{"id":38149,"date":"2026-01-24T13:00:38","date_gmt":"2026-01-24T10:00:38","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/aws-dms-migrasyonlarinda-karsilasilan-yaygin-sorunlar-ve-cozum-yollari\/"},"modified":"2026-01-24T13:00:38","modified_gmt":"2026-01-24T10:00:38","slug":"aws-dms-migrasyonlarinda-karsilasilan-yaygin-sorunlar-ve-cozum-yollari","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/aws-dms-migrasyonlarinda-karsilasilan-yaygin-sorunlar-ve-cozum-yollari\/","title":{"rendered":"AWS DMS Migrasyonlar\u0131nda Kar\u015f\u0131la\u015f\u0131lan Yayg\u0131n Sorunlar ve \u00c7\u00f6z\u00fcm Yollar\u0131"},"content":{"rendered":"<h2>AWS DMS Migrasyonlar\u0131nda Kar\u015f\u0131la\u015f\u0131lan Yayg\u0131n Sorunlar ve \u00c7\u00f6z\u00fcm Yollar\u0131<\/h2>\n<p>Bulut tabanl\u0131 \u00e7\u00f6z\u00fcmlere ge\u00e7i\u015f, modern i\u015fletmeler i\u00e7in ka\u00e7\u0131n\u0131lmaz bir ad\u0131md\u0131r ve AWS Database Migration Service (DMS), bu s\u00fcreci basitle\u015ftiren g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r. Ancak DMS, do\u011fru yap\u0131land\u0131r\u0131lmad\u0131\u011f\u0131nda \u00e7e\u015fitli zorluklar \u00e7\u0131karabilir. Bu makalede, AWS DMS migrasyonlar\u0131m\u0131z s\u0131ras\u0131nda kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z yayg\u0131n sorunlar\u0131, temel nedenlerini ve \u00e7\u00f6z\u00fcm yollar\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. Amac\u0131m\u0131z, kendi migrasyon s\u00fcre\u00e7lerinizde benzer engellerle kar\u015f\u0131la\u015fmaman\u0131z i\u00e7in size pratik bilgiler sunmakt\u0131r.<\/p>\n<h2>1. Replikasyon \u00d6rnekleri ve Endpoint Yap\u0131land\u0131rmas\u0131 Sorunlar\u0131<\/h2>\n<p>DMS migrasyonlar\u0131n\u0131n temel ta\u015flar\u0131ndan biri olan replikasyon \u00f6rnekleri (replication instances) ve u\u00e7 noktalar\u0131n (endpoints) do\u011fru yap\u0131land\u0131r\u0131lmas\u0131, sorunsuz bir ge\u00e7i\u015f i\u00e7in hayati \u00f6neme sahiptir. Yanl\u0131\u015f yap\u0131land\u0131rmalar, en s\u0131k kar\u015f\u0131la\u015f\u0131lan hatalar\u0131n ba\u015f\u0131nda gelir.<\/p>\n<h3>1.1. Endpoint Ba\u011flant\u0131 Hatalar\u0131<\/h3>\n<p>Kaynak veya hedef veritaban\u0131na ba\u011flanamama, DMS migrasyonlar\u0131n\u0131n ba\u015flang\u0131c\u0131nda kar\u015f\u0131la\u015f\u0131lan en yayg\u0131n sorundur. Bu genellikle yanl\u0131\u015f kimlik bilgileri, hatal\u0131 sunucu ad\u0131\/IP adresi veya port numaras\u0131 nedeniyle olu\u015fur. Endpoint&#8217;leri olu\u015ftururken, ba\u011flant\u0131 testlerini mutlaka yapmal\u0131s\u0131n\u0131z.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Endpoint yap\u0131land\u0131rmas\u0131ndaki kullan\u0131c\u0131 ad\u0131, parola, sunucu ad\u0131 ve port bilgilerini dikkatlice kontrol edin. \u00d6zellikle \u015fifrelerin do\u011fru girildi\u011finden emin olun. Kaynak ve hedef veritaban\u0131 loglar\u0131n\u0131 inceleyerek ba\u011flant\u0131 denemelerinin ula\u015f\u0131p ula\u015fmad\u0131\u011f\u0131n\u0131 kontrol etmek faydal\u0131 olacakt\u0131r.<\/li>\n<\/ul>\n<h3>1.2. Endpoint Kaynaklar\u0131 ve \u0130zinleri<\/h3>\n<p>DMS&#8217;in kaynak ve hedef veritabanlar\u0131na eri\u015febilmesi i\u00e7in yeterli izinlere sahip olmas\u0131 gerekir. \u00d6zellikle kaynak veritaban\u0131nda CDC (De\u011fi\u015fiklik Verisi Yakalama) i\u00e7in gerekli yetkilerin eksik olmas\u0131, migrasyonun ba\u015far\u0131s\u0131z olmas\u0131na yol a\u00e7ar.