{"id":5485,"date":"2026-06-15T14:01:13","date_gmt":"2026-06-15T14:01:13","guid":{"rendered":"https:\/\/cloudsave.app\/?p=5485"},"modified":"2026-06-15T15:56:42","modified_gmt":"2026-06-15T15:56:42","slug":"mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/","title":{"rendered":"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz"},"content":{"rendered":"<p>A DevOps m\u00e9rn\u00f6k\u00f6k \u00e9s rendszergazd\u00e1k sz\u00e1m\u00e1ra a virtu\u00e1lis g\u00e9p (VM) pillanatk\u00e9pek (snapshotok) alapvet\u0151 eszk\u00f6znek sz\u00e1m\u00edtanak. Gyors \u00e9s k\u00e9nyelmes m\u00f3dot biztos\u00edtanak a szerver \u00e1llapot\u00e1nak r\u00f6gz\u00edt\u00e9s\u00e9re egy kock\u00e1zatos jav\u00edt\u00e1s, jelent\u0151s konfigur\u00e1ci\u00f3s v\u00e1ltoztat\u00e1s vagy alkalmaz\u00e1stelep\u00edt\u00e9s el\u0151tt. Ha valami balul s\u00fcl el, a vissza\u00e1ll\u00edt\u00e1s m\u00e1sodpercek alatt elv\u00e9gezhet\u0151.<\/p>\n<p>Azonban, amikor ugyanezt a m\u00f3dszert tranzakci\u00f3s adatb\u00e1zisokra \u2013 p\u00e9ld\u00e1ul PostgreSQL, MySQL, Oracle vagy Microsoft SQL Server \u2013 alkalmazz\u00e1k, a VM pillanatk\u00e9pek biztons\u00e1gi h\u00e1l\u00f3b\u00f3l ketyeg\u0151 id\u0151z\u00edtett bomb\u00e1v\u00e1 v\u00e1lnak.<\/p>\n<p>A szabv\u00e1nyos hipervizor pillanatk\u00e9pekre val\u00f3 t\u00e1maszkod\u00e1s az adatb\u00e1zis-ment\u00e9sekn\u00e9l az adatkorrupci\u00f3, a \u201et\u00f6r\u00f6tt\u201d lapok (torn pages) \u00e9s a helyre\u00e1ll\u00edthatatlan \u00e9les le\u00e1ll\u00e1sok egyik leggyakoribb oka. Ebben a cikkben megvizsg\u00e1ljuk a hipervizorok \u00e9s az adatb\u00e1zis-motorok k\u00f6z\u00f6tti \u00e9p\u00edt\u00e9szeti \u00fctk\u00f6z\u00e9st, a pillanatk\u00e9pek k\u00e9sz\u00edt\u00e9se k\u00f6zbeni adatkorrupci\u00f3 mechanizmus\u00e1t, valamint azokat a m\u00e9rn\u00f6ki bev\u00e1lt gyakorlatokat, amelyek sz\u00fcks\u00e9gesek a virtualiz\u00e1lt adatb\u00e1zisok biztons\u00e1gos ment\u00e9s\u00e9hez.<\/p>\n<h2>Az \u00e9p\u00edt\u00e9szeti \u00fctk\u00f6z\u00e9s: Hipervizorok vs. Adatb\u00e1zis-motorok<\/h2>\n<p>Ahhoz, hogy meg\u00e9rts\u00fck, mi\u00e9rt vesz\u00e9lyeztetik a VM pillanatk\u00e9pek az adatb\u00e1zisokat, el\u0151sz\u00f6r meg kell vizsg\u00e1lnunk, hogyan kezelik mindk\u00e9t rendszer az \u00e1llapotot \u00e9s az I\/O m\u0171veleteket.<\/p>\n<h3>Hogyan hajtj\u00e1k v\u00e9gre a hipervizorok a pillanatk\u00e9peket<\/h3>\n<p>Amikor egy hipervizor (p\u00e9ld\u00e1ul VMware ESXi, Microsoft Hyper-V vagy KVM) pillanatk\u00e9pet k\u00e9sz\u00edt, nem m\u00e1solja le a lemezt. Ehelyett befagyasztja az aktu\u00e1lis virtu\u00e1lis lemezf\u00e1jlt (pl. <code>.vmdk<\/code> vagy <code>.vhdx<\/code>) \u00edr\u00e1sv\u00e9dett \u00e1llapotba, \u00e9s l\u00e9trehoz egy \u00faj delta lemezt (k\u00fcl\u00f6nb\u00f6zeti lemezt). Minden ezt k\u00f6vet\u0151 \u00edr\u00e1si m\u0171velet erre a delta lemezre ir\u00e1nyul.<\/p>\n<p>Amikor a pillanatk\u00e9pet t\u00f6rlik, a hipervizornak v\u00e9gleges\u00edtenie (konszolid\u00e1lnia) kell az adatokat a delta lemezr\u0151l vissza az alaplemezre. A szabv\u00e1nyos pillanatk\u00e9pek teljesen figyelmen k\u00edv\u00fcl hagyj\u00e1k a vend\u00e9g oper\u00e1ci\u00f3s rendszeren fut\u00f3 alkalmaz\u00e1sokat. A lemez \u00e1llapot\u00e1t pontosan \u00fagy r\u00f6gz\u00edtik, ahogy az abban a mikroszekundumban l\u00e9tezik.