{"id":4458,"date":"2026-06-14T19:31:12","date_gmt":"2026-06-14T19:31:12","guid":{"rendered":"https:\/\/cloudsave.app\/?p=4458"},"modified":"2026-06-15T14:21:48","modified_gmt":"2026-06-15T14:21:48","slug":"af-hverju-mysqldump-bregst-st%c3%b3rum-mysql-gagnagrunnum-og-hvernig-%c3%a1-a%c3%b0-laga-%c3%bea%c3%b0","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/is\/knowledge-base\/af-hverju-mysqldump-bregst-st%c3%b3rum-mysql-gagnagrunnum-og-hvernig-%c3%a1-a%c3%b0-laga-%c3%bea%c3%b0\/","title":{"rendered":"Af hverju mysqldump bregst st\u00f3rum MySQL gagnagrunnum (og hvernig \u00e1 a\u00f0 laga \u00fea\u00f0)"},"content":{"rendered":"

\u00cd \u00e1ratugi hefur mysqldump<\/code> veri\u00f0 \u00f3umdeildur \u201esvissneskur herhn\u00edfur\u201c fyrir afritun \u00e1 MySQL gagnagrunnum. Hann er alls sta\u00f0ar, einfaldur \u00ed notkun og fylgir me\u00f0 hverri MySQL og MariaDB dreifingu. Fyrir litla og me\u00f0alst\u00f3ra gagnagrunna virkar hann \u00e1g\u00e6tlega.<\/p>\n

Hins vegar, eftir \u00fev\u00ed sem fyrirt\u00e6ki st\u00e6kka og gagnamagn fer yfir 100GB, 500GB e\u00f0a m\u00f6rg terab\u00e6t, breytist trausti\u00f0 \u00e1 mysqldump<\/code> \u00far g\u00f3\u00f0ri starfsvenju \u00ed alvarlegan veikleika \u00ed arkitekt\u00farnum. Ef \u00fe\u00fa ert gagnagrunnsstj\u00f3ri (DBA) e\u00f0a DevOps verkfr\u00e6\u00f0ingur sem st\u00fdrir st\u00f3rum framlei\u00f0slugagnagrunnum, hefur\u00f0u l\u00edklega upplifa\u00f0 hlj\u00f3\u00f0l\u00e1tar bilanir, afkastaminnkun \u00ed framlei\u00f0slu og \u00f3vi\u00f0unandi endurheimtart\u00edma (Recovery Time Objectives – RTO) sem fylgja r\u00f6klegum (logical) afritum.<\/p>\n

\u00cd \u00feessari grein munum vi\u00f0 greina arkitekt\u00farlegar takmarkanir mysqldump<\/code>, sko\u00f0a hvers vegna hann bregst vi\u00f0 st\u00e6kkun og \u00fatsk\u00fdra hvernig \u00e1 a\u00f0 innlei\u00f0a l\u00edkamlegar (physical) afritunara\u00f0fer\u00f0ir \u00e1 fyrirt\u00e6kisstigi til a\u00f0 vernda mikilv\u00e6g g\u00f6gn.<\/p>\n

Arkitekt\u00farlegar takmarkanir mysqldump<\/h2>\n

Til a\u00f0 skilja hvers vegna mysqldump<\/code> bregst vi\u00f0 st\u00e6kkun ver\u00f0um vi\u00f0 a\u00f0 sko\u00f0a hvernig hann virkar undir h\u00faddinu. mysqldump<\/code> framkv\u00e6mir r\u00f6kleg afrit<\/strong>. Hann sendir fyrirspurnir \u00e1 gagnagrunnsv\u00e9lina, les g\u00f6gnin og \u00fe\u00fd\u00f0ir \u00feau yfir \u00ed r\u00f6\u00f0 af SQL skipunum (a\u00f0allega CREATE TABLE<\/code> og INSERT INTO<\/code>).<\/p>\n