<\/p>\n<p>\u00d6rnek SQL \u0130zinleri (PostgreSQL i\u00e7in):<\/p>\n<pre><code class=\"language-sql\">\nGRANT USAGE ON SCHEMA public TO dms_user;\nGRANT SELECT ON ALL TABLES IN SCHEMA public TO dms_user;\nGRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO dms_user;\nALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO dms_user;\nALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON SEQUENCES TO dms_user;\n<\/pre>\n<p><\/code><\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> AWS DMS dok\u00fcmantasyonunda belirtilen minimum izinleri hem kaynak hem de hedef veritaban\u0131 kullan\u0131c\u0131s\u0131 i\u00e7in eksiksiz olarak tan\u0131mlay\u0131n. \u00d6zellikle CDC i\u00e7in gerekli olan replikasyon izinlerini (\u00f6rne\u011fin PostgreSQL i\u00e7in <code>rds_superuser<\/code> veya <code>REPLICATION<\/code> rol\u00fc) kontrol edin.<\/li>\n<\/ul>\n<h3>1.3. Replikasyon \u00d6rne\u011fi Boyutland\u0131rmas\u0131<\/h3>\n<p>Replikasyon \u00f6rne\u011finin (replication instance) yanl\u0131\u015f boyutland\u0131r\u0131lmas\u0131, performans sorunlar\u0131na veya migrasyonun durmas\u0131na neden olabilir. \u00c7ok k\u00fc\u00e7\u00fck bir \u00f6rnek, b\u00fcy\u00fck veri setlerini i\u015fleyemeyebilirken, \u00e7ok b\u00fcy\u00fck bir \u00f6rnek gereksiz maliyet yarat\u0131r.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Migre edilecek veri miktar\u0131, tablo say\u0131s\u0131 ve beklenen de\u011fi\u015fim h\u0131z\u0131 gibi fakt\u00f6rleri g\u00f6z \u00f6n\u00fcnde bulundurarak replikasyon \u00f6rne\u011fi boyutunu se\u00e7in. \u0130lk tam y\u00fckleme i\u00e7in daha b\u00fcy\u00fck bir \u00f6rnek (\u00f6rne\u011fin <code>dms.r5.large<\/code> veya <code>dms.r5.xlarge<\/code>) kullan\u0131p, CDC a\u015famas\u0131na ge\u00e7ildi\u011finde daha k\u00fc\u00e7\u00fck bir \u00f6rne\u011fe ge\u00e7i\u015f yapmay\u0131 d\u00fc\u015f\u00fcnebilirsiniz.<\/li>\n<\/ul>\n<h2>2. A\u011f ve G\u00fcvenlik Duvar\u0131 Engelleri<\/h2>\n<p>AWS DMS, bulut tabanl\u0131 bir hizmet oldu\u011fundan, kaynak ve hedef veritabanlar\u0131 ile aras\u0131ndaki a\u011f ba\u011flant\u0131s\u0131n\u0131n ve g\u00fcvenlik duvar\u0131 kurallar\u0131n\u0131n do\u011fru yap\u0131land\u0131r\u0131lmas\u0131 kritik \u00f6neme sahiptir. Bu, genellikle en \u00e7ok zaman harcanan hata ay\u0131klama alanlar\u0131ndan biridir.<\/p>\n<h3>2.1. VPC ve G\u00fcvenlik Grubu Yap\u0131land\u0131rmas\u0131<\/h3>\n<p>DMS replikasyon \u00f6rne\u011fi, genellikle bir VPC i\u00e7inde \u00e7al\u0131\u015f\u0131r ve kaynak\/hedef veritabanlar\u0131na eri\u015fimi g\u00fcvenlik gruplar\u0131 arac\u0131l\u0131\u011f\u0131yla sa\u011flan\u0131r. Yanl\u0131\u015f g\u00fcvenlik grubu kurallar\u0131, ba\u011flant\u0131 hatalar\u0131na yol a\u00e7ar.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> DMS replikasyon \u00f6rne\u011finin bulundu\u011fu g\u00fcvenlik grubundan, kaynak ve hedef veritabanlar\u0131n\u0131n dinledi\u011fi portlara (\u00f6rn. PostgreSQL i\u00e7in 5432, MySQL i\u00e7in 3306) giden trafi\u011fe izin veren kurallar ekleyin. Ayn\u0131 \u015fekilde, kaynak ve hedef veritabanlar\u0131n\u0131n g\u00fcvenlik gruplar\u0131na da DMS replikasyon \u00f6rne\u011finin IP aral\u0131\u011f\u0131ndan gelen trafi\u011fe izin veren kurallar eklenmelidir.