<\/p>\n<h3>Hogyan kezelik az \u00e1llapotot a tranzakci\u00f3s adatb\u00e1zisok<\/h3>\n<p>A tranzakci\u00f3s adatb\u00e1zisokat az ACID tulajdons\u00e1gok (Atomicit\u00e1s, Konzisztencia, Izol\u00e1ci\u00f3, Tart\u00f3ss\u00e1g) k\u00f6r\u00e9 tervezt\u00e9k. A nagy teljes\u00edtm\u00e9ny el\u00e9r\u00e9se \u00e9s az ACID-megfelel\u0151s\u00e9g fenntart\u00e1sa \u00e9rdek\u00e9ben az adatb\u00e1zisok nem \u00edrnak minden tranzakci\u00f3t azonnal k\u00f6zvetlen\u00fcl az els\u0151dleges adatf\u00e1jlokba a lemezen. Ehelyett egy komplex, t\u00f6bbr\u00e9teg\u0171 architekt\u00far\u00e1t haszn\u00e1lnak:<\/p>\n<ol>\n<li><strong>Buffer Pool \/ Shared Buffers:<\/strong> Az adatok beolvas\u00e1sa \u00e9s m\u00f3dos\u00edt\u00e1sa a rendszermem\u00f3ri\u00e1ban t\u00f6rt\u00e9nik.<\/li>\n<li><strong>Write-Ahead Log (WAL) \/ Redo Logs:<\/strong> A v\u00e1ltoz\u00e1sok szekvenci\u00e1lisan egy er\u0151sen optimaliz\u00e1lt napl\u00f3f\u00e1jlba \u00edr\u00f3dnak a lemezen a tart\u00f3ss\u00e1g biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/li>\n<li><strong>Checkpoints \/ Lazy Writers:<\/strong> Az adatb\u00e1zis id\u0151szakosan ki\u00edrja a m\u00f3dos\u00edtott (piszkos) lapokat a mem\u00f3ri\u00e1b\u00f3l a lemezen l\u00e9v\u0151 t\u00e9nyleges adatf\u00e1jlokba.<\/li>\n<\/ol>\n<p>Emiatt az architekt\u00fara miatt a lemezen l\u00e9v\u0151 fizikai adatf\u00e1jlok szinte mindig nincsenek szinkronban az adatb\u00e1zis aktu\u00e1lis \u00e1llapot\u00e1val. Az adatb\u00e1zis val\u00f3di \u00e1llapota csak a lemezen l\u00e9v\u0151 adatf\u00e1jlok, a WAL\/Redo napl\u00f3k \u00e9s a mem\u00f3ri\u00e1ban \u00e9ppen t\u00e1rolt adatok kombin\u00e1ci\u00f3jak\u00e9nt l\u00e9tezik.<\/p>\n<h2>A vesz\u00e9lyz\u00f3na: Mi t\u00f6rt\u00e9nik egy VM pillanatk\u00e9p k\u00e9sz\u00edt\u00e9sekor<\/h2>\n<p>Amikor egy adatb\u00e1zis-szerverr\u0151l szabv\u00e1nyos VM pillanatk\u00e9pet k\u00e9sz\u00edt, egy <strong>\u00f6sszeoml\u00e1s-konzisztens<\/strong> (crash-consistent) \u00e1llapotot r\u00f6gz\u00edt.<\/p>\n<h3>\u00d6sszeoml\u00e1s-konzisztencia vs. Alkalmaz\u00e1s-konzisztencia<\/h3>\n<p>Az \u00f6sszeoml\u00e1s-konzisztens pillanatk\u00e9p egyen\u00e9rt\u00e9k\u0171 azzal, mintha kih\u00fazn\u00e1 a t\u00e1pk\u00e1belt a fizikai szerverb\u0151l. A lemez \u00e1llapota r\u00f6gz\u00edt\u00e9sre ker\u00fcl, de ami a mem\u00f3ri\u00e1ban volt, az elveszik, \u00e9s ami \u00e9ppen a t\u00e1rol\u00f3vez\u00e9rl\u0151 fel\u00e9 tartott, az hirtelen megszakad.<\/p>\n<p>B\u00e1r a modern adatb\u00e1zisokat \u00fagy tervezt\u00e9k, hogy a Write-Ahead Log visszaj\u00e1tsz\u00e1s\u00e1val helyre\u00e1lljanak a v\u00e1ratlan \u00e1ramkimarad\u00e1sokb\u00f3l, a helyre\u00e1ll\u00edt\u00e1sra mint els\u0151dleges ment\u00e9si strat\u00e9gi\u00e1ra t\u00e1maszkodni rendk\u00edv\u00fcl vesz\u00e9lyes. Ha az adatb\u00e1zisa t\u00f6bb virtu\u00e1lis lemezen ter\u00fcl el (pl. adatf\u00e1jlok a <code>D: meghajt\u00f3n<\/code> \u00e9s WAL az <code>E: meghajt\u00f3n<\/code>), el\u0151fordulhat, hogy a hipervizor nem ugyanabban a mikroszekundumban k\u00e9sz\u00edt pillanatk\u00e9pet mindk\u00e9t lemezr\u0151l. Ha a WAL lemez pillanatk\u00e9pe ak\u00e1r egy t\u00f6red\u00e9km\u00e1sodperccel k\u00e9s\u0151bb k\u00e9sz\u00fcl el, mint az adatlemez\u00e9, az adatb\u00e1zis a vissza\u00e1ll\u00edt\u00e1skor nem tudja egyeztetni a sorsz\u00e1mokat, ami v\u00e9gzetes korrupci\u00f3hoz vezet.