q\u0131r\u0131lm\u0131\u015f replikasiya z\u0259ncirl\u0259ri v\u0259 f\u0259lak\u0259tli m\u0259lumat itkisi il\u0259 \u00fcz-\u00fcz\u0259 qoyur.<\/p>\n<p>Missiya \u00fc\u00e7\u00fcn kritik m\u0259lumatlar\u0131n\u0131z\u0131 qorumaq \u00fc\u00e7\u00fcn t\u0259tbiq-m\u0259lumatl\u0131 quiescing t\u0259tbiq etm\u0259li, yerli m\u0259lumat bazas\u0131 ehtiyat n\u00fcsx\u0259 metodologiyalar\u0131ndan istifad\u0259 etm\u0259li v\u0259 davaml\u0131 tranzaksiya loqu arxivl\u0259rini saxlamal\u0131s\u0131n\u0131z. M\u0259qs\u0259dli m\u00fc\u0259ssis\u0259 ehtiyat n\u00fcsx\u0259 h\u0259ll\u0259rini q\u0259bul etm\u0259kl\u0259, m\u0259lumat bazalar\u0131n\u0131z\u0131n y\u00fcks\u0259k \u0259l\u00e7atan, tam b\u0259rpa oluna bil\u0259n v\u0259 tamamil\u0259 t\u0259hl\u00fck\u0259siz qalmas\u0131n\u0131 t\u0259min ed\u0259 bil\u0259rsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&gt; Discover why standard VM snapshots cause data corruption in transactional databases like PostgreSQL and SQL Server. Learn DBA best practices for application-consistent backups, avoiding VM stun, and ensuring data integrity with CloudSave.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"Why VM Snapshots Are Unsafe for Transactional Databases","rank_math_description":"> Discover why standard VM snapshots cause data corruption in transactional databases like PostgreSQL and SQL Server. Learn DBA best practices for application-consistent backups, avoiding VM stun, and ensuring data integrity with CloudSave.","rank_math_focus_keyword":"VM snapshots transactional databases","footnotes":""},"categories":[311],"tags":[3288,3554,3555,3556,3557,3558,3559],"class_list":["post-5465","post","type-post","status-publish","format-standard","hentry","category-database-backup","tag-data-integrity","tag-database-corruption","tag-database-recovery","tag-dba-guide","tag-hypervisor-snapshots","tag-transactional-databases","tag-vm-snapshots"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Why VM Snapshots Are Unsafe for Transactional Databases<\/title>\n<meta name=\"description\" content=\"&gt; Discover why standard VM snapshots cause data corruption in transactional databases like PostgreSQL and SQL Server. 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