\u00de\u00f3 a\u00f0 \u00feetta skapi mj\u00f6g flytjanlega skr\u00e1 sem h\u00e6gt er a\u00f0 lesa af m\u00f6nnum, veldur \u00fea\u00f0 alvarlegum fl\u00f6skuh\u00e1lsum \u00ed umhverfi me\u00f0 mikla afk\u00f6st.<\/p>\n

1. Ein\u00fer\u00e1\u00f0a fl\u00f6skuh\u00e1lsinn<\/h3>\n

mysqldump<\/code> er hanna\u00f0ur sem ein\u00fer\u00e1\u00f0a (single-threaded) ferli. Hann vinnur eina t\u00f6flu \u00ed einu, r\u00f6\u00f0 fyrir r\u00f6\u00f0. \u00de\u00f3 a\u00f0 n\u00fat\u00edma v\u00e9lb\u00fana\u00f0ur st\u00e1ti af tugum \u00f6rgj\u00f6rvakjarna og NVMe-geymslum sem geta skila\u00f0 g\u00edgab\u00e6tum \u00e1 sek\u00fandu, n\u00fdtir mysqldump<\/code> a\u00f0eins brot af \u00feessum au\u00f0lindum.<\/p>\n

Jafnvel \u00feegar nota\u00f0ir eru sta\u00f0la\u00f0ir f\u00e1nar fyrir InnoDB t\u00f6flur:<\/p>\n

mysqldump -u root -p --single-transaction --routines --triggers --events --quick production_db > backup.sql\n<\/code><\/pre>\n
--quick<\/code> f\u00e1ninn ney\u00f0ir mysqldump<\/code> til a\u00f0 s\u00e6kja ra\u00f0ir eina af annarri \u00ed sta\u00f0 \u00feess a\u00f0 geyma alla t\u00f6fluna \u00ed minni, sem kemur \u00ed veg fyrir \u201eOut of Memory\u201c (OOM) villur hj\u00e1 vi\u00f0skiptavininum. Hins vegar \u00fe\u00fd\u00f0ir ein\u00fer\u00e1\u00f0a e\u00f0li\u00f0 a\u00f0 500GB gagnagrunnur g\u00e6ti teki\u00f0 10 til 15 klukkustundir a\u00f0 afrita, sem hefur alvarleg \u00e1hrif \u00e1 endurheimtarmarkmi\u00f0 (Recovery Point Objective – RPO).<\/p>\n
2. Mengun \u00e1 InnoDB bi\u00f0minni (Buffer Pool)<\/h3>\n
\u00deegar mysqldump<\/code> les hverja r\u00f6\u00f0 \u00ed hverri t\u00f6flu, ney\u00f0ir hann MySQL v\u00e9lina til a\u00f0 hla\u00f0a g\u00f6gnunum af disknum yfir \u00ed InnoDB bi\u00f0minni\u00f0. \u00cd framlei\u00f0sluumhverfi er bi\u00f0minni\u00f0 vandlega fyllt me\u00f0 \u201eheitum\u201c g\u00f6gnum sem veri\u00f0 er a\u00f0 vinna me\u00f0.<\/p>\n
St\u00f3rt r\u00f6klegt afrit mun hreinsa bi\u00f0minni\u00f0 og henda \u00fat v\u00edsunum og gagnas\u00ed\u00f0um sem oft er veri\u00f0 a\u00f0 nota til a\u00f0 r\u00fdma fyrir k\u00f6ldum g\u00f6gnum sem veri\u00f0 er a\u00f0 afrita. \u00deetta lei\u00f0ir til skyndilegrar og mikillar aukningar \u00e1 diskales\/skrifum (I\/O) \u00fear sem framlei\u00f0slufyrirspurnir ney\u00f0ast til a\u00f0 lesa af disknum, sem lei\u00f0ir til alvarlegrar tafar \u00ed forritum.<\/p>\n
3. Metadata l\u00e6singar og DDL \u00e1rekstrar<\/h3>\n
Til a\u00f0 vi\u00f0halda samr\u00e6mi treysta DBA-ar \u00e1 --single-transaction<\/code> f\u00e1nann, sem stillir einangrunarstig vi\u00f0skipta \u00e1 REPEATABLE READ<\/code> og byrjar vi\u00f0skipti \u00e1\u00f0ur en g\u00f6gn eru afritu\u00f0.<\/p>\n
