{"id":5486,"date":"2026-06-15T14:01:13","date_gmt":"2026-06-15T14:01:13","guid":{"rendered":"https:\/\/cloudsave.app\/?p=5486"},"modified":"2026-06-15T15:57:19","modified_gmt":"2026-06-15T15:57:19","slug":"af-hverju-vm-skyndimyndir-eru-ekki-%c3%b6ruggar-fyrir-gagnagrunna-me%c3%b0-f%c3%a6rsluvinnslu-lei%c3%b0arv%c3%adsir-gagnagrunnsstj%c3%b3ra-um-gagnaheilleika","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/is\/knowledge-base\/af-hverju-vm-skyndimyndir-eru-ekki-%c3%b6ruggar-fyrir-gagnagrunna-me%c3%b0-f%c3%a6rsluvinnslu-lei%c3%b0arv%c3%adsir-gagnagrunnsstj%c3%b3ra-um-gagnaheilleika\/","title":{"rendered":"Af hverju VM-skyndimyndir eru ekki \u00f6ruggar fyrir gagnagrunna me\u00f0 f\u00e6rsluvinnslu: Lei\u00f0arv\u00edsir gagnagrunnsstj\u00f3ra um gagnaheilleika"},"content":{"rendered":"

Fyrir DevOps-verkfr\u00e6\u00f0inga og kerfisstj\u00f3ra eru skyndimyndir (snapshots) af s\u00fdndarv\u00e9lum (VM) grundvallart\u00e6ki. \u00de\u00e6r bj\u00f3\u00f0a upp \u00e1 skj\u00f3ta og \u00fe\u00e6gilega lei\u00f0 til a\u00f0 fanga \u00e1stand net\u00fej\u00f3ns fyrir \u00e1h\u00e6ttusamar uppf\u00e6rslur, st\u00f3rar breytingar \u00e1 stillingum e\u00f0a uppsetningu forrita. Ef eitthva\u00f0 fer \u00farskei\u00f0is tekur a\u00f0eins nokkrar sek\u00fandur a\u00f0 sn\u00faa breytingum vi\u00f0.<\/p>\n

Hins vegar, \u00feegar \u00feessi sama a\u00f0fer\u00f0afr\u00e6\u00f0i er notu\u00f0 \u00e1 gagnagrunna sem byggja \u00e1 f\u00e6rslum (transactional databases) \u2014 svo sem PostgreSQL, MySQL, Oracle e\u00f0a Microsoft SQL Server \u2014 breytast skyndimyndir s\u00fdndarv\u00e9la \u00far \u00f6ryggisneti \u00ed t\u00edmasprengju.<\/p>\n

A\u00f0 treysta \u00e1 sta\u00f0la\u00f0ar skyndimyndir fr\u00e1 s\u00fdndarv\u00e9last\u00fdrikerfum (hypervisors) fyrir afritun gagnagrunna er ein algengasta ors\u00f6k gagnaey\u00f0ileggingar, \u201erifinna s\u00ed\u00f0na\u201c (torn pages) og \u00f3b\u00e6tanlegra truflana \u00ed framlei\u00f0sluumhverfi. \u00cd \u00feessari grein munum vi\u00f0 sko\u00f0a \u00e1reksturinn \u00ed arkitekt\u00far milli s\u00fdndarv\u00e9last\u00fdrikerfa og gagnagrunnsv\u00e9la, hvernig gagnaey\u00f0ilegging \u00e1 s\u00e9r sta\u00f0 vi\u00f0 skyndimyndat\u00f6ku og bestu verkfr\u00e6\u00f0ilegu starfsvenjur sem \u00fearf til a\u00f0 taka \u00f6rugg afrit af s\u00fdndum gagnagrunnum.<\/p>\n

\u00c1rekstur arkitekt\u00fara: S\u00fdndarv\u00e9last\u00fdrikerfi vs. gagnagrunnsv\u00e9lar<\/h2>\n

Til a\u00f0 skilja hvers vegna skyndimyndir s\u00fdndarv\u00e9la \u00f3gna gagnagrunnum ver\u00f0um vi\u00f0 fyrst a\u00f0 sko\u00f0a hvernig b\u00e6\u00f0i kerfin st\u00fdra \u00e1standi og I\/O-a\u00f0ger\u00f0um.<\/p>\n