<\/li>\n<\/ul>\n<h3>2.2. ACL ve Y\u00f6nlendirme Tablosu Sorunlar\u0131<\/h3>\n<p>Daha karma\u015f\u0131k a\u011f yap\u0131lar\u0131nda, A\u011f Eri\u015fim Kontrol Listeleri (NACL) ve VPC y\u00f6nlendirme tablolar\u0131 da DMS trafi\u011fini engelleyebilir. \u00d6zellikle farkl\u0131 VPC'ler veya \u015firket i\u00e7i a\u011flar aras\u0131nda ge\u00e7i\u015f yaparken bu sorunlar ortaya \u00e7\u0131kabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> NACL'lerin hem gelen hem de giden kurallar\u0131n\u0131 kontrol edin ve DMS replikasyon \u00f6rne\u011finin IP'sine ve veritaban\u0131 portlar\u0131na izin verdi\u011finden emin olun. Y\u00f6nlendirme tablolar\u0131n\u0131n, DMS \u00f6rne\u011finin ve veritabanlar\u0131n\u0131n bulundu\u011fu alt a\u011flar aras\u0131nda do\u011fru y\u00f6nlendirmeleri i\u00e7erdi\u011finden emin olun.<\/li>\n<\/ul>\n<h3>2.3. \u00d6zel Ba\u011flant\u0131 ve VPN \u0130htiya\u00e7lar\u0131<\/h3>\n<p>\u015eirket i\u00e7i (on-premise) veritabanlar\u0131ndan AWS'ye veya farkl\u0131 AWS hesaplar\u0131\/VPC'leri aras\u0131nda ge\u00e7i\u015f yaparken, Direct Connect, VPN veya VPC Peering gibi \u00f6zel ba\u011flant\u0131lar gerekebilir. Bu ba\u011flant\u0131lar\u0131n yanl\u0131\u015f yap\u0131land\u0131r\u0131lmas\u0131, eri\u015fim sorunlar\u0131na neden olur.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> \u0130lgili \u00f6zel ba\u011flant\u0131 hizmetlerinin (Direct Connect, VPN, VPC Peering) do\u011fru \u015fekilde yap\u0131land\u0131r\u0131ld\u0131\u011f\u0131ndan ve a\u011f trafi\u011fini DMS replikasyon \u00f6rne\u011fine ve veritabanlar\u0131na y\u00f6nlendirdi\u011finden emin olun. A\u011f uzmanlar\u0131n\u0131zla birlikte \u00e7al\u0131\u015farak ba\u011flant\u0131 testleri yap\u0131n.<\/li>\n<\/ul>\n<h2>3. Veri Tipi Uyu\u015fmazl\u0131klar\u0131 ve D\u00f6n\u00fc\u015f\u00fcm Hatalar\u0131<\/h2>\n<p>Farkl\u0131 veritaban\u0131 motorlar\u0131 aras\u0131nda ge\u00e7i\u015f yaparken, veri tiplerinin uyumlulu\u011fu \u00f6nemli bir fakt\u00f6rd\u00fcr. DMS, baz\u0131 otomatik d\u00f6n\u00fc\u015f\u00fcmler yapsa da, belirli senaryolarda manuel m\u00fcdahale veya \u00f6zel d\u00f6n\u00fc\u015f\u00fcm kurallar\u0131 gerekebilir.<\/p>\n<h3>3.1. Kaynak ve Hedef Veri Tipi Farkl\u0131l\u0131klar\u0131<\/h3>\n<p>\u00d6zellikle Oracle'dan PostgreSQL'e veya SQL Server'dan MySQL'e ge\u00e7i\u015f yaparken, veri tiplerinin birebir e\u015fle\u015fmemesi sorunlara yol a\u00e7ar. \u00d6rne\u011fin, Oracle'daki <code>NUMBER<\/code> tipi, PostgreSQL'de <code>NUMERIC<\/code> veya <code>DECIMAL<\/code> olarak e\u015fle\u015fmeyebilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> DMS g\u00f6revini olu\u015ftururken \"Transformation Rules\" (D\u00f6n\u00fc\u015f\u00fcm Kurallar\u0131) kullanarak belirli veri tiplerini hedef veritaban\u0131na uygun hale getirin. \u00d6rne\u011fin, <code>NUMBER(p,s)<\/code> tipini <code>NUMERIC(p,s)<\/code> olarak d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz. \u00d6nceden bir veri tipi e\u015fleme matrisi haz\u0131rlamak faydal\u0131 olacakt\u0131r.