<\/p>\n<h3>A \u201eVM Stun\u201d hat\u00e1s a nagy tranzakci\u00f3s rendszereken<\/h3>\n<p>A pillanatk\u00e9p l\u00e9trehoz\u00e1s\u00e1nak folyamata \u2013 \u00e9s ami m\u00e9g fontosabb, a pillanatk\u00e9p konszolid\u00e1ci\u00f3ja \u2013 egy \u201eVM Stun\u201d (virtu\u00e1lis g\u00e9p lefagy\u00e1s) n\u00e9ven ismert jelens\u00e9get okoz.<\/p>\n<p>Ahhoz, hogy az I\/O-t biztons\u00e1gosan \u00e1tkapcsolja az alaplemezr\u0151l a delta lemezre, a hipervizornak r\u00f6vid id\u0151re sz\u00fcneteltetnie (lefagyasztania) kell a virtu\u00e1lis g\u00e9pet. Egy alacsony terhel\u00e9s\u0171 webszervern\u00e9l ez a lefagy\u00e1s 10-50 milliszekundumig tarthat, \u00e9s \u00e9szrev\u00e9tlen maradhat. Azonban egy hatalmas I\/O-val rendelkez\u0151, nagy \u00e1tereszt\u0151k\u00e9pess\u00e9g\u0171 adatb\u00e1zisn\u00e1l egy nagy delta lemez konszolid\u00e1ci\u00f3ja t\u00f6bb m\u00e1sodpercre is lefagyaszthatja a VM-et.<\/p>\n<p>A VM lefagy\u00e1sa alatt:<br \/>\n* A h\u00e1l\u00f3zati kapcsolatok megszakadnak, ami alkalmaz\u00e1s-id\u0151t\u00fall\u00e9p\u00e9seket okoz.<br \/>\n* A magas rendelkez\u00e9sre \u00e1ll\u00e1s\u00fa f\u00fcrt\u00f6k (mint az SQL Server Always On, PostgreSQL Patroni vagy MySQL Galera) elmulasztj\u00e1k a sz\u00edvver\u00e9s-ellen\u0151rz\u00e9seket.<br \/>\n* A f\u00fcrt azt felt\u00e9telezheti, hogy a lefagyott csom\u00f3pont halott, ami sz\u00fcks\u00e9gtelen \u00e9s zavar\u00f3 feladat\u00e1tv\u00e9telt (split-brain forgat\u00f3k\u00f6nyv) ind\u00edthat el.<\/p>\n<h3>T\u00f6r\u00f6tt lapok \u00e9s I\/O eltol\u00f3d\u00e1s<\/h3>\n<p>Az adatb\u00e1zis-motorok \u00e1ltal\u00e1ban meghat\u00e1rozott lapm\u00e9retekben (pl. 8KB a PostgreSQL \u00e9s SQL Server eset\u00e9ben, 16KB az InnoDB-n\u00e9l) \u00edrj\u00e1k az adatokat. Azonban az alapul szolg\u00e1l\u00f3 oper\u00e1ci\u00f3s rendszer \u00e9s a t\u00e1rol\u00f3t\u00f6mb\u00f6k kisebb blokkokban (pl. 4KB vagy 512 b\u00e1jt) dolgozz\u00e1k fel az I\/O-t.<\/p>\n<p>Ha egy hipervizor pontosan akkor k\u00e9sz\u00edt pillanatk\u00e9pet, amikor az adatb\u00e1zis egy 8KB-os lapot \u00edr, a pillanatk\u00e9p r\u00f6gz\u00edtheti az \u00faj adat els\u0151 4KB-j\u00e1t \u00e9s a r\u00e9gi adat utols\u00f3 4KB-j\u00e1t. Ez egy <strong>t\u00f6r\u00f6tt lapot<\/strong> (torn page) hoz l\u00e9tre. Amikor megpr\u00f3b\u00e1lja vissza\u00e1ll\u00edtani a pillanatk\u00e9pet, az adatb\u00e1zis beolvassa a lapot, a checksum-ellen\u0151rz\u00e9s sikertelen lesz, \u00e9s az adatb\u00e1zist korruptnak jel\u00f6li.<\/p>\n<h2>Val\u00f3s k\u00f6vetkezm\u00e9nyek konkr\u00e9t adatb\u00e1zis-motorokn\u00e1l<\/h2>\n<p>A k\u00fcl\u00f6nb\u00f6z\u0151 adatb\u00e1zis-motorok elt\u00e9r\u0151en reag\u00e1lnak az \u00f6sszeoml\u00e1s-konzisztens pillanatk\u00e9pekre, de egyik\u00fck sem kezeli azokat megfelel\u0151en \u00e9les k\u00f6rnyezetben.<\/p>\n<ul>\n<li><strong>PostgreSQL:<\/strong> A PostgreSQL nagym\u00e9rt\u00e9kben t\u00e1maszkodik a <code>pg_wal<\/code> k\u00f6nyvt\u00e1rra. Ha egy pillanatk\u00e9p az adatk\u00f6nyvt\u00e1rat (<code>$PGDATA<\/code>) \u00e9s a WAL-t nem szinkronban r\u00f6gz\u00edti, a PostgreSQL nem indul el, \u00e9s <code>PANIC: could not locate a valid checkpoint record<\/code> hiba\u00fczenetet dob.