本篇內(nèi)容介紹了“MySQL InnoDB的崩潰恢復(fù)過程是什么”的有關(guān)知識(shí),在實(shí)際案例的操作過程中,不少人都會(huì)遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
創(chuàng)新互聯(lián)堅(jiān)持“要么做到,要么別承諾”的工作理念,服務(wù)領(lǐng)域包括:成都網(wǎng)站制作、網(wǎng)站設(shè)計(jì)、企業(yè)官網(wǎng)、英文網(wǎng)站、手機(jī)端網(wǎng)站、網(wǎng)站推廣等服務(wù),滿足客戶于互聯(lián)網(wǎng)時(shí)代的立山網(wǎng)站設(shè)計(jì)、移動(dòng)媒體設(shè)計(jì)的需求,幫助企業(yè)找到有效的互聯(lián)網(wǎng)解決方案。努力成為您成熟可靠的網(wǎng)絡(luò)建設(shè)合作伙伴!
1、redo log操作:保證已提交事務(wù)影響的最新數(shù)據(jù)刷到數(shù)據(jù)頁(yè)里。
2、undo log操作:保證未提交事務(wù)影響的數(shù)據(jù)頁(yè)回滾。
3、寫緩沖(change buffer)合并。
4、purge操作。
InnoDB的一種垃圾收集機(jī)制,使用單獨(dú)的后臺(tái)線程周期性處理索引中標(biāo)記刪除的數(shù)據(jù)。
實(shí)例
/* Look for MLOG_CHECKPOINT. */ recv_group_scan_log_recs(group, &contiguous_lsn, false); /* The first scan should not have stored or applied any records. */ ut_ad(recv_sys->n_addrs == 0); ut_ad(!recv_sys->found_corrupt_fs); if (recv_sys->found_corrupt_log && !srv_force_recovery) { log_mutex_exit(); return(DB_ERROR); } if (recv_sys->mlog_checkpoint_lsn == 0) { if (!srv_read_only_mode && group->scanned_lsn != checkpoint_lsn) { ib::error() << "Ignoring the redo log due to missing" " MLOG_CHECKPOINT between the checkpoint " << checkpoint_lsn << " and the end " << group->scanned_lsn << "."; if (srv_force_recovery < SRV_FORCE_NO_LOG_REDO) { log_mutex_exit(); return(DB_ERROR); } } group->scanned_lsn = checkpoint_lsn; rescan = false; } else { contiguous_lsn = checkpoint_lsn; rescan = recv_group_scan_log_recs( group, &contiguous_lsn, false); if ((recv_sys->found_corrupt_log && !srv_force_recovery) || recv_sys->found_corrupt_fs) { log_mutex_exit(); return(DB_ERROR); } } /* NOTE: we always do a 'recovery' at startup, but only if there is something wrong we will print a message to the user about recovery: */ if (checkpoint_lsn != flush_lsn) { if (checkpoint_lsn + SIZE_OF_MLOG_CHECKPOINT < flush_lsn) { ib::warn() << " Are you sure you are using the" " right ib_logfiles to start up the database?" " Log sequence number in the ib_logfiles is " << checkpoint_lsn << ", less than the" " log sequence number in the first system" " tablespace file header, " << flush_lsn << "."; } if (!recv_needed_recovery) { ib::info() << "The log sequence number " << flush_lsn << " in the system tablespace does not match" " the log sequence number " << checkpoint_lsn << " in the ib_logfiles!"; if (srv_read_only_mode) { ib::error() << "Can't initiate database" " recovery, running in read-only-mode."; log_mutex_exit(); return(DB_READ_ONLY); } recv_init_crash_recovery(); } } log_sys->lsn = recv_sys->recovered_lsn; if (recv_needed_recovery) { err = recv_init_crash_recovery_spaces(); if (err != DB_SUCCESS) { log_mutex_exit(); return(err); } if (rescan) { contiguous_lsn = checkpoint_lsn; recv_group_scan_log_recs(group, &contiguous_lsn, true); if ((recv_sys->found_corrupt_log && !srv_force_recovery) || recv_sys->found_corrupt_fs) { log_mutex_exit(); return(DB_ERROR); } } } else { ut_ad(!rescan || recv_sys->n_addrs == 0); }
“mysql InnoDB的崩潰恢復(fù)過程是什么”的內(nèi)容就介紹到這里了,感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識(shí)可以關(guān)注創(chuàng)新互聯(lián)網(wǎng)站,小編將為大家輸出更多高質(zhì)量的實(shí)用文章!