\u00de\u00f3 a\u00f0 \u00feetta komi \u00ed veg fyrir l\u00e6singar \u00e1 t\u00f6flustigi (FLUSH TABLES WITH READ LOCK<\/code>), verndar \u00fea\u00f0 ekki gegn breytingum \u00e1 gagnaskilgreiningarm\u00e1li (DDL). Ef ALTER TABLE<\/code>, DROP TABLE<\/code> e\u00f0a TRUNCATE TABLE<\/code> skipun er keyr\u00f0 \u00e1 t\u00f6flu \u00e1 me\u00f0an mysqldump<\/code> er \u00ed gangi, mun afritunin hrynja me\u00f0 villunni table definition has changed, please retry transaction<\/code>. \u00cd CI\/CD umhverfi me\u00f0 t\u00ed\u00f0um breytingum \u00e1 gagnagrunnsskipulagi veldur \u00feetta st\u00f6\u00f0ugum bilunum \u00ed afritun.<\/p>\n
4. RTO martr\u00f6\u00f0in: Endurheimtart\u00edmi<\/h3>\n
Versta bilunin vi\u00f0 mysqldump<\/code> kemur ekki \u00ed lj\u00f3s vi\u00f0 afritunina, heldur vi\u00f0 endurheimtina.<\/p>\n
Endurheimt \u00e1 r\u00f6klega afritinu krefst \u00feess a\u00f0 MySQL v\u00e9lin greini og keyri millj\u00f3nir INSERT<\/code> skipana. Fyrir hverja r\u00f6\u00f0 sem sett er inn ver\u00f0ur MySQL a\u00f0:
\n* Athuga skor\u00f0ur (Foreign Keys, Unique Keys).
\n* Endurbyggja aukav\u00edsa (secondary indexes) \u00e1 flugi.
\n* Skrifa \u00ed InnoDB redo log.
\n* Skrifa \u00ed binlog (ef \u00fea\u00f0 er virkt).<\/p>\n
Endurheimt \u00e1 1TB gagnagrunni \u00far r\u00f6klega afriti getur teki\u00f0 nokkra daga. Ef fyrirt\u00e6ki\u00f0 \u00feitt hefur RTO upp \u00e1 4 klukkustundir, tryggir mysqldump<\/code> a\u00f0 \u00fe\u00fa munir brj\u00f3ta \u00fej\u00f3nustusamninginn (SLA).<\/p>\n
Valkostir \u00e1 fyrirt\u00e6kisstigi: Skipt yfir \u00ed l\u00edkamleg afrit<\/h2>\n
Til a\u00f0 n\u00e1 hr\u00f6\u00f0um afritum og endurheimtum fyrir st\u00f3r gagnas\u00f6fn ver\u00f0ur \u00fe\u00fa a\u00f0 yfirgefa r\u00f6kleg afrit og nota l\u00edkamleg afrit<\/strong>.<\/p>\n
L\u00edkamleg afrit fara framhj\u00e1 SQL-v\u00e9l MySQL algj\u00f6rlega. \u00cd sta\u00f0inn afrita \u00feau undirliggjandi tv\u00edundargagnaskr\u00e1r (.ibd<\/code> skr\u00e1r, redo logs og undo logs) beint af skr\u00e1arkerfinu. \u00dear sem \u00feau eru bara a\u00f0 afrita skr\u00e1r geta \u00feau starfa\u00f0 \u00e1 h\u00e1marks hra\u00f0a geymslub\u00fana\u00f0arins og h\u00e6gt er a\u00f0 samhli\u00f0a vinna \u00feau mj\u00f6g vel.<\/p>\n
Percona XtraBackup: I\u00f0na\u00f0arsta\u00f0allinn<\/h3>\n
Fyrir InnoDB og XtraDB v\u00e9lar er Percona XtraBackup<\/strong> fremsta opna l\u00edkamlega afritunart\u00f3li\u00f0. \u00dea\u00f0 framkv\u00e6mir \u201eheitar\u201c, \u00f3hindrandi afritanir af MySQL gagnagrunnum.<\/p>\n