<\/li>\n<li><strong>MySQL\/InnoDB:<\/strong> Az InnoDB egy \u201edoublewrite buffer\u201d-t haszn\u00e1l a t\u00f6r\u00f6tt lapok megel\u0151z\u00e9s\u00e9re, ami n\u00e9mi v\u00e9delmet ny\u00fajt az \u00f6sszeoml\u00e1s-konzisztens \u00e1llapotok ellen. Azonban, ha az <code>ibdata1<\/code> f\u00e1jl \u00e9s az <code>ib_logfile<\/code> nem szinkronban ker\u00fcl r\u00f6gz\u00edt\u00e9sre, az InnoDB motor \u00f6sszeomlik a helyre\u00e1ll\u00edt\u00e1skor.<\/li>\n<li><strong>Microsoft SQL Server:<\/strong> Az SQL Server rendk\u00edv\u00fcl \u00e9rz\u00e9keny az I\/O lefagyaszt\u00e1s\u00e1ra. Megfelel\u0151 VSS (Volume Shadow Copy Service) integr\u00e1ci\u00f3 n\u00e9lk\u00fcl az SQL Server szabv\u00e1nyos VM pillanatk\u00e9pb\u0151l t\u00f6rt\u00e9n\u0151 vissza\u00e1ll\u00edt\u00e1sa gyakran \u201egyan\u00fas\u201d (suspect) adatb\u00e1zisokhoz \u00e9s megszakadt napl\u00f3l\u00e1ncokhoz vezet, t\u00f6nkret\u00e9ve az id\u0151pontra t\u00f6rt\u00e9n\u0151 helyre\u00e1ll\u00edt\u00e1si (PITR) k\u00e9pess\u00e9geit.<\/li>\n<\/ul>\n<h2>Bev\u00e1lt gyakorlatok a virtualiz\u00e1lt adatb\u00e1zisok biztons\u00e1gos ment\u00e9s\u00e9hez<\/h2>\n<p>A tranzakci\u00f3s adatb\u00e1zisok v\u00e9delme \u00e9rdek\u00e9ben az \u00f6sszeoml\u00e1s-konzisztens ment\u00e9sekr\u0151l \u00e1t kell t\u00e9rnie az <strong>alkalmaz\u00e1s-konzisztens<\/strong> ment\u00e9sekre. Ehhez a ment\u00e9si mechanizmusnak kommunik\u00e1lnia kell az adatb\u00e1zis-motorral, k\u00e9nyszer\u00edtve azt a mem\u00f3ria lemezre t\u00f6rt\u00e9n\u0151 ki\u00edr\u00e1s\u00e1ra \u00e9s az I\/O m\u0171veletek pillanatnyi sz\u00fcneteltet\u00e9s\u00e9re, am\u00edg a pillanatk\u00e9p elk\u00e9sz\u00fcl.<\/p>\n<h3>1. Alkalmaz\u00e1s-tudatos nyugtat\u00e1s (VSS \u00e9s fsfreeze) haszn\u00e1lata<\/h3>\n<p><strong>Windows (SQL Server) eset\u00e9n:<\/strong><br \/>\nMindig gy\u0151z\u0151dj\u00f6n meg arr\u00f3l, hogy a ment\u00e9si megold\u00e1sa haszn\u00e1lja a Microsoft Volume Shadow Copy Service-t (VSS). Amikor egy VSS-tudatos ment\u00e9s elindul, az SQL Server VSS Writer lefagyasztja az adatb\u00e1zis I\/O-t, ki\u00edrja a f\u00fcgg\u0151ben l\u00e9v\u0151 tranzakci\u00f3kat a lemezre, \u00e9s biztos\u00edtja, hogy a pillanatk\u00e9p t\u00f6k\u00e9letesen alkalmaz\u00e1s-konzisztens legyen.<\/p>\n<p><strong>Linux (PostgreSQL \/ MySQL) eset\u00e9n:<\/strong><br \/>\nA Linuxnak nincs nat\u00edv megfelel\u0151je a VSS-nek. Az alkalmaz\u00e1s-konzisztencia el\u00e9r\u00e9s\u00e9hez a hipervizor vend\u00e9geszk\u00f6zeivel (pl. VMware Tools) egy\u00fcttm\u0171k\u00f6dve \u201epre-freeze\u201d \u00e9s \u201epost-thaw\u201d szkripteket kell haszn\u00e1lnia.<\/p>\n<p>\u00cdme egy p\u00e9lda egy VMware <code>pre-freeze-script<\/code>-re PostgreSQL 15+ verzi\u00f3hoz, amely biztons\u00e1gosan el\u0151k\u00e9sz\u00edti az adatb\u00e1zist a pillanatk\u00e9phez:<\/p>\n<pre><code class=\"language-bash\">#!\/bin\/bash\n# \/usr\/sbin\/pre-freeze-script\n# Gy\u0151z\u0151dj\u00f6n meg r\u00f3la, hogy a szkript futtathat\u00f3 (chmod +x)\n\n# 1. Utas\u00edtsa a PostgreSQL-t a ment\u00e9sre val\u00f3 felk\u00e9sz\u00fcl\u00e9sre\nsu - postgres -c \"psql -c \"SELECT pg_backup_start('vm_snapshot', true);\"\"\n\n# 2. F\u00e1jlrendszer-pufferek ki\u00edr\u00e1sa a lemezre\nsync\n\n# 3. F\u00e1jlrendszer lefagyaszt\u00e1sa (felt\u00e9telezve, hogy az adatok a \/var\/lib\/pgsql k\u00f6nyvt\u00e1rban vannak)\nfsfreeze -f \/var\/lib\/pgsql\n<\/code><\/pre>\n<p>\u00c9s a megfelel\u0151 <code>post-thaw-script<\/code> a m\u0171veletek folytat\u00e1s\u00e1hoz:<\/p>\n<pre><code class=\"language-bash\">#!