{"id":185,"date":"2015-02-27T17:00:10","date_gmt":"2015-02-27T20:00:10","guid":{"rendered":"https:\/\/maurobernal.com.ar\/blog\/?p=185"},"modified":"2020-09-10T23:50:21","modified_gmt":"2020-09-11T02:50:21","slug":"reparar-una-base-danada","status":"publish","type":"post","link":"https:\/\/maurobernal.com.ar\/blog\/reparar-una-base-danada\/","title":{"rendered":"Reparar una base da\u00f1ada de MS SQL Server"},"content":{"rendered":"\n

\u00daltimamente me ha tocado quemarme las pesta\u00f1as por casos de bases de datos da\u00f1adas. Una mala infraestructura, y\/o un mal plan de backups termina provocando este tipo de post luego de sufrir por un rato…<\/p>\n\n\n

Reparar una base da\u00f1ada<\/h1>\n

El siguiente es un error com\u00fan cuando se da\u00f1a una base:

<\/span>Msg\u00a0824,\u00a0Level\u00a024,\u00a0State\u00a02,\u00a0Line\u00a011
SQL\u00a0Server\u00a0detected\u00a0a\u00a0logical\u00a0consistency-based\u00a0I\/O\u00a0error:\u00a0incorrect\u00a0pageid\u00a0(expected\u00a01:49876;\u00a0actual\u00a017253:-991032068).\u00a0It\u00a0occurred\u00a0during\u00a0a\u00a0read\u00a0of\u00a0page\u00a0(1:49876)\u00a0in\u00a0database\u00a0ID\u00a015\u00a0at\u00a0offset\u00a00x000000185a8000\u00a0in\u00a0file\u00a0‘E:\\Bases\\SBDAXXXX.MDF’.\u00a0\u00a0Additional\u00a0messages\u00a0in\u00a0the\u00a0SQL\u00a0Server\u00a0error\u00a0log\u00a0or\u00a0system\u00a0event\u00a0log\u00a0may\u00a0provide\u00a0more\u00a0detail.\u00a0This\u00a0is\u00a0a\u00a0severe\u00a0error\u00a0condition\u00a0that\u00a0threatens\u00a0database\u00a0integrity\u00a0and\u00a0must\u00a0be\u00a0corrected\u00a0immediately.\u00a0Complete\u00a0a\u00a0full\u00a0database\u00a0consistency\u00a0check\u00a0(DBCC\u00a0CHECKDB).\u00a0This\u00a0error\u00a0can\u00a0be\u00a0caused\u00a0by\u00a0many\u00a0factors;\u00a0for\u00a0more\u00a0information,\u00a0see\u00a0SQL\u00a0Server\u00a0Books\u00a0Online.
<\/span><\/p>\n

A continuaci\u00f3n los pasos que se deber\u00eda seguir:<\/p>\n

    \n
  1. Intentar hacer un backup de la base<\/li>\n
  2. Obtener la cantidad de registros que hay en ese momento en cada tabla (script adjunto al final)<\/li>\n
  3. Colocar la base en modo de usuario \u00fanico\n
    ALTER DATABASE SBDAXXXX SET SINGLE_USER WITH ROLLBACK IMMEDIATE<\/pre>\n
    \u00a0<\/p>\n<\/li>\n
  4. Intentar reparar la base\n
    DBCC CHECKDB(SBDAXXXX,REPAIR_ALLOW_DATA_LOSS)<\/pre>\n
    \u00a0<\/span><\/span><\/p>\n<\/li>\n
  5. Verificar la cantidad de registros actual (script adjunto al final)<\/li>\n<\/ol>\n
    DECLARE @Tabla VARCHAR(250)\nDECLARE @SQL VARCHAR(2000)\nCREATE TABLE #TablaTemp(ID INT IDENTITY(1,1),Tabla_Nombre VARCHAR(200),Cant_Registros INT)\n\nDECLARE TINFO_CUR CURSOR FOR \nSELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES \nWHERE TABLE_TYPE='BASE TABLE'\n\nOPEN TINFO_CUR\nFETCH NEXT FROM TINFO_CUR INTO @Tabla\nWHILE @@FETCH_STATUS =0\nBEGIN\nSET @SQL='INSERT INTO #TablaTemp(Tabla_Nombre,Cant_Registros) SELECT '''+@Tabla+''',COUNT(*) FROM '+@Tabla+''\nEXECUTE (@SQL)\nFETCH NEXT FROM TINFO_CUR INTO @Tabla\nEND\nCLOSE TINFO_CUR\nDEALLOCATE TINFO_CUR\n\n\nSELECT * FROM #TablaTemp ORDER BY Tabla_Nombre\n\nDROP TABLE #TablaTemp<\/pre>\n
    \u00a0<\/p>\n
    Si la base est\u00e1 muy da\u00f1ada posiblemente no se repara, o se pierde informaci\u00f3n. En ese caso se puede recurrir a un software de 3ro para intentar reparar el .MDF.<\/p>","protected":false},"excerpt":{"rendered":"
    \u00daltimamente me ha tocado quemarme las pesta\u00f1as por casos de bases de datos da\u00f1adas. Una mala infraestructura, y\/o un mal plan de backups termina provocando este tipo de post luego…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4,3],"tags":[75,76,36,8,16,37,29],"class_list":["post-185","post","type-post","status-publish","format-standard","hentry","category-mssql","category-t-sql","tag-checkdb","tag-contar-registros","tag-mdf","tag-mssql-2","tag-sql","tag-sql-server","tag-tsql"],"yoast_head":"\nReparar una base da\u00f1ada de MS SQL Server · devops Mauro Bernal<\/title>\n<meta name=\"description\" content=\"Reparar una base 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