Hvernig XtraBackup virkar<\/h4>\n
    \n
  1. Afritun gagna:<\/strong> XtraBackup byrjar a\u00f0 afrita InnoDB gagnaskr\u00e1rnar (.ibd<\/code>).<\/li>\n
  2. Log-rakning:<\/strong> \u00dear sem gagnagrunnurinn er virkur munu g\u00f6gn breytast \u00e1 me\u00f0an skr\u00e1rnar eru afrita\u00f0ar. XtraBackup r\u00e6sir bakgrunns\u00fer\u00e1\u00f0 sem fylgist me\u00f0 og afritar InnoDB redo log (ib_logfile0<\/code>, o.s.frv.) fyrir allar f\u00e6rslur sem eiga s\u00e9r sta\u00f0 \u00e1 me\u00f0an afritunin stendur yfir.<\/li>\n
  3. Undirb\u00faningur (Crash Recovery):<\/strong> Eftir afritunina eru afritu\u00f0u gagnaskr\u00e1rnar \u00ed \u00f3samr\u00e6mdu \u00e1standi. XtraBackup beitir afritu\u00f0u redo log-skr\u00e1num \u00e1 gagnaskr\u00e1rnar (svipa\u00f0 og MySQL gerir vi\u00f0 r\u00e6singu eftir hrun), sem lei\u00f0ir til fullkomlega samr\u00e6mdrar skyndimyndar af gagnagrunninum \u00e1 \u00fev\u00ed augnabliki sem afritunin lauk.<\/li>\n<\/ol>\n
    Innlei\u00f0ing \u00e1 l\u00edkamlegri afritunarstefnu<\/h2>\n
    H\u00e9r er t\u00e6knileg lei\u00f0beining um innlei\u00f0ingu \u00e1 l\u00edkamlegri afritunarstefnu me\u00f0 Percona XtraBackup.<\/p>\n
    Skref 1: Streymi afritunar<\/h3>\n
    A\u00f0 skrifa st\u00f3ra afritun \u00e1 sta\u00f0bundinn disk veldur oft vandr\u00e6\u00f0um me\u00f0 pl\u00e1ss. Besta starfsvenja er a\u00f0 streyma afrituninni beint \u00ed skjalasafnssni\u00f0, \u00fejappa \u00fev\u00ed og senda \u00e1 bi\u00f0sv\u00e6\u00f0i e\u00f0a beint \u00e1 afritunarvettvang.<\/p>\n
    Me\u00f0 \u00fev\u00ed a\u00f0 nota xbstream<\/code> getum vi\u00f0 samhli\u00f0a unni\u00f0 afritunina og \u00fejappa\u00f0 henni \u00e1 flugi:<\/p>\n
    xtrabackup --backup \n  --user=backup_user \n  --password=SecurePassword! \n  --parallel=4 \n  --stream=xbstream | lz4 > \/mnt\/backups\/mysql_prod_backup.xbstream.lz4\n<\/code><\/pre>\n
      \n
    • --parallel=4<\/code>: N\u00fdtir 4 \u00fer\u00e6\u00f0i til a\u00f0 lesa gagnaskr\u00e1r samhli\u00f0a.<\/li>\n
    • --stream=xbstream<\/code>: Skilar afrituninni \u00e1 s\u00e9rsni\u00f0nu streymissni\u00f0i Percona.<\/li>\n
    • lz4<\/code>: Veitir mj\u00f6g hra\u00f0a \u00fej\u00f6ppun me\u00f0 l\u00edtilli \u00f6rgj\u00f6rvanotkun.<\/li>\n<\/ul>\n
      Skref 2: Undirb\u00faningur afritunar fyrir endurheimt<\/h3>\n
      \u00c1\u00f0ur en h\u00e6gt er a\u00f0 endurheimta l\u00edkamlegt afrit ver\u00f0ur a\u00f0 \u201eundirb\u00faa\u201c \u00fea\u00f0 (beita redo logs). Fyrst skal af\u00fejappa streyminu:<\/p>\n