\/bin\/bash\n# \/usr\/sbin\/post-thaw-script\n\n# 1. F\u00e1jlrendszer lefagyaszt\u00e1s\u00e1nak felold\u00e1sa\nfsfreeze -u \/var\/lib\/pgsql\n\n# 2. \u00c9rtes\u00edtse a PostgreSQL-t, hogy a ment\u00e9s befejez\u0151d\u00f6tt\nsu - postgres -c \"psql -c \"SELECT pg_backup_stop();\"\"\n<\/code><\/pre>\n<h3>2. Nat\u00edv adatb\u00e1zis-ment\u00e9si seg\u00e9dprogramok haszn\u00e1lata<\/h3>\n<p>B\u00e1r az alkalmaz\u00e1s-konzisztens pillanatk\u00e9pek jobbak, mint a szabv\u00e1nyosak, tov\u00e1bbra is fenn\u00e1ll a VM lefagy\u00e1s kock\u00e1zata. Az adatb\u00e1zis-ment\u00e9sek legbiztons\u00e1gosabb m\u00f3dja a nat\u00edv, streamel\u0151 ment\u00e9si seg\u00e9dprogramok haszn\u00e1lata, amelyek a hipervizort\u00f3l f\u00fcggetlen\u00fcl m\u0171k\u00f6dnek.<\/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 \/>\nEzek az eszk\u00f6z\u00f6k \u201ehot\u201d, nem blokkol\u00f3 ment\u00e9seket k\u00e9sz\u00edtenek az adatf\u00e1jlok m\u00e1sol\u00e1s\u00e1val \u00e9s a redo logban t\u00f6rt\u00e9n\u0151 v\u00e1ltoz\u00e1sok egyidej\u0171 k\u00f6vet\u00e9s\u00e9vel.<\/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. Id\u0151pontra t\u00f6rt\u00e9n\u0151 helyre\u00e1ll\u00edt\u00e1s (PITR) megval\u00f3s\u00edt\u00e1sa napl\u00f3archiv\u00e1l\u00e1ssal<\/h3>\n<p>A napi pillanatk\u00e9p vagy teljes ment\u00e9s csak az elk\u00e9sz\u00edt\u00e9s\u00e9nek pillanat\u00e1ig ny\u00fajt v\u00e9delmet. Ha az adatb\u00e1zisa 16:00-kor omlik \u00f6ssze, \u00e9s az utols\u00f3 pillanatk\u00e9pe 02:00-kor k\u00e9sz\u00fclt, 14 \u00f3r\u00e1nyi tranzakci\u00f3s adatot vesz\u00edt.<\/p>\n<p>A val\u00f3di v\u00e1llalati rugalmass\u00e1g el\u00e9r\u00e9s\u00e9hez kombin\u00e1lnia kell a teljes alkalmaz\u00e1s-konzisztens ment\u00e9seket a folyamatos napl\u00f3archiv\u00e1l\u00e1ssal (a WAL, Redo napl\u00f3k vagy tranzakci\u00f3s napl\u00f3k n\u00e9h\u00e1ny percenk\u00e9nti ment\u00e9s\u00e9vel). Ez lehet\u0151v\u00e9 teszi az adatb\u00e1zis-adminisztr\u00e1torok sz\u00e1m\u00e1ra, hogy az adatb\u00e1zist egy adott percre vagy ak\u00e1r egy konkr\u00e9t tranzakci\u00f3azonos\u00edt\u00f3ra \u00e1ll\u00edts\u00e1k vissza a katasztr\u00f3fa el\u0151tt.<\/p>\n<h2>V\u00e1llalati ment\u00e9si strat\u00e9gi\u00e1k a CloudSave-vel<\/h2>\n<p>Az egyedi \u201epre-freeze\u201d szkriptek, a nat\u00edv dumpokhoz tartoz\u00f3 cron jobok \u00e9s a napl\u00f3k tov\u00e1bb\u00edt\u00e1s\u00e1nak kezel\u00e9se t\u00f6bb tucat adatb\u00e1zis-szerveren r\u00e9m\u00e1lom a DevOps csapatok sz\u00e1m\u00e1ra. Itt v\u00e1lik kritikuss\u00e1 egy v\u00e1llalati szint\u0171 platform, mint a CloudSave.<\/p>\n<p>A CloudSave \u00e1thidalja a szakad\u00e9kot a virtualiz\u00e1ci\u00f3 \u00e9s az adatb\u00e1zis-architekt\u00fara k\u00f6z\u00f6tt. Ahelyett, hogy vak hipervizor pillanatk\u00e9pekre t\u00e1maszkodna, a CloudSave alkalmaz\u00e1s-tudatos \u00fcgyn\u00f6k\u00f6ket haszn\u00e1l, amelyek nat\u00edvan integr\u00e1l\u00f3dnak az SQL Serverrel, PostgreSQL-lel, MySQL-lel \u00e9s Oracle-lel.<\/p>\n<p>Amikor a CloudSave elind\u00edt egy ment\u00e9st:<br \/>\n1. K\u00f6zvetlen\u00fcl kommunik\u00e1l az adatb\u00e1zis-motorral nat\u00edv API-kon kereszt\u00fcl (mint a VSS Windows eset\u00e9n vagy nat\u00edv WAL streamel\u00e9s Linux eset\u00e9n).