Hvernig s\u00fdndarv\u00e9last\u00fdrikerfi framkv\u00e6ma skyndimyndir<\/h3>\n

\u00deegar s\u00fdndarv\u00e9last\u00fdrikerfi (eins og VMware ESXi, Microsoft Hyper-V e\u00f0a KVM) tekur skyndimynd, afritar \u00fea\u00f0 ekki diskinn. \u00cd sta\u00f0inn frystir \u00fea\u00f0 n\u00faverandi s\u00fdndardiskaskr\u00e1 (t.d. .vmdk<\/code> e\u00f0a .vhdx<\/code>) \u00ed skrifvar\u00f0 \u00e1stand og b\u00fdr til n\u00fdjan mismunadisk (delta disk). Allar s\u00ed\u00f0ari skrifa\u00f0ger\u00f0ir eru beint \u00e1 \u00feennan mismunadisk.<\/p>\n

\u00deegar skyndimyndinni er eytt ver\u00f0ur s\u00fdndarv\u00e9last\u00fdrikerfi\u00f0 a\u00f0 sameina (consolidate) g\u00f6gnin \u00far mismunadisknum aftur inn \u00ed grunndiskinn. Sta\u00f0la\u00f0ar skyndimyndir hafa enga vitneskju um \u00feau forrit sem keyra inni \u00ed gestast\u00fdrikerfinu. \u00de\u00e6r fanga \u00e1stand disksins n\u00e1kv\u00e6mlega eins og \u00fea\u00f0 er \u00e1 \u00fev\u00ed \u00f6rsek\u00fandubroti.<\/p>\n

Hvernig gagnagrunnar st\u00fdra \u00e1standi<\/h3>\n

Gagnagrunnar sem byggja \u00e1 f\u00e6rslum eru hanna\u00f0ir \u00ed kringum ACID-eiginleika (Atomicity, Consistency, Isolation, Durability). Til a\u00f0 n\u00e1 miklum afk\u00f6stum \u00e1 me\u00f0an ACID-samr\u00e6mi er vi\u00f0haldi\u00f0, skrifa gagnagrunnar ekki hverja f\u00e6rslu beint \u00ed a\u00f0algagnaskr\u00e1rnar \u00e1 disknum strax. \u00cd sta\u00f0inn nota \u00feeir fl\u00f3kinn, fj\u00f6llaga arkitekt\u00far:<\/p>\n

    \n
  1. Buffer Pool \/ Shared Buffers:<\/strong> G\u00f6gn eru lesin inn \u00ed og breytt \u00ed vinnsluminni kerfisins.<\/li>\n
  2. Write-Ahead Log (WAL) \/ Redo Logs:<\/strong> Breytingar eru skrifa\u00f0ar \u00ed r\u00f6\u00f0 \u00ed mj\u00f6g f\u00ednstillta ann\u00e1laskr\u00e1 \u00e1 disknum til a\u00f0 tryggja varanleika.<\/li>\n
  3. Checkpoints \/ Lazy Writers:<\/strong> Me\u00f0 reglulegu millibili skolar gagnagrunnurinn breyttum s\u00ed\u00f0um \u00far vinnsluminni yfir \u00ed raunverulegar gagnaskr\u00e1r \u00e1 disknum.<\/li>\n<\/ol>\n

    Vegna \u00feessa arkitekt\u00fars eru l\u00edkamlegar gagnaskr\u00e1r \u00e1 disknum n\u00e6stum alltaf \u00far takti vi\u00f0 raunverulegt \u00e1stand gagnagrunnsins. Sanna \u00e1stand gagnagrunnsins er a\u00f0eins til sem samsetning af gagnaskr\u00e1m \u00e1 disknum, WAL\/Redo-ann\u00e1lum og \u00feeim g\u00f6gnum sem eru \u00ed vinnsluminni hverju sinni.<\/p>\n

    H\u00e6ttusv\u00e6\u00f0i\u00f0: Hva\u00f0 gerist vi\u00f0 skyndimyndat\u00f6ku s\u00fdndarv\u00e9lar<\/h2>\n