<\/li>\n<\/ul>\n<h3>3.2. LOB (Large Object) Veri \u0130\u015fleme<\/h3>\n<p>B\u00fcy\u00fck nesne (LOB) verileri (CLOB, BLOB gibi) DMS migrasyonlar\u0131nda \u00f6zel dikkat gerektirir. LOB boyutu s\u0131n\u0131rlar\u0131 veya yanl\u0131\u015f LOB modu ayarlar\u0131, veri kesilmesine veya migrasyon hatalar\u0131na neden olabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> DMS g\u00f6revi ayarlar\u0131nda LOB i\u015fleme modunu (Full LOB Mode, Limited LOB Mode) do\u011fru se\u00e7in. E\u011fer LOB boyutlar\u0131 hedef veritaban\u0131n\u0131n s\u0131n\u0131rlar\u0131n\u0131 a\u015f\u0131yorsa veya \u00e7ok b\u00fcy\u00fckse \"Full LOB Mode\" kullanmak daha g\u00fcvenli olabilir, ancak performans\u0131 d\u00fc\u015f\u00fcrebilir. \"Limited LOB Mode\" kullan\u0131yorsan\u0131z, maksimum LOB boyutunu dikkatlice ayarlay\u0131n.<\/li>\n<\/ul>\n<h3>3.3. Karakter Seti ve Kodlama Sorunlar\u0131<\/h3>\n<p>Farkl\u0131 karakter setleri (\u00f6rne\u011fin Latin1'den UTF-8'e) aras\u0131nda ge\u00e7i\u015f yaparken, veri bozulmalar\u0131 veya karakterlerin yanl\u0131\u015f g\u00f6sterilmesi gibi sorunlar ortaya \u00e7\u0131kabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Hedef veritaban\u0131n\u0131n karakter setinin, kaynak veritaban\u0131ndaki t\u00fcm karakterleri destekledi\u011finden emin olun. Genellikle UTF-8, en geni\u015f karakter deste\u011fini sa\u011flad\u0131\u011f\u0131 i\u00e7in tercih edilir. DMS g\u00f6rev ayarlar\u0131nda \"Extra Connection Attributes\" (Ek Ba\u011flant\u0131 Nitelikleri) kullanarak karakter seti d\u00f6n\u00fc\u015f\u00fcmlerini belirtebilirsiniz.<\/li>\n<\/ul>\n<h2>4. Performans Darbo\u011fazlar\u0131 ve Yava\u015f Replikasyon<\/h2>\n<p>DMS migrasyonlar\u0131, \u00f6zellikle b\u00fcy\u00fck veri setleri i\u00e7in zaman al\u0131c\u0131 olabilir. Performans darbo\u011fazlar\u0131, hem tam y\u00fckleme (full load) hem de CDC (de\u011fi\u015fiklik verisi yakalama) a\u015famalar\u0131nda ortaya \u00e7\u0131kabilir.<\/p>\n<h3>4.1. Replikasyon \u00d6rne\u011fi Kaynak Kullan\u0131m\u0131<\/h3>\n<p>Replikasyon \u00f6rne\u011finin CPU, bellek veya I\/O kaynaklar\u0131n\u0131n yetersiz kalmas\u0131, replikasyon h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde d\u00fc\u015f\u00fcr\u00fcr.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> AWS CloudWatch metriklerini kullanarak replikasyon \u00f6rne\u011finin CPU kullan\u0131m\u0131, bellek kullan\u0131m\u0131 ve I\/OPS de\u011ferlerini izleyin. E\u011fer kaynaklar s\u00fcrekli olarak y\u00fcksek seviyelerde seyrediyorsa, replikasyon \u00f6rne\u011fini daha b\u00fcy\u00fck bir boyuta y\u00fckseltmeyi d\u00fc\u015f\u00fcn\u00fcn.<\/li>\n<\/ul>\n<h3>4.2. Kaynak Veritaban\u0131 Y\u00fck\u00fc<\/h3>\n<p>DMS, kaynak veritaban\u0131ndan veri okurken, veritaban\u0131 \u00fczerinde ek bir y\u00fck olu\u015fturur. E\u011fer kaynak veritaban\u0131 zaten y\u00fcksek y\u00fcke sahipse, bu durum performans\u0131 daha da k\u00f6t\u00fcle\u015ftirebilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Migrasyonu yo\u011fun olmayan saatlerde planlay\u0131n. Kaynak veritaban\u0131n\u0131n performans\u0131n\u0131 izleyin ve gerekirse okuma replikalar\u0131 (read replicas) kullanarak DMS'in y\u00fck\u00fcn\u00fc da\u011f\u0131tmay\u0131 d\u00fc\u015f\u00fcn\u00fcn. DMS g\u00f6revi ayarlar\u0131nda \"Batch Apply\" boyutunu ayarlayarak kaynak \u00fczerindeki y\u00fck\u00fc optimize edebilirsiniz.