<br \/>\n2. Megszervezi a mem\u00f3riapufferek lemezre t\u00f6rt\u00e9n\u0151 ki\u00edr\u00e1s\u00e1t an\u00e9lk\u00fcl, hogy zavar\u00f3 VM lefagy\u00e1sokat okozna.<br \/>\n3. Biztons\u00e1gosan r\u00f6gz\u00edti az adatf\u00e1jlokat \u00e9s automatikusan kezeli a tranzakci\u00f3s napl\u00f3k csonkol\u00e1s\u00e1t.<br \/>\n4. Folyamatosan menti a tranzakci\u00f3s napl\u00f3kat, lehet\u0151v\u00e9 t\u00e9ve a r\u00e9szletes id\u0151pontra t\u00f6rt\u00e9n\u0151 helyre\u00e1ll\u00edt\u00e1st (PITR) n\u00e9h\u00e1ny kattint\u00e1ssal.<\/p>\n<p>Az alkalmaz\u00e1s-konzisztencia komplexit\u00e1s\u00e1nak CloudSave-re t\u00f6rt\u00e9n\u0151 \u00e1th\u00e1r\u00edt\u00e1s\u00e1val az adatb\u00e1zis-adminisztr\u00e1torok \u00e9s rendszergazd\u00e1k garant\u00e1lhatj\u00e1k az adatok integrit\u00e1s\u00e1t an\u00e9lk\u00fcl, hogy fel\u00e1ldozn\u00e1k az \u00e9les f\u00fcrtjeik teljes\u00edtm\u00e9ny\u00e9t vagy rendelkez\u00e9sre \u00e1ll\u00e1s\u00e1t.<\/p>\n<h2>K\u00f6vetkeztet\u00e9s<\/h2>\n<p>A virtu\u00e1lis g\u00e9p pillanatk\u00e9pek hihetetlen eszk\u00f6z\u00f6k az infrastrukt\u00fara-kezel\u00e9shez, de alapvet\u0151en \u00f6sszeegyeztethetetlenek a tranzakci\u00f3s adatb\u00e1zisok ACID k\u00f6vetelm\u00e9nyeivel. Az \u00f6sszeoml\u00e1s-konzisztens hipervizor pillanatk\u00e9pekre val\u00f3 t\u00e1maszkod\u00e1s t\u00f6r\u00f6tt lapoknak, megszakadt replik\u00e1ci\u00f3s l\u00e1ncoknak \u00e9s katasztrof\u00e1lis adatveszt\u00e9snek teszi ki a szervezet\u00e9t.<\/p>\n<p>A kritikus fontoss\u00e1g\u00fa adatok v\u00e9delme \u00e9rdek\u00e9ben alkalmaz\u00e1s-tudatos nyugtat\u00e1st kell bevezetnie, nat\u00edv adatb\u00e1zis-ment\u00e9si m\u00f3dszertanokat kell alkalmaznia, \u00e9s folyamatos tranzakci\u00f3s napl\u00f3arch\u00edvumokat kell fenntartania. A c\u00e9lzott v\u00e1llalati ment\u00e9si megold\u00e1sok alkalmaz\u00e1s\u00e1val biztos\u00edthatja, hogy adatb\u00e1zisai tov\u00e1bbra is magas rendelkez\u00e9sre \u00e1ll\u00e1s\u00faak, teljes m\u00e9rt\u00e9kben helyre\u00e1ll\u00edthat\u00f3ak \u00e9s teljesen biztons\u00e1gosak maradjanak.<\/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":[471],"tags":[3368,3674,3675,3676,3677,3678,3679],"class_list":["post-5485","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. Learn DBA best practices for application-consistent backups, avoiding VM stun, and ensuring data integrity with CloudSave.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz\" \/>\n<meta property=\"og:description\" content=\"&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.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/\" \/>\n<meta property=\"og:site_name\" content=\"CloudSave\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-15T14:01:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-15T15:56:42+00:00\" \/>\n<meta name=\"author\" content=\"shervinrv\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Szerz\u0151:\" \/>\n\t<meta name=\"twitter:data1\" content=\"shervinrv\" \/>\n\t<meta name=\"twitter:label2\" content=\"Becs\u00fclt olvas\u00e1si id\u0151\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 