{"id":5894,"date":"2026-06-16T16:15:28","date_gmt":"2026-06-16T16:15:28","guid":{"rendered":"https:\/\/cloudsave.app\/knowledge-base\/mssql-transaction-log-full-recovery\/"},"modified":"2026-06-16T16:44:41","modified_gmt":"2026-06-16T16:44:41","slug":"mssql-i-tehingulogi-on-t%c3%a4is-ennetus-ja-kiirtaastestrateegiad","status":"publish","type":"post","link":"https:\/\/cloudsave.app\/et\/knowledge-base\/mssql-i-tehingulogi-on-t%c3%a4is-ennetus-ja-kiirtaastestrateegiad\/","title":{"rendered":"MSSQL-i tehingulogi on t\u00e4is: ennetus- ja kiirtaastestrateegiad"},"content":{"rendered":"

Andmebaasiadministraatorite (DBA) ja DevOps-inseneride jaoks, kes haldavad Microsoft SQL Serverit, on v\u00e4he hoiatusi, mis tekitavad nii palju kohest \u00e4revust kui viga 9002: The transaction log for database ‘X’ is full<\/em> (Andmebaasi ‘X’ tehingulogi on t\u00e4is). Kui tehingulogi saab t\u00e4is ja ei saa enam kasvada, muutub andmebaas sisuliselt kirjutuskaitstuks. K\u00f5ik INSERT<\/code>, UPDATE<\/code> ja DELETE<\/code> toimingud peatuvad, rakenduste tehingud eba\u00f5nnestuvad ja tootmine seiskub.<\/p>\n

SQL Serveri tehingulogi arhitektuuri m\u00f5istmine, algp\u00f5hjuse t\u00e4pne diagnoosimine ja kiire taastamisprotseduuride l\u00e4biviimine on kriitilise t\u00e4htsusega oskused k\u00f5rge k\u00e4ttesaadavuse s\u00e4ilitamiseks. See p\u00f5hjalik juhend uurib tehingulogi toimimist, kuidas lahendada t\u00e4is logi h\u00e4daolukorras ja millised on arhitektuursed parimad tavad, et v\u00e4ltida selle kordumist.<\/p>\n

SQL Serveri tehingulogi arhitektuuri m\u00f5istmine<\/h2>\n

Tehingulogi t\u00e4itumise t\u00f5husaks t\u00f5rkeotsinguks peate esmalt m\u00f5istma, kuidas SQL Server andmeid kirjutab ja haldab.<\/p>\n

Write-Ahead Logging (WAL)<\/h3>\n

SQL Server kasutab Write-Ahead Logging (WAL) protokolli. Alati, kui toimub andmete muutmine, kirjutatakse muudatus esmalt m\u00e4lus olevasse tehingulogi ja seej\u00e4rel t\u00fchjendatakse kettal asuvasse f\u00fc\u00fcsilisse logifaili, enne kui tegelikud andmelehed andmebaasifailides (MDF\/NDF) uuendatakse. See tagab ACID-vastavuse (aatomilisus, j\u00e4rjepidevus, isolatsioon, vastupidavus), tagades, et krahhi korral saab SQL Server tehinguid uuesti esitada (roll forward) v\u00f5i t\u00fchistada (roll back).<\/p>\n

Virtuaalsed logifailid (VLF) ja ringlogimine<\/h3>\n

Sisemiselt on f\u00fc\u00fcsiline tehingulogifail (LDF) jagatud v\u00e4iksemateks loogilisteks segmentideks, mida nimetatakse virtuaalseteks logifailideks (VLF). Tehingulogi t\u00f6\u00f6tab ringikujuliselt. Logikirjete kirjutamisel t\u00e4idavad need \u00fche VLF-i ja liiguvad j\u00e4rgmise juurde.<\/p>\n

Kui logi j\u00f5uab f\u00fc\u00fcsilise faili l\u00f5ppu, \u00fcritab see naasta algusesse. Siiski saab see VLF-i \u00fcle kirjutada ainult siis, kui see VLF on m\u00e4rgitud mitteaktiivseks<\/strong>. Kui k\u00f5ik VLF-id on aktiivsed (mis t\u00e4hendab, et need sisaldavad logikirjeid, mida SQL Server veel vajab), ei saa logi ringi k\u00e4ia. Kui automaatne kasv (auto-growth) on lubatud ja kettaruumi on saadaval, siis f\u00fc\u00fcsiline fail kasvab. Kui ketas on t\u00e4is v\u00f5i automaatne kasv on piiratud, kohtate viga 9002.<\/p>\n