<\/li>\n<\/ul>\n<h3>4.3. Hedef Veritaban\u0131 Yazma Performans\u0131<\/h3>\n<p>DMS, verileri hedef veritaban\u0131na yazarken, hedef veritaban\u0131n\u0131n yazma performans\u0131na ba\u011f\u0131ml\u0131d\u0131r. Yava\u015f disk I\/O'su veya yetersiz i\u015flem g\u00fcc\u00fc, darbo\u011fazlara neden olabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Hedef veritaban\u0131n\u0131n disk I\/OPS'unu ve i\u015flem g\u00fcc\u00fcn\u00fc kontrol edin. RDS kullan\u0131yorsan\u0131z, daha y\u00fcksek IOPS sa\u011flayan depolama tiplerine (\u00f6rne\u011fin Provisioned IOPS SSD) ge\u00e7meyi veya daha g\u00fc\u00e7l\u00fc bir veritaban\u0131 \u00f6rne\u011fi kullanmay\u0131 d\u00fc\u015f\u00fcnebilirsiniz. Ayr\u0131ca, hedef veritaban\u0131nda indekslerin veya tetikleyicilerin ge\u00e7ici olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131 (tam y\u00fckleme s\u0131ras\u0131nda) yazma performans\u0131n\u0131 art\u0131rabilir.<\/li>\n<\/ul>\n<h2>5. Tam Y\u00fckleme ve CDC (De\u011fi\u015fiklik Verisi Yakalama) Problemleri<\/h2>\n<p>DMS g\u00f6revleri, genellikle bir tam y\u00fckleme (full load) ve ard\u0131ndan CDC (de\u011fi\u015fiklik verisi yakalama) a\u015famas\u0131ndan olu\u015fur. Her iki a\u015famada da farkl\u0131 t\u00fcrde sorunlarla kar\u015f\u0131la\u015f\u0131labilir.<\/p>\n<h3>5.1. Tam Y\u00fckleme S\u0131ras\u0131nda Kilitlenmeler<\/h3>\n<p>B\u00fcy\u00fck tablolar\u0131n tam y\u00fcklemesi s\u0131ras\u0131nda, kaynak veritaban\u0131nda uzun s\u00fcreli kilitlenmeler veya performans d\u00fc\u015f\u00fc\u015fleri ya\u015fanabilir. Bu, \u00f6zellikle kaynak veritaban\u0131 \u00fczerinde aktif i\u015flem y\u00fck\u00fc varken kritik bir sorundur.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Tam y\u00fcklemeyi, sistemin en az yo\u011fun oldu\u011fu saatlerde planlay\u0131n. DMS g\u00f6rev ayarlar\u0131nda \"LOB Mode\" ve \"Batch Apply\" ayarlar\u0131n\u0131 optimize edin. Gerekirse, tablolar\u0131 gruplar halinde veya daha k\u00fc\u00e7\u00fck par\u00e7alar halinde migre etmeyi d\u00fc\u015f\u00fcnebilirsiniz.<\/li>\n<\/ul>\n<h3>5.2. CDC Ba\u015flatma ve S\u00fcreklilik Sorunlar\u0131<\/h3>\n<p>Tam y\u00fckleme tamamland\u0131ktan sonra CDC'nin ba\u015flamamas\u0131 veya kesintiye u\u011framas\u0131, veri tutars\u0131zl\u0131klar\u0131na yol a\u00e7ar. Bu genellikle kaynak veritaban\u0131ndaki CDC ayarlar\u0131 veya DMS'in log okuma yetenekleri ile ilgilidir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Kaynak veritaban\u0131nda CDC i\u00e7in gerekli t\u00fcm ayarlar\u0131n (\u00f6rne\u011fin PostgreSQL i\u00e7in <code>wal_level = logical<\/code>, SQL Server i\u00e7in Change Data Capture etkinle\u015ftirme) yap\u0131ld\u0131\u011f\u0131ndan emin olun. DMS g\u00f6rev loglar\u0131n\u0131 dikkatlice inceleyerek CDC'nin neden durdu\u011funu veya ba\u015flayamad\u0131\u011f\u0131n\u0131 tespit edin. Kaynak veritaban\u0131 loglar\u0131n\u0131 da kontrol edin.