perc\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/\"},\"author\":{\"name\":\"shervinrv\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#\\\/schema\\\/person\\\/286beefe68281d868e87f46603a7ae4d\"},\"headline\":\"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz\",\"datePublished\":\"2026-06-15T14:01:13+00:00\",\"dateModified\":\"2026-06-15T15:56:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/\"},\"wordCount\":2258,\"publisher\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#\\\/schema\\\/person\\\/286beefe68281d868e87f46603a7ae4d\"},\"keywords\":[\"data integrity\",\"database corruption\",\"database recovery\",\"DBA guide\",\"hypervisor snapshots\",\"transactional databases\",\"VM snapshots\"],\"articleSection\":[\"Database Backup\"],\"inLanguage\":\"hu\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/\",\"url\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/\",\"name\":\"Why VM Snapshots Are Unsafe for Transactional Databases\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#website\"},\"datePublished\":\"2026-06-15T14:01:13+00:00\",\"dateModified\":\"2026-06-15T15:56:42+00:00\",\"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.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/#breadcrumb\"},\"inLanguage\":\"hu\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#website\",\"url\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/\",\"name\":\"CloudSave\",\"description\":\"CloudSave\",\"publisher\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#\\\/schema\\\/person\\\/286beefe68281d868e87f46603a7ae4d\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"hu\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/#\\\/schema\\\/person\\\/286beefe68281d868e87f46603a7ae4d\",\"name\":\"shervinrv\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"hu\",\"@id\":\"https:\\\/\\\/cloudsave.app\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Logo_Name-2.png\",\"url\":\"https:\\\/\\\/cloudsave.app\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Logo_Name-2.png\",\"contentUrl\":\"https:\\\/\\\/cloudsave.app\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Logo_Name-2.png\",\"width\":859,\"height\":150,\"caption\":\"shervinrv\"},\"logo\":{\"@id\":\"https:\\\/\\\/cloudsave.app\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Logo_Name-2.png\"},\"sameAs\":[\"http:\\\/\\\/cloudsave.app\"],\"url\":\"https:\\\/\\\/cloudsave.app\\\/hu\\\/knowledge-base\\\/author\\\/shervinrv\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Why VM Snapshots Are Unsafe for Transactional Databases","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.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/","og_locale":"hu_HU","og_type":"article","og_title":"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz","og_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.","og_url":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/","og_site_name":"CloudSave","article_published_time":"2026-06-15T14:01:13+00:00","article_modified_time":"2026-06-15T15:56:42+00:00","author":"shervinrv","twitter_card":"summary_large_image","twitter_misc":{"Szerz\u0151:":"shervinrv","Becs\u00fclt olvas\u00e1si id\u0151":"12 