1. Buat semula operasi log: Pastikan data terbaharu yang terjejas oleh transaksi yang diserahkan dibuang ke halaman data.
2. Buat asal operasi log: Pastikan halaman data yang terjejas oleh urus niaga tanpa komitmen digulung semula.
3. Tulis penimbal (tukar penimbal) cantum.
4.
Mekanisme pengumpulan sampah InnoDB yang menggunakan benang latar belakang yang berasingan untuk memproses data yang ditandakan untuk dipadamkan secara berkala dalam indeks.
Instance
/* 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); }
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