<\/li>\n<\/ul>\n<h3>5.3. \u0130\u015flem S\u0131ras\u0131 ve Tutarl\u0131l\u0131k<\/h3>\n<p>CDC s\u0131ras\u0131nda, i\u015flemlerin do\u011fru s\u0131rada ve tutarl\u0131 bir \u015fekilde hedef veritaban\u0131na uygulanmas\u0131 kritik \u00f6neme sahiptir. B\u00fcy\u00fck i\u015flemler veya uzun s\u00fcreli gecikmeler, tutars\u0131zl\u0131klara neden olabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> DMS, varsay\u0131lan olarak i\u015flem s\u0131ras\u0131n\u0131 korumaya \u00e7al\u0131\u015f\u0131r. Ancak, hedef veritaban\u0131ndaki k\u0131s\u0131tlamalar veya indeksler nedeniyle gecikmeler ya\u015fanabilir. Hedef veritaban\u0131nda tam y\u00fckleme s\u0131ras\u0131nda indeksleri ve k\u0131s\u0131tlamalar\u0131 devre d\u0131\u015f\u0131 b\u0131rak\u0131p, CDC ba\u015flad\u0131ktan sonra tekrar etkinle\u015ftirmeyi d\u00fc\u015f\u00fcnebilirsiniz.<\/li>\n<\/ul>\n<h2>6. Kesinti S\u00fcresi Y\u00f6netimi ve Ge\u00e7i\u015f Stratejileri<\/h2>\n<p>Veritaban\u0131 migrasyonlar\u0131 genellikle bir miktar kesinti s\u00fcresi gerektirir. Bu s\u00fcreyi minimize etmek ve ba\u015far\u0131l\u0131 bir ge\u00e7i\u015f sa\u011flamak i\u00e7in do\u011fru stratejiler belirlemek \u00e7ok \u00f6nemlidir.<\/p>\n<h3>6.1. Minimum Kesinti \u0130\u00e7in Stratejiler<\/h3>\n<p>Uygulamalar\u0131n canl\u0131 veritaban\u0131 \u00fczerinde \u00e7al\u0131\u015ft\u0131\u011f\u0131 durumlarda, kesinti s\u00fcresini en aza indirmek i\u00e7in \u00e7e\u015fitli stratejiler uygulanabilir.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b>\n<ol>\n<li><b>Kesintisiz Ge\u00e7i\u015f (Zero Downtime Migration):<\/b> DMS'in CDC \u00f6zelli\u011fini kullanarak kaynak ve hedef veritabanlar\u0131n\u0131 senkronize tutun. Uygulama ge\u00e7i\u015fini (cutover) planl\u0131 bir bak\u0131m penceresinde ger\u00e7ekle\u015ftirin.<\/li>\n<li><b>Okuma Replikas\u0131 Kullan\u0131m\u0131:<\/b> E\u011fer kaynak veritaban\u0131 bir okuma replikas\u0131 ise, DMS'i bu replika \u00fczerinden \u00e7al\u0131\u015ft\u0131rarak ana veritaban\u0131 \u00fczerindeki y\u00fck\u00fc azalt\u0131n.<\/li>\n<li><b>A\u015fama A\u015fama Ge\u00e7i\u015f:<\/b> B\u00fcy\u00fck ve karma\u015f\u0131k sistemler i\u00e7in, mod\u00fclleri veya servisleri a\u015fama a\u015fama yeni veritaban\u0131na ge\u00e7irin.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3>6.2. Test ve Do\u011frulama S\u00fcre\u00e7leri<\/h3>\n<p>Ge\u00e7i\u015f \u00f6ncesinde ve sonras\u0131nda kapsaml\u0131 testler yapmak, olas\u0131 sorunlar\u0131 erkenden tespit etmenizi sa\u011flar ve veri tutarl\u0131l\u0131\u011f\u0131n\u0131 garanti eder.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b>\n<ol>\n<li><b>Veri Tutarl\u0131l\u0131\u011f\u0131 Kontrol\u00fc:<\/b> Ge\u00e7i\u015f sonras\u0131 kaynak ve hedef veritabanlar\u0131 aras\u0131nda rastgele veri \u00f6rnekleri alarak veya checksum ara\u00e7lar\u0131 kullanarak veri tutarl\u0131l\u0131\u011f\u0131n\u0131 do\u011frulay\u0131n.<\/li>\n<li><b>Uygulama Testleri:<\/b> Uygulamalar\u0131n\u0131z\u0131 yeni veritaban\u0131na y\u00f6nlendirerek t\u00fcm i\u015flevlerin do\u011fru \u00e7al\u0131\u015ft\u0131\u011f\u0131ndan emin olun. Performans ve y\u00fck testleri yap\u0131n.<\/li>\n<li><b>Stres Testleri:<\/b> Hedef veritaban\u0131n\u0131n beklenen y\u00fck alt\u0131nda nas\u0131l performans g\u00f6sterdi\u011fini g\u00f6rmek i\u00e7in stres testleri uygulay\u0131n.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3>6.3. Geri D\u00f6n\u00fc\u015f (Rollback) Planlar\u0131<\/h3>\n<p>Herhangi bir aksilik durumunda h\u0131zl\u0131 ve g\u00fcvenli bir \u015fekilde geri d\u00f6nebilmek i\u00e7in sa\u011flam bir geri d\u00f6n\u00fc\u015f plan\u0131na sahip olmak zorunludur.