perc"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/#article","isPartOf":{"@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/"},"author":{"name":"shervinrv","@id":"https:\/\/cloudsave.app\/hu\/#\/schema\/person\/286beefe68281d868e87f46603a7ae4d"},"headline":"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz","datePublished":"2026-06-15T14:01:13+00:00","dateModified":"2026-06-15T15:56:42+00:00","mainEntityOfPage":{"@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/"},"wordCount":2258,"publisher":{"@id":"https:\/\/cloudsave.app\/hu\/#\/schema\/person\/286beefe68281d868e87f46603a7ae4d"},"keywords":["data integrity","database corruption","database recovery","DBA guide","hypervisor snapshots","transactional databases","VM snapshots"],"articleSection":["Database Backup"],"inLanguage":"hu"},{"@type":"WebPage","@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/","url":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/","name":"Why VM Snapshots Are Unsafe for Transactional Databases","isPartOf":{"@id":"https:\/\/cloudsave.app\/hu\/#website"},"datePublished":"2026-06-15T14:01:13+00:00","dateModified":"2026-06-15T15:56:42+00:00","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.","breadcrumb":{"@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/#breadcrumb"},"inLanguage":"hu","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/cloudsave.app\/hu\/knowledge-base\/mi%c3%a9rt-nem-biztons%c3%a1gosak-a-vm-pillanatk%c3%a9pek-tranzakci%c3%b3s-adatb%c3%a1zisokhoz-dba-%c3%batmutat%c3%b3-az-adatintegrit%c3%a1shoz\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/cloudsave.app\/hu\/"},{"@type":"ListItem","position":2,"name":"Mi\u00e9rt nem biztons\u00e1gosak a VM-pillanatk\u00e9pek tranzakci\u00f3s adatb\u00e1zisokhoz: DBA-\u00fatmutat\u00f3 az adatintegrit\u00e1shoz"}]},{"@type":"WebSite","@id":"https:\/\/cloudsave.app\/hu\/#website","url":"https:\/\/cloudsave.app\/hu\/","name":"CloudSave","description":"CloudSave","publisher":{"@id":"https:\/\/cloudsave.app\/hu\/#\/schema\/person\/286beefe68281d868e87f46603a7ae4d"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/cloudsave.app\/hu\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"hu"},{"@type":["Person","Organization"],"@id":"https:\/\/cloudsave.app\/hu\/#\/schema\/person\/286beefe68281d868e87f46603a7ae4d","name":"shervinrv","image":{"@type":"ImageObject","inLanguage":"hu","@id":"https:\/\/cloudsave.app\/wp-content\/uploads\/2026\/02\/Logo_Name-2.png","url":"https:\/\/cloudsave.app\/wp-content\/uploads\/2026\/02\/Logo_Name-2.png","contentUrl":"https:\/\/cloudsave.app\/wp-content\/uploads\/2026\/02\/Logo_Name-2.png","width":859,"height":150,"caption":"shervinrv"},"logo":{"@id":"https:\/\/cloudsave.app\/wp-content\/uploads\/2026\/02\/Logo_Name-2.png"},"sameAs":["http:\/\/cloudsave.app"],"url":"https:\/\/cloudsave.app\/hu\/knowledge-base\/author\/shervinrv\/"}]}},"_links":{"self":[{"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/posts\/5485","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/comments?post=5485"}],"version-history":[{"count":3,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/posts\/5485\/revisions"}],"predecessor-version":[{"id":5807,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/posts\/5485\/revisions\/5807"}],"wp:attachment":[{"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/media?parent=5485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/categories?post=5485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cloudsave.app\/hu\/wp-json\/wp\/v2\/tags?post=5485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}