    \u00deegar \u00fe\u00fa tekur sta\u00f0la\u00f0a skyndimynd af gagnagrunns\u00fej\u00f3ni ertu a\u00f0 fanga \u00e1stand sem er \u201ecrash-consistent\u201c<\/strong> (samr\u00e6mt vi\u00f0 kerfishrun).<\/p>\n

    Samr\u00e6mi vi\u00f0 kerfishrun vs. samr\u00e6mi vi\u00f0 forrit<\/h3>\n

    Skyndimynd sem er \u201ecrash-consistent\u201c jafngildir \u00fev\u00ed a\u00f0 kippa rafmagnssn\u00farunni \u00far l\u00edkamlega \u00fej\u00f3ninum. \u00c1stand disksins er fanga\u00f0, en allt sem var \u00ed vinnsluminni glatast og allt sem var \u00e1 lei\u00f0inni \u00ed geymslust\u00fdringuna er skyndilega rofi\u00f0.<\/p>\n

    \u00de\u00f3tt n\u00fat\u00edma gagnagrunnar s\u00e9u hanna\u00f0ir til a\u00f0 jafna sig eftir \u00f3v\u00e6nt rafmagnsleysi me\u00f0 \u00fev\u00ed a\u00f0 spila Write-Ahead Log-ann\u00e1lana aftur, er mj\u00f6g h\u00e6ttulegt a\u00f0 treysta \u00e1 \u00fea\u00f0 sem a\u00f0al-afritunarstefnu. Ef gagnagrunnurinn \u00feinn spannar marga s\u00fdndardiska (t.d. gagnaskr\u00e1r \u00e1 Drifi D:<\/code> og WAL \u00e1 Drifi E:<\/code>), g\u00e6ti s\u00fdndarv\u00e9last\u00fdrikerfi\u00f0 ekki teki\u00f0 skyndimynd af b\u00e1\u00f0um diskum \u00e1 n\u00e1kv\u00e6mlega s\u00f6mu \u00f6rsek\u00fandu. Ef skyndimynd WAL-disksins er tekin jafnvel broti \u00far sek\u00fandu \u00e1 eftir skyndimynd gagnadisksins, getur gagnagrunnurinn ekki samr\u00e6mt ra\u00f0n\u00famerin vi\u00f0 endurheimt, sem lei\u00f0ir til banv\u00e6nnar gagnaspillingar.<\/p>\n

    \u201eVM Stun\u201c-\u00e1hrifin \u00e1 kerfi me\u00f0 mikla umfer\u00f0<\/h3>\n

    Ferli\u00f0 vi\u00f0 a\u00f0 b\u00faa til skyndimynd \u2014 og enn mikilv\u00e6gara, ferli\u00f0 vi\u00f0 a\u00f0 sameina hana \u2014 veldur fyrirb\u00e6ri sem kallast \u201eVM Stun\u201c (frysting s\u00fdndarv\u00e9lar).<\/p>\n

    Til a\u00f0 skipta I\/O-umfer\u00f0 \u00e1 \u00f6ruggan h\u00e1tt fr\u00e1 grunndiski yfir \u00e1 mismunadisk ver\u00f0ur s\u00fdndarv\u00e9last\u00fdrikerfi\u00f0 a\u00f0 gera stutt hl\u00e9 (frysta) \u00e1 s\u00fdndarv\u00e9linni. Fyrir l\u00e9tt hla\u00f0inn vef\u00fej\u00f3n g\u00e6ti \u00feessi frysting vara\u00f0 \u00ed 10-50 millisek\u00fandur og fari\u00f0 fram hj\u00e1 notendum. Hins vegar, fyrir gagnagrunn me\u00f0 mikla umfer\u00f0 og gr\u00ed\u00f0arlegt I\/O-\u00e1lag, getur sameining st\u00f3rs mismunadisks fryst s\u00fdndarv\u00e9lina \u00ed nokkrar sek\u00fandur.<\/p>\n