Logi k\u00e4rpimine (Truncation) vs. logi v\u00e4hendamine (Shrinking)<\/h3>\n

Levinud eksiarvamus on, et logi k\u00e4rpimine v\u00e4hendab f\u00fc\u00fcsilise faili suurust.
\n* Logi k\u00e4rpimine (Log Truncation):<\/strong> Protsess, mille k\u00e4igus m\u00e4rgitakse aktiivsed VLF-id mitteaktiivseteks, muutes ruumi uuesti kasutatavaks. See ei<\/em> v\u00e4henda LDF-faili suurust kettal.
\n* Logi v\u00e4hendamine (Log Shrinking):<\/strong> Protsess, mille k\u00e4igus v\u00e4hendatakse f\u00fc\u00fcsiliselt LDF-faili suurust ja tagastatakse ruum operatsioonis\u00fcsteemile.<\/p>\n

Full Recovery mudelis toimub logi k\u00e4rpimine ainult<\/em> siis, kui tehingulogi varundamine on edukalt l\u00f5pule viidud (eeldusel, et \u00fckski teine protsess ei hoia logi aktiivsena).<\/p>\n

Veateate \u201eTransaction Log Full\u201c (viga 9002) diagnoosimine<\/h2>\n

Kui logi on t\u00e4is, ei ole teie esimene samm pimesi kettaruumi lisamine v\u00f5i failide v\u00e4hendamine. Peate tuvastama, miks<\/em> logi ei saa k\u00e4rpida. SQL Server pakub sisseehitatud mehhanismi, et \u00f6elda t\u00e4pselt, mis takistab logi taaskasutamist sys.databases<\/code> kataloogivaate kaudu.<\/p>\n