      mkdir -p \/data\/restore\nlz4 -d \/mnt\/backups\/mysql_prod_backup.xbstream.lz4 | xbstream -x -C \/data\/restore\n<\/code><\/pre>\n
      N\u00e6st skal keyra undirb\u00faningsfasann. \u00deetta skref krefst minnis, svo vertu viss um a\u00f0 \u00fej\u00f3nninn hafi n\u00e6gt vinnsluminni:<\/p>\n
      xtrabackup --prepare --use-memory=4G --target-dir=\/data\/restore\n<\/code><\/pre>\n
      Skref 3: Endurheimt gagnagrunnsins<\/h3>\n
      Til a\u00f0 endurheimta ver\u00f0ur MySQL gagnamappan a\u00f0 vera algj\u00f6rlega t\u00f3m. St\u00f6\u00f0va\u00f0u MySQL \u00fej\u00f3nustuna, hreinsa\u00f0u m\u00f6ppuna og afrita\u00f0u skr\u00e1rnar til baka:<\/p>\n
      systemctl stop mysql\nrm -rf \/var\/lib\/mysql\/*\n\nxtrabackup --copy-back --target-dir=\/data\/restore\n<\/code><\/pre>\n
      A\u00f0 lokum skaltu laga heimildir skr\u00e1arkerfisins \u00e1\u00f0ur en \u00fej\u00f3nustan er r\u00e6st:<\/p>\n
      chown -R mysql:mysql \/var\/lib\/mysql\nsystemctl start mysql\n<\/code><\/pre>\n
      \u00dear sem gagnaskr\u00e1rnar eru \u00feegar bygg\u00f0ar og v\u00edsar \u00feegar samsettir, r\u00e6sist gagnagrunnurinn strax. Endurheimt sem t\u00f3k 48 klukkustundir me\u00f0 mysqldump<\/code> tekur n\u00fa a\u00f0eins \u00feann t\u00edma sem \u00fea\u00f0 tekur a\u00f0 afrita skr\u00e1rnar yfir neti\u00f0 e\u00f0a diskinn \u2014 sem oft styttir RTO ni\u00f0ur \u00ed m\u00edn\u00fatur.<\/p>\n
      Bestun \u00e1 r\u00f6klegum endurheimtum (\u00feegar \u00fe\u00fa ver\u00f0ur a\u00f0 nota \u00fe\u00e6r)<\/h2>\n
      Ef \u00fe\u00fa ney\u00f0ist til a\u00f0 endurheimta st\u00f3rt r\u00f6klegt afrit (t.d. vi\u00f0 flutning \u00e1 milli mismunandi st\u00f3rra MySQL \u00fatg\u00e1fa e\u00f0a mismunandi \u00f6rgj\u00f6rvaarkitekt\u00fara \u00fear sem l\u00edkamlegar skr\u00e1r eru \u00f3samh\u00e6far), ver\u00f0ur \u00fe\u00fa a\u00f0 stilla MySQL stillingar t\u00edmabundi\u00f0 til a\u00f0 h\u00e1marka skrifhra\u00f0a.<\/p>\n
      Nota\u00f0u \u00feessar stillingar \u00ed my.cnf<\/code> \u00e1\u00f0ur en \u00fe\u00fa byrjar r\u00f6klegu endurheimtina:<\/p>\n
      [mysqld]\n# Sl\u00f6kkva t\u00edmabundi\u00f0 \u00e1 binlogging ef \u00feetta er sj\u00e1lfst\u00e6\u00f0 endurheimt\ndisable_log_bin\n\n# Seinka skrifum \u00e1 disk til a\u00f0 h\u00e1marka skrifhra\u00f0a\ninnodb_flush_log_at_trx_commit = 2\n\n# Auka bi\u00f0minni til a\u00f0 passa eins miki\u00f0 af vinnslumenginu og h\u00e6gt er\ninnodb_buffer_pool_size = <Setja \u00e1 70% af heildar vinnsluminni>\n\n# Auka st\u00e6r\u00f0 log-skr\u00e1a til a\u00f0 koma \u00ed veg fyrir \u00e1r\u00e1sargjarna checkpointing\ninnodb_log_file_size = 2G\n\n# Sl\u00f6kkva \u00e1 doublewrite buffer (\u00e1h\u00e6ttusamt fyrir framlei\u00f0slu, \u00f6ruggt fyrir fyrstu hle\u00f0slu)\ninnodb_doublewrite = 0\n<\/code><\/pre>\n