    Me\u00f0an \u00e1 frystingu stendur:
    \n* Nettengingar rofna, sem veldur t\u00edmam\u00f6rkum (timeouts) \u00ed forritum.
    \n* H\u00e1tilt\u00e6k klasakerfi (eins og SQL Server Always On, PostgreSQL Patroni e\u00f0a MySQL Galera) missa af hjartsl\u00e1ttarathugunum.
    \n* Klasinn g\u00e6ti haldi\u00f0 a\u00f0 frysti hn\u00faturinn s\u00e9 dau\u00f0ur, sem kallar fram \u00f3\u00fearfa og truflandi yfirf\u00e6rslu (failover) (split-brain atbur\u00f0ar\u00e1s).<\/p>\n

    Rifnar s\u00ed\u00f0ur (Torn Pages) og I\/O-misr\u00e6mi<\/h3>\n

    Gagnagrunnsv\u00e9lar skrifa venjulega g\u00f6gn \u00ed \u00e1kve\u00f0num s\u00ed\u00f0ust\u00e6r\u00f0um (t.d. 8KB fyrir PostgreSQL og SQL Server, 16KB fyrir InnoDB). Hins vegar vinnur undirliggjandi st\u00fdrikerfi og geymslukerfi \u00far I\/O \u00ed minni einingum (t.d. 4KB e\u00f0a 512 b\u00e6ti).<\/p>\n

    Ef s\u00fdndarv\u00e9last\u00fdrikerfi tekur skyndimynd n\u00e1kv\u00e6mlega \u00e1 me\u00f0an gagnagrunnurinn er a\u00f0 skrifa 8KB s\u00ed\u00f0u, g\u00e6ti skyndimyndin fanga\u00f0 fyrstu 4KB af n\u00fdju g\u00f6gnunum og s\u00ed\u00f0ustu 4KB af g\u00f6mlu g\u00f6gnunum. \u00deetta skapar rifna s\u00ed\u00f0u<\/strong>. \u00deegar \u00fe\u00fa reynir a\u00f0 endurheimta skyndimyndina mun gagnagrunnurinn lesa s\u00ed\u00f0una, mistakast vi\u00f0 sta\u00f0festingu \u00e1 eftirlitssummu (checksum) og merkja gagnagrunninn sem skemmdan.<\/p>\n

    Raunverulegar aflei\u00f0ingar fyrir tilteknar gagnagrunnsv\u00e9lar<\/h2>\n

    Mismunandi gagnagrunnsv\u00e9lar breg\u00f0ast vi\u00f0 \u201ecrash-consistent\u201c skyndimyndum \u00e1 \u00fdmsa vegu, en engin \u00feeirra h\u00f6ndlar \u00fea\u00f0 vel \u00ed framlei\u00f0sluumhverfi.<\/p>\n

      \n
    • PostgreSQL:<\/strong> PostgreSQL rei\u00f0ir sig miki\u00f0 \u00e1 pg_wal<\/code> m\u00f6ppuna. Ef skyndimynd fangar gagnam\u00f6ppuna ($PGDATA<\/code>) og WAL-ann\u00e1lana \u00far takti, mun PostgreSQL ekki r\u00e6sast og kasta villunni PANIC: could not locate a valid checkpoint record<\/code>.<\/li>\n
    • MySQL\/InnoDB:<\/strong> InnoDB notar tv\u00f6faldan skrif-bi\u00f0minni (doublewrite buffer) til a\u00f0 koma \u00ed veg fyrir rifnar s\u00ed\u00f0ur, sem b\u00fd\u00f0ur upp \u00e1 einhverja v\u00f6rn gegn \u201ecrash-consistent\u201c \u00e1standi. Hins vegar, ef ibdata1<\/code> skr\u00e1in og ib_logfile<\/code> eru fanga\u00f0ar \u00far takti, mun InnoDB-v\u00e9lin hrynja vi\u00f0 endurheimt.<\/li>\n
    • Microsoft SQL Server:<\/strong> SQL Server er mj\u00f6g vi\u00f0kv\u00e6mur fyrir frystingu \u00e1 I\/O. \u00c1n r\u00e9ttrar VSS (Volume Shadow Copy Service) sam\u00fe\u00e6ttingar mun endurheimt \u00e1 SQL Server \u00far sta\u00f0la\u00f0ri skyndimynd oft lei\u00f0a til \u00feess a\u00f0 gagnagrunnar ver\u00f0a merktir sem \u201esuspect\u201c og ann\u00e1lake\u00f0jur rofna, sem ey\u00f0ileggur m\u00f6guleika \u00fe\u00edna \u00e1 endurheimt a\u00f0 tilteknum t\u00edmapunkti (PITR).<\/li>\n<\/ul>\n