Kitsaskoha tuvastamiseks k\u00e4ivitage j\u00e4rgmine T-SQL k\u00e4sk:<\/p>\n

SELECT \n    name AS DatabaseName, \n    recovery_model_desc AS RecoveryModel, \n    log_reuse_wait_desc AS LogReuseWaitReason\nFROM sys.databases\nWHERE name = 'YourDatabaseName';\n<\/code><\/pre>\n
Samuti saate kontrollida oma tehingulogide praegust ruumikasutust, kasutades k\u00e4sku:<\/p>\n
DBCC SQLPERF(LOGSPACE);\n<\/code><\/pre>\n
Levinud log_reuse_wait_desc<\/code> olekud<\/h3>\n
    \n
  1. LOG_BACKUP:<\/strong> Andmebaas on Full v\u00f5i Bulk-Logged taastamismudelis ja tehingulogi varundamist pole hiljuti tehtud. See on k\u00f5ige levinum p\u00f5hjus.<\/li>\n
  2. ACTIVE_TRANSACTION:<\/strong> Kauakestev tehing (nt massiivne indeksi \u00fclesehitamine v\u00f5i unustatud kinnitamata tehing) hoiab logi aktiivsena.<\/li>\n
  3. REPLICATION \/ CDC:<\/strong> Transactional Replication v\u00f5i Change Data Capture (CDC) on lubatud ja Log Reader Agent pole veel tehinguid t\u00f6\u00f6delnud.<\/li>\n
  4. AVAILABILITY_REPLICA:<\/strong> AlwaysOn Availability Groupi puhul on sekundaarne replika lahti \u00fchendatud v\u00f5i s\u00fcnkroonib liiga aeglaselt, sundides primaarset replikat logikirjeid s\u00e4ilitama, kuni need on sekundaarsel replikal kinnistatud.<\/li>\n<\/ol>\n
    Kiire taastamise strateegiad: probleemi lahendamine tootmiskeskkonnas<\/h2>\n
    S\u00f5ltuvalt tagastatud log_reuse_wait_desc<\/code> v\u00e4\u00e4rtusest on teie h\u00e4daolukorra lahendus erinev. Siin on kiired taastamisstrateegiad k\u00f5ige levinumate stsenaariumide jaoks.<\/p>\n
    Stsenaarium 1: Puuduvad v\u00f5i eba\u00f5nnestunud logivarundused (LOG_BACKUP<\/code>)<\/h3>\n
    Kui oote t\u00fc\u00fcp on LOG_BACKUP<\/code>, on lahendus lihtne: peate tehingulogi varundama.<\/p>\n
    BACKUP LOG [YourDatabaseName] \nTO DISK = 'N:BackupsYourDatabaseName_EmergencyLog.trn' \nWITH COMPRESSION, STATS = 10;\n<\/code><\/pre>\n
    Kui varundamine on l\u00f5petatud, k\u00e4rbitakse mitteaktiivsed VLF-id ja SQL Server j\u00e4tkab tavap\u00e4rast t\u00f6\u00f6d. Kui teie varundusketas on t\u00e4is, peate v\u00f5ib-olla varundama ajutisele v\u00f5rgukettale v\u00f5i null-seadmesse (v\u00e4ga mittesoovitatav, kui andmebaas pole kergesti taastatav, kuna see l\u00f5hub logiahela):<\/p>\n
    -- HOIATUS: See l\u00f5hub logiahela ja kahjustab ajapunkti taastamist.\n-- Kasutage ainult siis, kui see on h\u00e4davajalik, ja tehke kohe p\u00e4rast seda FULL varundus.\nBACKUP LOG [YourDatabaseName] TO DISK = 'NUL';\n<\/code><\/pre>\n
    Stsenaarium 2: Kauakestvad aktiivsed tehingud (ACTIVE_TRANSACTION<\/code>)<\/h3>\n
    Kui \u00fcks tehing on kestnud tunde, takistab see logi k\u00e4rpimist kogu selle aja jooksul. Esmalt tuvastage probleemne tehing:<\/p>\n
    DBCC OPENTRAN('YourDatabaseName');\n<\/code><\/pre>\n
    See k\u00e4sk tagastab vanima aktiivse tehingu ja selle serveriprotsessi ID (SPID). Lisateavet selle kohta, mida SPID teeb, saate d\u00fcnaamiliste haldusvaadete (DMV) kaudu:<\/p>\n
    SELECT \n    s.session_id,\n    s.login_name,\n    s.host_name,\n    r.start_time,\n    r.status,\n    r.command,\n    t.text AS QueryText\nFROM sys.dm_exec_sessions s\nJOIN sys.dm_exec_requests r ON s.session_id = r.session_id\nCROSS APPLY sys.dm_exec_sql_text(r.sql_handle) t\nWHERE s.session_id = <SPID_FROM_DBCC_OPENTRAN>;\n<\/code><\/pre>\n
    Kui tehing on pahatahtlik p\u00e4ring v\u00f5i seiskunud protsess, peate v\u00f5ib-olla selle logi vabastamiseks katkestama.<\/p>\n
    KILL <SPID>;\n<\/code><\/pre>\n