      Athugi\u00f0: F\u00e6r\u00f0u \u00feessar stillingar alltaf aftur \u00ed ACID-samh\u00e6f\u00f0ar sj\u00e1lfgefnar stillingar (innodb_flush_log_at_trx_commit = 1<\/code>, innodb_doublewrite = 1<\/code>) og endurr\u00e6stu MySQL \u00fej\u00f3nustuna \u00e1\u00f0ur en \u00fe\u00fa leyfir framlei\u00f0sluumfer\u00f0.<\/em><\/p>\n
      Sj\u00e1lfvirkni og \u00f6ryggi afritana me\u00f0 CloudSave<\/h2>\n
      \u00de\u00f3 a\u00f0 verkf\u00e6ri eins og Percona XtraBackup leysi t\u00e6knilega hli\u00f0ina \u00e1 \u00fev\u00ed a\u00f0 draga g\u00f6gn \u00fat \u00e1 skilvirkan h\u00e1tt, krefst raunveruleg hamfarabati \u00e1 fyrirt\u00e6kisstigi samh\u00e6fingar, \u00f6ruggrar geymslu utan sta\u00f0ar og l\u00edft\u00edmastj\u00f3rnunar. A\u00f0 treysta \u00e1 s\u00e9rsni\u00f0nar bash-skriftur og cron-verkefni til a\u00f0 st\u00fdra l\u00edkamlegum afritum skapar mikla h\u00e6ttu \u00e1 hlj\u00f3\u00f0l\u00e1tum bilunum og brotum \u00e1 reglum.<\/p>\n
      \u00deetta er \u00fear sem sam\u00fe\u00e6tting gagnagrunnslagsins vi\u00f0 fyrirt\u00e6kisvettvang eins og CloudSave<\/strong> ver\u00f0ur mikilv\u00e6g.<\/p>\n
      CloudSave br\u00faar bili\u00f0 \u00e1 milli hr\u00e1ra gagnagrunnsverkf\u00e6ra og fyrirt\u00e6kisreglna. Me\u00f0 \u00fev\u00ed a\u00f0 n\u00fdta for- og eftir-skriftarm\u00f6guleika CloudSave geta DevOps teymi r\u00e6st XtraBackup til a\u00f0 b\u00faa til samr\u00e6mda l\u00edkamlega skyndimynd. CloudSave tekur s\u00ed\u00f0an \u00f3a\u00f0finnanlega vi\u00f0 afritunarstraumnum, beitir AES-256 dulk\u00f3\u00f0un og fjarl\u00e6gir tv\u00edtekin g\u00f6gn (deduplication) \u00e1\u00f0ur en \u00feau eru afritu\u00f0 yfir \u00ed \u00f3breytanlega sk\u00fdjageymslu.<\/p>\n
      \u00deessi arkitekt\u00far tryggir a\u00f0:
      \n1. Afk\u00f6st framlei\u00f0slu haldast:<\/strong> Afritun keyrir \u00e1 hra\u00f0a geymslunnar \u00e1n \u00feess a\u00f0 menga InnoDB bi\u00f0minni\u00f0.
      \n2. V\u00f6rn gegn lausnarhugb\u00fana\u00f0i (Ransomware):<\/strong> \u00d3breytanlegar geymslustefnur innan CloudSave koma \u00ed veg fyrir a\u00f0 illgjarnir a\u00f0ilar ey\u00f0i e\u00f0a dulk\u00f3\u00f0i afrit af gagnagrunninum \u00fe\u00ednum.