      Bestu starfsvenjur fyrir \u00f6rugga afritun s\u00fdndra gagnagrunna<\/h2>\n

      Til a\u00f0 vernda gagnagrunna sem byggja \u00e1 f\u00e6rslum ver\u00f0ur \u00fe\u00fa a\u00f0 fara fr\u00e1 \u201ecrash-consistent\u201c afritum yfir \u00ed \u201eapplication-consistent\u201c<\/strong> (forritssamr\u00e6md) afrit. \u00deetta krefst \u00feess a\u00f0 afritunarb\u00fana\u00f0urinn eigi samskipti vi\u00f0 gagnagrunnsv\u00e9lina, ney\u00f0i hana til a\u00f0 skola vinnsluminni yfir \u00e1 disk og gera hl\u00e9 \u00e1 I\/O-a\u00f0ger\u00f0um augnablik \u00e1 me\u00f0an skyndimyndin er tekin.<\/p>\n

      1. N\u00fdttu forritssamr\u00e6mda frystingu (VSS og fsfreeze)<\/h3>\n

      Fyrir Windows (SQL Server):<\/strong>
      \nGakktu alltaf \u00far skugga um a\u00f0 afritunarlausnin \u00fe\u00edn noti Microsoft Volume Shadow Copy Service (VSS). \u00deegar VSS-samh\u00e6ft afrit er r\u00e6st, frystir SQL Server VSS Writer I\/O-a\u00f0ger\u00f0ir gagnagrunnsins, skolar bi\u00f0f\u00e6rslum yfir \u00e1 disk og tryggir a\u00f0 skyndimyndin s\u00e9 fullkomlega forritssamr\u00e6md.<\/p>\n

      Fyrir Linux (PostgreSQL \/ MySQL):<\/strong>
      \nLinux hefur ekki innbygg\u00f0an valkost vi\u00f0 VSS. Til a\u00f0 n\u00e1 forritssamr\u00e6mi ver\u00f0ur \u00fe\u00fa a\u00f0 nota \u201epre-freeze\u201c og \u201epost-thaw\u201c skriftur \u00ed tengslum vi\u00f0 gestaverkf\u00e6ri s\u00fdndarv\u00e9last\u00fdrikerfisins (t.d. VMware Tools).<\/p>\n

      H\u00e9r er d\u00e6mi um VMware pre-freeze-script<\/code> fyrir PostgreSQL 15+ sem undirb\u00fdr gagnagrunninn \u00e1 \u00f6ruggan h\u00e1tt fyrir skyndimynd:<\/p>\n