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Ge\u00e7i\u015f \u00f6ncesinde kaynak veritaban\u0131n\u0131n yede\u011fini al\u0131n. Ge\u00e7i\u015f s\u0131ras\u0131nda uygulaman\u0131n eski veritaban\u0131na geri d\u00f6nebilece\u011fi bir mekanizma haz\u0131rlay\u0131n. DNS kay\u0131tlar\u0131n\u0131 veya ba\u011flant\u0131 dizelerini de\u011fi\u015ftirmeden \u00f6nce geri d\u00f6n\u00fc\u015f stratejisini netle\u015ftirin.<\/li>\n<\/ul>\n<h2>7. \u0130zleme ve Hata Ay\u0131klama Zorluklar\u0131<\/h2>\n<p>DMS migrasyonlar\u0131 s\u0131ras\u0131nda kar\u015f\u0131la\u015f\u0131lan sorunlar\u0131 h\u0131zl\u0131ca tespit etmek ve \u00e7\u00f6zmek i\u00e7in etkili izleme ve hata ay\u0131klama ara\u00e7lar\u0131n\u0131 kullanmak \u00f6nemlidir.<\/p>\n<h3>7.1. CloudWatch Metrikleri ve Loglar\u0131<\/h3>\n<p>AWS CloudWatch, DMS replikasyon \u00f6rnekleri ve g\u00f6revleri i\u00e7in zengin metrikler ve loglar sa\u011flar.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> CloudWatch konsolunu kullanarak replikasyon \u00f6rne\u011finin CPU, bellek, disk I\/O'su gibi metriklerini d\u00fczenli olarak izleyin. DMS g\u00f6rev loglar\u0131n\u0131 (Task Logs) inceleyerek hatalar\u0131, uyar\u0131lar\u0131 ve i\u015flem detaylar\u0131n\u0131 takip edin. Alarm kurarak kritik durumlarda bildirim al\u0131n.<\/li>\n<\/ul>\n<h3>7.2. DMS G\u00f6rev Loglar\u0131 Analizi<\/h3>\n<p>DMS g\u00f6rev loglar\u0131, migrasyonun her a\u015famas\u0131nda neler olup bitti\u011fini g\u00f6steren en detayl\u0131 bilgi kayna\u011f\u0131d\u0131r. Bu loglar\u0131 do\u011fru okumak, sorun giderme s\u00fcrecini h\u0131zland\u0131r\u0131r.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> DMS g\u00f6rev loglar\u0131n\u0131 CloudWatch Logs'a y\u00f6nlendirin ve CloudWatch Logs Insights kullanarak loglar\u0131 sorgulay\u0131n. Hata mesajlar\u0131n\u0131 (ERROR), uyar\u0131lar\u0131 (WARN) ve belirli anahtar kelimeleri (\u00f6rne\u011fin \"failed\", \"LOB\") arayarak ilgili sorunlar\u0131 tespit edin.<\/li>\n<\/ul>\n<h3>7.3. Hata Mesajlar\u0131n\u0131 Anlama<\/h3>\n<p>DMS taraf\u0131ndan \u00fcretilen hata mesajlar\u0131 bazen \u015fifreli olabilir. Bu mesajlar\u0131 do\u011fru yorumlamak, \u00e7\u00f6z\u00fcm bulmak i\u00e7in anahtard\u0131r.<\/p>\n<ul>\n<li><b>\u00c7\u00f6z\u00fcm:<\/b> Kar\u015f\u0131la\u015ft\u0131\u011f\u0131n\u0131z hata mesajlar\u0131n\u0131 AWS DMS dok\u00fcmantasyonunda veya AWS forumlar\u0131nda aray\u0131n. Genellikle benzer sorunlarla kar\u015f\u0131la\u015fm\u0131\u015f di\u011fer kullan\u0131c\u0131lar\u0131n veya AWS uzmanlar\u0131n\u0131n \u00e7\u00f6z\u00fcmlerini bulabilirsiniz. Gerekirse AWS Destek ekibiyle ileti\u015fime ge\u00e7mekten \u00e7ekinmeyin.<\/li>\n<\/ul>\n<h2>Sonu\u00e7<\/h2>\n<p>AWS DMS, karma\u015f\u0131k veritaban\u0131 migrasyonlar\u0131n\u0131 basitle\u015ftiren g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r. Ancak, ba\u015far\u0131l\u0131 bir ge\u00e7i\u015f i\u00e7in detayl\u0131 planlama, do\u011fru yap\u0131land\u0131rma ve dikkatli izleme \u015fartt\u0131r. Bu makalede ele ald\u0131\u011f\u0131m\u0131z yayg\u0131n sorunlar ve \u00e7\u00f6z\u00fcm yollar\u0131, kendi DMS migrasyon s\u00fcre\u00e7lerinizde kar\u015f\u0131la\u015fabilece\u011finiz engelleri a\u015fman\u0131zda size yol g\u00f6sterecektir. Unutmay\u0131n, her migrasyon benzersizdir ve kapsaml\u0131 testler, olas\u0131 riskleri minimize etmenin en iyi yoludur. \u0130yi bir haz\u0131rl\u0131k ve do\u011fru stratejilerle, AWS DMS ile sorunsuz ve ba\u015far\u0131l\u0131 bir ge\u00e7i\u015f ger\u00e7ekle\u015ftirebilirsiniz.