      \n3. Sj\u00e1lfvirk var\u00f0veisla:<\/strong> GFS (Grandfather-Father-Son) var\u00f0veislustefnur eru me\u00f0h\u00f6ndla\u00f0ar sj\u00e1lfkrafa, sem tryggir samr\u00e6mi vi\u00f0 kr\u00f6fur um gagnasj\u00e1lfst\u00e6\u00f0i og endursko\u00f0un.
      \n4. Fyrirsj\u00e1anlegur RTO:<\/strong> \u00dear sem CloudSave st\u00fdrir l\u00edkamlegum skr\u00e1as\u00f6fnum er h\u00e6gt a\u00f0 skipuleggja endurheimt \u00e1 margra terab\u00e6ta gagnagrunni yfir \u00ed n\u00fdtt tilvik hratt, sem n\u00e6r str\u00f6ngum RTO-markmi\u00f0um.<\/p>\n
      Ni\u00f0ursta\u00f0a<\/h2>\n
      A\u00f0 halda \u00e1fram a\u00f0 nota mysqldump<\/code> fyrir st\u00f3ra gagnagrunna er fj\u00e1rh\u00e6ttuspil me\u00f0 uppit\u00edma og gagnaheilleika fyrirt\u00e6kisins. Ein\u00fer\u00e1\u00f0a e\u00f0li\u00f0, mengun \u00e1 bi\u00f0minni og h\u00f6rmulegur endurheimtart\u00edmi gera \u00fea\u00f0 \u00ed grundvallaratri\u00f0um \u00f3h\u00e6ft fyrir n\u00fat\u00edma umhverfi me\u00f0 mikla afk\u00f6st.<\/p>\n
      Me\u00f0 \u00fev\u00ed a\u00f0 skipta yfir \u00ed l\u00edkamleg afrit me\u00f0 verkf\u00e6rum eins og Percona XtraBackup, og skipuleggja l\u00edft\u00edma, dulk\u00f3\u00f0un og afritun utan sta\u00f0ar \u00ed gegnum \u00f6flugan vettvang eins og CloudSave, breytir\u00f0u afritunarstefnu gagnagrunnsins \u00far vi\u00f0kv\u00e6mri \u00e1h\u00e6ttu \u00ed \u00f6flugan eign \u00e1 fyrirt\u00e6kisstigi. Meti\u00f0 RTO og RPO m\u00e6likvar\u00f0a ykkar \u00ed dag \u2014 ef endurheimt tekur lengri t\u00edma en fyrirt\u00e6ki\u00f0 hefur efni \u00e1 a\u00f0 vera ni\u00f0ri, er kominn t\u00edmi til a\u00f0 skilja mysqldump<\/code> eftir.<\/p>\n","protected":false},"excerpt":{"rendered":"
      ** Discover why mysqldump fails large MySQL databases and learn how to implement enterprise-grade physical backups using Percona XtraBackup and CloudSave to drastically reduce your RTO.<\/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 mysqldump Fails Large MySQL Databases & How to Fix It","rank_math_description":"** Discover why mysqldump fails large MySQL databases and learn how to implement enterprise-grade physical backups using Percona XtraBackup and CloudSave to drastically reduce your RTO.","rank_math_focus_keyword":"mysqldump large databases","footnotes":""},"categories":[479],"tags":[2965,2966,2967,2968,2969,2617,2970],"class_list":["post-4458","post","type-post","status-publish","format-standard","hentry","category-database-backup","tag-database-scaling","tag-dba","tag-large-databases","tag-logical-dumps","tag-mysql-backup","tag-mysqldump","tag-rto"],"yoast_head":"\nWhy mysqldump Fails Large MySQL Databases & How to Fix It<\/title>\n<meta name=\"description\" content=\"** Discover why mysqldump fails large MySQL databases and learn how to implement enterprise-grade physical backups using Percona XtraBackup and CloudSave to drastically reduce your RTO.\" \/>\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\/is\/knowledge-base\/af-hverju-mysqldump-bregst-st%c3%b3rum-mysql-gagnagrunnum-og-hvernig-%c3%a1-a%c3%b0-laga-%c3%bea%c3%b0\/\" \/>\n<meta property=\"og:locale\" content=\"is_IS\" 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