      #!\/bin\/bash\n# \/usr\/sbin\/pre-freeze-script\n# Gakktu \u00far skugga um a\u00f0 \u00feessi skrifta s\u00e9 keyranleg (chmod +x)\n\n# 1. Seg\u00f0u PostgreSQL a\u00f0 undirb\u00faa sig fyrir afritun\nsu - postgres -c \"psql -c \"SELECT pg_backup_start('vm_snapshot', true);\"\"\n\n# 2. Skola\u00f0u bi\u00f0minni skr\u00e1arkerfisins yfir \u00e1 disk\nsync\n\n# 3. Frystu skr\u00e1arkerfi\u00f0 (a\u00f0 \u00fev\u00ed gefnu a\u00f0 g\u00f6gnin s\u00e9u \u00e1 \/var\/lib\/pgsql)\nfsfreeze -f \/var\/lib\/pgsql\n<\/code><\/pre>\n
      Og samsvarandi post-thaw-script<\/code> til a\u00f0 halda \u00e1fram starfsemi:<\/p>\n
      #!\/bin\/bash\n# \/usr\/sbin\/post-thaw-script\n\n# 1. Af-frystu skr\u00e1arkerfi\u00f0\nfsfreeze -u \/var\/lib\/pgsql\n\n# 2. Seg\u00f0u PostgreSQL a\u00f0 afritun s\u00e9 loki\u00f0\nsu - postgres -c \"psql -c \"SELECT pg_backup_stop();\"\"\n<\/code><\/pre>\n
      2. Nota\u00f0u innbygg\u00f0 afritunarverkf\u00e6ri gagnagrunna<\/h3>\n
      \u00de\u00f3tt forritssamr\u00e6mdar skyndimyndir s\u00e9u betri en sta\u00f0la\u00f0ar skyndimyndir, bera \u00fe\u00e6r samt me\u00f0 s\u00e9r h\u00e6ttu \u00e1 \u201eVM stun\u201c. \u00d6ruggasta lei\u00f0in fyrir afritun gagnagrunna er a\u00f0 nota innbygg\u00f0, streymandi afritunarverkf\u00e6ri sem starfa \u00f3h\u00e1\u00f0 s\u00fdndarv\u00e9last\u00fdrikerfinu.<\/p>\n
      PostgreSQL (pg_basebackup):<\/strong><\/p>\n
      pg_basebackup -h localhost -U replication_user -D \/mnt\/backups\/pg_backup -Ft -z -P\n<\/code><\/pre>\n
      MySQL\/MariaDB (Percona XtraBackup \/ Mariabackup):<\/strong>
      \n\u00deessi verkf\u00e6ri taka \u201ehot\u201c, \u00f3hindrandi afrit me\u00f0 \u00fev\u00ed a\u00f0 afrita gagnaskr\u00e1rnar og fylgjast samt\u00edmis me\u00f0 breytingum \u00ed redo-ann\u00e1lnum.<\/p>\n
      mariabackup --backup --target-dir=\/mnt\/backups\/mysql_backup --user=root --password=SecurePass\n<\/code><\/pre>\n
      SQL Server (T-SQL):<\/strong><\/p>\n
      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
      3. Innlei\u00f0a endurheimt a\u00f0 tilteknum t\u00edmapunkti (PITR) me\u00f0 ann\u00e1la-ark\u00edveringu<\/h3>\n
      Dagleg skyndimynd e\u00f0a fullt afrit verndar \u00feig a\u00f0eins fram a\u00f0 \u00feeirri m\u00edn\u00fatu sem \u00fea\u00f0 var teki\u00f0. Ef gagnagrunnurinn hrynur kl. 16:00 og s\u00ed\u00f0asta skyndimynd var kl. 02:00, tapar \u00fe\u00fa 14 klukkustundum af f\u00e6rslug\u00f6gnum.<\/p>\n
      Til a\u00f0 n\u00e1 raunverulegu vi\u00f0skipta\u00feoli ver\u00f0ur \u00fe\u00fa a\u00f0 sameina full forritssamr\u00e6md afrit og samfellda ann\u00e1la-ark\u00edveringu (afritun \u00e1 WAL, Redo-ann\u00e1lum e\u00f0a f\u00e6rsluann\u00e1lum \u00e1 nokkurra m\u00edn\u00fatna fresti). \u00deetta gerir gagnagrunnsstj\u00f3rum kleift a\u00f0 endurheimta gagnagrunninn a\u00f0 tiltekinni m\u00edn\u00fatu e\u00f0a jafnvel tilteknu f\u00e6rslun\u00fameri fyrir hamfarir.<\/p>\n
      Afritunarstefnur fyrirt\u00e6kja me\u00f0 CloudSave<\/h2>\n