    M\u00e4rkus: Massiivse tehingu katkestamine k\u00e4ivitab tagasip\u00f6\u00f6ramise (rollback), mis v\u00f5ib v\u00f5tta m\u00e4rkimisv\u00e4\u00e4rselt aega ja tekitab ajutiselt t\u00e4iendavat logitegevust. \u00c4rge taask\u00e4ivitage SQL Serveri teenust tagasip\u00f6\u00f6ramise ajal, vastasel juhul l\u00e4heb andmebaas taask\u00e4ivitamisel taastere\u017eiimi.<\/em><\/p>\n
    Stsenaarium 3: H\u00e4daolukorra ruumieraldus (ketas on 100% t\u00e4is)<\/h3>\n
    Kui LDF-fail on h\u00f5ivanud kogu ketta, ei saa te isegi varundust k\u00e4ivitada, sest SQL Server vajab varunduss\u00fcndmuse enda salvestamiseks veidi logiruumi. Sellisel juhul peate lisama sekundaarse logifaili teisele kettale, kus on vaba ruumi.<\/p>\n
    ALTER DATABASE [YourDatabaseName]\nADD LOG FILE \n(\n    NAME = N'YourDatabaseName_Log2',\n    FILENAME = N'E:TempLogsYourDatabaseName_Log2.ldf',\n    SIZE = 5GB,\n    MAXSIZE = 50GB,\n    FILEGROWTH = 1GB\n);\n<\/code><\/pre>\n
    See annab SQL Serverile koheselt hingamisruumi. Kui andmebaas on v\u00f5rgus, tehke tehingulogi varundus, t\u00fchjendage sekundaarne logifail ja eemaldage see:<\/p>\n
    -- 1. Tehke logi varundus, et logi k\u00e4rpida\nBACKUP LOG [YourDatabaseName] TO DISK = '...';\n\n-- 2. T\u00fchjendage ajutine logifail\nDBCC SHRINKFILE (N'YourDatabaseName_Log2', EMPTYFILE);\n\n-- 3. Eemaldage ajutine logifail\nALTER DATABASE [YourDatabaseName] REMOVE FILE [YourDatabaseName_Log2];\n<\/code><\/pre>\n
    Parimad tavad tehingulogi ennetamiseks ja haldamiseks<\/h2>\n
    Reaktiivne t\u00f5rkeotsing on stressirohke ja m\u00f5jutab teenusetaseme lepinguid (SLA). Ennetavate arhitektuursete ja operatiivsete parimate tavade rakendamine on ettev\u00f5tte andmebaasi stabiilsuse jaoks h\u00e4davajalik.<\/p>\n
    1. Rakendage tugev ja automatiseeritud varundusstrateegia<\/h3>\n
    Kui andmebaas on Full taastamismudelis, on sagedased tehingulogi varundused kohustuslikud. S\u00f5ltuvalt teie taastepunkti eesm\u00e4rgist (RPO) ja tehingute mahust peaksid logivarundused toimuma iga 5\u201315 minuti j\u00e4rel.<\/p>\n
    Ettev\u00f5tte varunduslahendused, nagu CloudSave, lihtsustavad seda protsessi m\u00e4rkimisv\u00e4\u00e4rselt. Integreerudes otse SQL Serveriga VDI (Virtual Device Interface) kaudu, v\u00f5imaldab CloudSave DBA-del konfigureerida poliitikap\u00f5hiseid, suure sagedusega tehingulogi varundusi. See tagab, et logid k\u00e4rbitakse pidevalt, kr\u00fcpteeritakse turvaliselt ja salvestatakse v\u00e4ljaspool asukohta v\u00f5i muutumatusse pilvesalvestusse, v\u00e4ltides LOG_BACKUP<\/code> ooteolekut ilma keeruliste kohandatud SQL Agent t\u00f6\u00f6de vajaduseta.<\/p>\n
    2. M\u00e4\u00e4rake tehingulogile \u00f5ige suurus ja hallake VLF-e<\/h3>\n
    Automaatsele kasvule lootmine tehingulogi suuruse haldamisel on ohtlik anti-muster. Automaatse kasvu toimingud on kulukad ja peatavad tehingute t\u00f6\u00f6tlemise, kuni ketas on nullitud (v\u00e4lja arvatud juhul, kui on lubatud Instant File Initialization, mis ei<\/em> kehti logifailidele).<\/p>\n
    Lisaks p\u00f5hjustavad sagedased v\u00e4ikesed automaatsed kasvud (nt 10% v\u00f5i 50 MB kaupa) VLF-i fragmenteerumist<\/strong>. Tehingulogi, milles on tuhandeid pisikesi VLF-e, halvendab m\u00e4rgatavalt andmebaasi k\u00e4ivitusaega, varundamise j\u00f5udlust ja replikatsiooni latentsust.<\/p>\n
      \n
    • M\u00e4\u00e4rake logi suurus ette:<\/strong> Anal\u00fc\u00fcsige oma suurimaid hooldustoiminguid (nagu indeksite \u00fclesehitamine) ja m\u00e4\u00e4rake LDF-faili suurus ette, et need mahuksid \u00e4ra ilma kasvuta.<\/li>\n
    • M\u00e4\u00e4rake fikseeritud automaatne kasv:<\/strong> Muutke automaatne kasv protsendist fikseeritud suuruseks (nt 1 GB v\u00f5i 5 GB), et tagada VLF-ide loomine tervislikus suuruses.<\/li>\n<\/ul>\n
      Saate kontrollida oma VLF-ide arvu j\u00e4rgmise p\u00e4ringuga (SQL Server 2017+ puhul):<\/p>\n