<\/p>\n<h2>SSS (S\u0131k Sorulan Sorular)<\/h2>\n<h3>1. AWS DMS nedir?<\/h3>\n<p>AWS Database Migration Service (DMS), veritabanlar\u0131n\u0131 g\u00fcvenli bir \u015fekilde AWS'ye veya farkl\u0131 veritaban\u0131 motorlar\u0131 aras\u0131nda (\u00f6rne\u011fin Oracle'dan PostgreSQL'e) kolayca ve minimum kesinti s\u00fcresiyle ta\u015f\u0131man\u0131z\u0131 sa\u011flayan bir bulut hizmetidir.<\/p>\n<h3>2. DMS ile hangi veritabanlar\u0131 desteklenir?<\/h3>\n<p>AWS DMS, Oracle, SQL Server, MySQL, PostgreSQL, MongoDB, Amazon Aurora, Amazon Redshift, Amazon S3 gibi bir\u00e7ok pop\u00fcler veritaban\u0131 ve veri deposunu kaynak veya hedef olarak destekler.<\/p>\n<h3>3. DMS ge\u00e7i\u015fi ne kadar s\u00fcrer?<\/h3>\n<p>Ge\u00e7i\u015f s\u00fcresi, migre edilecek veri miktar\u0131na, veritaban\u0131 karma\u015f\u0131kl\u0131\u011f\u0131na, replikasyon \u00f6rne\u011fi boyutuna, a\u011f bant geni\u015fli\u011fine ve kaynak\/hedef veritabanlar\u0131n\u0131n performans\u0131na ba\u011fl\u0131 olarak de\u011fi\u015fir. K\u00fc\u00e7\u00fck veritabanlar\u0131 saatler i\u00e7inde, b\u00fcy\u00fck veritabanlar\u0131 ise g\u00fcnler veya haftalar s\u00fcrebilir.<\/p>\n<h3>4. DMS ge\u00e7i\u015fi s\u0131ras\u0131nda veri kayb\u0131 ya\u015fan\u0131r m\u0131?<\/h3>\n<p>Do\u011fru yap\u0131land\u0131r\u0131ld\u0131\u011f\u0131nda ve izlendi\u011finde, AWS DMS minimum veri kayb\u0131 veya hi\u00e7 veri kayb\u0131 olmadan ge\u00e7i\u015f yapmay\u0131 hedefler. CDC (De\u011fi\u015fiklik Verisi Yakalama) \u00f6zelli\u011fi, kaynak veritaban\u0131ndaki de\u011fi\u015fiklikleri ger\u00e7ek zamanl\u0131 olarak yakalayarak veri tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flar. Ancak yanl\u0131\u015f yap\u0131land\u0131rma veya beklenmedik hatalar veri kayb\u0131na yol a\u00e7abilir, bu y\u00fczden dikkatli testler ve yedeklemeler \u00f6nemlidir.<\/p>\n<h3>5. DMS maliyetleri nas\u0131l hesaplan\u0131r?<\/h3>\n<p>AWS DMS maliyetleri, kullan\u0131lan replikasyon \u00f6rne\u011finin t\u00fcr\u00fc ve boyutu, migre edilen veri miktar\u0131 ve ek depolama alan\u0131 gibi fakt\u00f6rlere g\u00f6re hesaplan\u0131r. Genellikle, replikasyon \u00f6rne\u011finin saatlik \u00fccreti ve migre edilen veri i\u00e7in depolama \u00fccreti temel maliyet kalemleridir. AWS fiyatland\u0131rma sayfas\u0131n\u0131 kontrol etmek en g\u00fcncel bilgiyi sa\u011flar.<\/p>\n","protected":false},"excerpt":{"rendered":"Bulut tabanl\u0131 \u00e7\u00f6z\u00fcmlere ge\u00e7i\u015f, modern i\u015fletmeler i\u00e7in ka\u00e7\u0131n\u0131lmaz bir ad\u0131md\u0131r ve AWS Database Migration Service (DMS), bu s\u00fcreci basitle\u015ftiren &#8230;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1406],"tags":[],"class_list":{"0":"post-38149","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-aws","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AWS DMS Migrasyonlar\u0131nda Kar\u015f\u0131la\u015f\u0131lan Yayg\u0131n Sorunlar ve \u00c7\u00f6z\u00fcm Yollar\u0131 - 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