      A\u00f0 st\u00fdra s\u00e9rsni\u00f0num \u201epre-freeze\u201c-skriftum, cron-verkefnum fyrir innbygg\u00f0 afrit og ann\u00e1lasendingum yfir tugi gagnagrunns\u00fej\u00f3na er rekstrarlegur martr\u00f6\u00f0 fyrir DevOps-teymi. \u00deetta er \u00fear sem fyrirt\u00e6kjalausn eins og CloudSave ver\u00f0ur mikilv\u00e6g.<\/p>\n
      CloudSave br\u00faar bili\u00f0 milli s\u00fdndarv\u00e6\u00f0ingar og gagnagrunnsarkitekt\u00fars. \u00cd sta\u00f0 \u00feess a\u00f0 treysta \u00e1 blindar skyndimyndir s\u00fdndarv\u00e9last\u00fdrikerfa, notar CloudSave forritssamr\u00e6mda umbo\u00f0smenn (agents) sem sam\u00fe\u00e6ttast innbyggt vi\u00f0 SQL Server, PostgreSQL, MySQL og Oracle.<\/p>\n
      \u00deegar CloudSave r\u00e6sir afritun:
      \n1. \u00c1 \u00fea\u00f0 samskipti beint vi\u00f0 gagnagrunnsv\u00e9lina \u00ed gegnum innbygg\u00f0 API (eins og VSS fyrir Windows e\u00f0a innbyggt WAL-streymi fyrir Linux).
      \n2. \u00dea\u00f0 skipuleggur skolun \u00e1 vinnsluminni yfir \u00e1 disk \u00e1n \u00feess a\u00f0 valda truflandi frystingu \u00e1 s\u00fdndarv\u00e9linni.
      \n3. \u00dea\u00f0 fangar gagnaskr\u00e1rnar \u00e1 \u00f6ruggan h\u00e1tt og st\u00fdrir sj\u00e1lfkrafa styttingu f\u00e6rsluann\u00e1la.
      \n4. \u00dea\u00f0 afritar f\u00e6rsluann\u00e1la st\u00f6\u00f0ugt, sem gerir kleift a\u00f0 endurheimta g\u00f6gn a\u00f0 tilteknum t\u00edmapunkti (PITR) me\u00f0 \u00f6rf\u00e1um smellum.<\/p>\n
      Me\u00f0 \u00fev\u00ed a\u00f0 f\u00e6ra fl\u00e6kjustigi\u00f0 vi\u00f0 forritssamr\u00e6mi yfir \u00e1 CloudSave geta gagnagrunnsstj\u00f3rar og kerfisstj\u00f3rar tryggt heilleika gagna \u00e1n \u00feess a\u00f0 f\u00f3rna afk\u00f6stum e\u00f0a tilt\u00e6kileika framlei\u00f0sluklasanna sinna.<\/p>\n
      Ni\u00f0ursta\u00f0a<\/h2>\n
      Skyndimyndir s\u00fdndarv\u00e9la eru \u00f3tr\u00falegt t\u00e6ki fyrir innvi\u00f0astj\u00f3rnun, en \u00fe\u00e6r eru \u00ed grundvallaratri\u00f0um \u00f3samr\u00fdmanlegar ACID-kr\u00f6fum gagnagrunna sem byggja \u00e1 f\u00e6rslum. A\u00f0 treysta \u00e1 \u201ecrash-consistent\u201c skyndimyndir s\u00fdndarv\u00e9last\u00fdrikerfa \u00fatsetur fyrirt\u00e6ki\u00f0 \u00feitt fyrir rifnum s\u00ed\u00f0um, rofnum afritunarke\u00f0jum og h\u00f6rmulegu gagnatapi.<\/p>\n
      Til a\u00f0 vernda mikilv\u00e6g g\u00f6gn \u00fe\u00edn ver\u00f0ur \u00fe\u00fa a\u00f0 innlei\u00f0a forritssamr\u00e6mda frystingu, nota innbygg\u00f0ar afritunara\u00f0fer\u00f0ir gagnagrunna og vi\u00f0halda samfelldum ann\u00e1lum af f\u00e6rslum. Me\u00f0 \u00fev\u00ed a\u00f0 tileinka \u00fe\u00e9r s\u00e9rh\u00e6f\u00f0ar afritunarlausnir fyrir fyrirt\u00e6ki getur\u00f0u tryggt a\u00f0 gagnagrunnar \u00fe\u00ednir haldist tilt\u00e6kir, fullkomlega endurheimtanlegir og algj\u00f6rlega \u00f6ruggir.<\/p>\n","protected":false},"excerpt":{"rendered":"
      > 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. 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