      SELECT \n    db_name(database_id) AS DatabaseName,\n    COUNT(vlf_sequence_number) AS VLF_Count\nFROM sys.dm_db_log_info(DB_ID('YourDatabaseName'));\n<\/code><\/pre>\n
      Kui teie VLF-ide arv on \u00fcle 500, kaaluge vaikse perioodi ootamist, logi v\u00e4hendamist minimaalse suuruseni ja selle k\u00e4sitsi suurendamist vajaliku suuruseni suurte t\u00fckkidena.<\/p>\n
      3. Optimeerige indeksi hooldustoiminguid<\/h3>\n
      Indeksite \u00fclesehitamine on t\u00e4ielikult logitud toiming, isegi Bulk-Logged taastamismudelis (s\u00f5ltuvalt indeksi t\u00fc\u00fcbist). 500 GB indeksi \u00fclesehitamine tekitab v\u00e4hemalt 500 GB tehingulogi kirjeid.<\/p>\n
      Logi paisumise leevendamiseks hoolduse ajal:
      \n*   Kasutage indeksite \u00fclesehitamisel SORT_IN_TEMPDB = ON<\/code>. See suunab sortimisfaasi TempDB-sse, v\u00e4hendades koormust andmebaasi tehingulogile.
      \n*   V\u00f5imalusel vahetage indeksi \u00fclesehitamine<\/em> (rebuild) indeksi korrastamise<\/em> (reorganize) vastu, kuna korrastamine on logi seisukohalt t\u00f5husam ja seda saab katkestada ilma kogu toimingut tagasi p\u00f6\u00f6ramata.
      \n*   Partitsioneerige suured DELETE<\/code> v\u00f5i UPDATE<\/code> toimingud. Selle asemel, et kustutada 10 miljonit rida \u00fche tehinguga, kustutage need 50 000-kaupa, kinnitades (commit) ja lubades logivarundustel logi partiide vahel k\u00e4rpida.<\/p>\n
      4. J\u00e4lgige k\u00f5rge k\u00e4ttesaadavuse ja replikatsiooni topoloogiaid<\/h3>\n
      AlwaysOn Availability Groupides ei saa primaarne replika oma logi k\u00e4rpida enne, kui logikirjed on kinnistatud k\u00f5igil s\u00fcnkroonsetel ja as\u00fcnkroonsetel sekundaarsetel replikatel.<\/p>\n
      Kui sekundaarne replika l\u00e4heb v\u00f5rgu\u00fchenduseta v\u00f5i kui v\u00f5rgu ribalaius ei suuda sammu pidada primaarse tehingute genereerimise kiirusega, kasvab primaarse replika saatmisj\u00e4rjekord ja logi t\u00e4itub (AVAILABILITY_REPLICA<\/code> oote t\u00fc\u00fcp).<\/p>\n
      Rakendage tugev j\u00e4lgimine SQLServer:Replica > Log Send Queue<\/code> j\u00f5udlusloenduri jaoks. Kui sekundaarne replika on j\u00e4\u00e4davalt kadunud, peate selle Availability Groupist eemaldama v\u00f5i andmete liikumise peatama, et v\u00f5imaldada primaarse logi k\u00e4rpimist.<\/p>\n
      Kokkuv\u00f5te<\/h2>\n
      T\u00e4is tehingulogiga kokkupuutumine on andmebaasiadministraatorite jaoks tavap\u00e4rane katsumus, kuid see ei pea l\u00f5ppema pikaajalise seisakuga. M\u00f5istes Write-Ahead Loggingi ja VLF-ide toimimist, saate kiiresti diagnoosida algp\u00f5hjuse, kasutades sys.databases<\/code> vaadet, ja rakendada \u00f5iget kiiret taastamisstrateegiat.<\/p>\n
      Pikaajaline stabiilsus s\u00f5ltub reaktiivsetest parandustest loobumisest. Logifailide suuruse ette m\u00e4\u00e4ramine, hooldusrutiinide optimeerimine ja ettev\u00f5tte tasemel varundusplatvormide, nagu CloudSave, kasutamine rangete ja automatiseeritud logivarundusgraafikute j\u00f5ustamiseks tagab, et teie tehingulogid p\u00fcsivad terved, k\u00e4rbitud ja valmis toetama suure l\u00e4bilaskev\u00f5imega tootmiskoormusi.<\/p>\n","protected":false},"excerpt":{"rendered":"
      ** Discover expert strategies for preventing and resolving MSSQL transaction log full errors (Error 9002). Learn rapid recovery techniques, VLF management, and architectural best practices for DBAs.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"MSSQL Transaction Log Full: Prevention & Recovery","rank_math_description":"** Discover expert strategies for preventing and resolving MSSQL transaction log full errors (Error 9002). 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