AWS DMS High Latency on Oracle CDC Source

Hi,

I'm having a high latency during the CDC on the source database. I would like to now if there is a way to tuning the configuration in order to decrease the latency or if there is anything else that I can do.

Migration Task CDC metrics:

Replication Instance metrics:

My current configuration: Source endpoint configuration: Oracle

{
    "AddSupplementalLogging": true,
    "ExtraArchivedLogDestIds": [],
    "AllowSelectNestedTables": true,
    "DatabaseName": "XXXXX",
    "UseBFile": true,
    "UseLogminerReader": false,
    "SecretsManagerAccessRoleArn": "XXXXXX",
    "SecretsManagerSecretId": "XXXXXXX"
}

Target endpoint configuration: Redshift

{
    "DatabaseName": "XXXXXX",
    "DateFormat": "auto",
    "MaxFileSize": 250000,
    "TimeFormat": "auto",
    "SecretsManagerAccessRoleArn": "XXXXXXX",
    "SecretsManagerSecretId": "XXXXXXX"
}

Replication Instance:

• Instance class: dms.c5.9xlarge
• Allocated storage: 1.2TB
• Multi AZ: yes

Migration Task:

{
    "Logging": {
        "EnableLogging": true,
        "EnableLogContext": false,
        "LogComponents": [
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "TRANSFORMATION"
            },
            {
                "Severity": "LOGGER_SEVERITY_INFO",
                "Id": "SOURCE_UNLOAD"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "IO"
            },
            {
                "Severity": "LOGGER_SEVERITY_INFO",
                "Id": "TARGET_LOAD"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "PERFORMANCE"
            },
            {
                "Severity": "LOGGER_SEVERITY_INFO",
                "Id": "SOURCE_CAPTURE"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "SORTER"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "REST_SERVER"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "VALIDATOR_EXT"
            },
            {
                "Severity": "LOGGER_SEVERITY_INFO",
                "Id": "TARGET_APPLY"
            },
            {
                "Severity": "LOGGER_SEVERITY_INFO",
                "Id": "TASK_MANAGER"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "TABLES_MANAGER"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "METADATA_MANAGER"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "FILE_FACTORY"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "COMMON"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "ADDONS"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "DATA_STRUCTURE"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "COMMUNICATION"
            },
            {
                "Severity": "LOGGER_SEVERITY_DEFAULT",
                "Id": "FILE_TRANSFER"
            }
        ],
        "CloudWatchLogGroup": "XXXXXX",
        "CloudWatchLogStream": "XXXXXX"
    },
    "StreamBufferSettings": {
        "StreamBufferCount": 3,
        "CtrlStreamBufferSizeInMB": 5,
        "StreamBufferSizeInMB": 8
    },
    "ErrorBehavior": {
        "FailOnNoTablesCaptured": true,
        "ApplyErrorUpdatePolicy": "LOG_ERROR",
        "FailOnTransactionConsistencyBreached": false,
        "RecoverableErrorThrottlingMax": 1800,
        "DataErrorEscalationPolicy": "SUSPEND_TABLE",
        "ApplyErrorEscalationCount": 0,
        "RecoverableErrorStopRetryAfterThrottlingMax": true,
        "RecoverableErrorThrottling": true,
        "ApplyErrorFailOnTruncationDdl": false,
        "DataTruncationErrorPolicy": "LOG_ERROR",
        "ApplyErrorInsertPolicy": "LOG_ERROR",
        "EventErrorPolicy": "IGNORE",
        "ApplyErrorEscalationPolicy": "LOG_ERROR",
        "RecoverableErrorCount": -1,
        "DataErrorEscalationCount": 0,
        "TableErrorEscalationPolicy": "STOP_TASK",
        "RecoverableErrorInterval": 5,
        "ApplyErrorDeletePolicy": "IGNORE_RECORD",
        "TableErrorEscalationCount": 0,
        "FullLoadIgnoreConflicts": true,
        "DataErrorPolicy": "LOG_ERROR",
        "TableErrorPolicy": "SUSPEND_TABLE"
    },
    "TTSettings": {
        "TTS3Settings": null,
        "TTRecordSettings": null,
        "EnableTT": false
    },
    "FullLoadSettings": {
        "CommitRate": 50000,
        "StopTaskCachedChangesApplied": false,
        "StopTaskCachedChangesNotApplied": false,
        "MaxFullLoadSubTasks": 49,
        "TransactionConsistencyTimeout": 600,
        "CreatePkAfterFullLoad": true,
        "TargetTablePrepMode": "TRUNCATE_BEFORE_LOAD"
    },
    "TargetMetadata": {
        "ParallelApplyBufferSize": 1000,
        "ParallelApplyQueuesPerThread": 0,
        "ParallelApplyThreads": 8,
        "TargetSchema": "",
        "InlineLobMaxSize": 0,
        "ParallelLoadQueuesPerThread": 0,
        "SupportLobs": true,
        "LobChunkSize": 0,
        "TaskRecoveryTableEnabled": false,
        "ParallelLoadThreads": 32,
        "LobMaxSize": 32,
        "BatchApplyEnabled": true,
        "FullLobMode": false,
        "LimitedSizeLobMode": true,
        "LoadMaxFileSize": 0,
        "ParallelLoadBufferSize": 1000
    },
    "BeforeImageSettings": null,
    "ControlTablesSettings": {
        "historyTimeslotInMinutes": 5,
        "HistoryTimeslotInMinutes": 5,
        "StatusTableEnabled": false,
        "SuspendedTablesTableEnabled": false,
        "HistoryTableEnabled": false,
        "ControlSchema": "",
        "FullLoadExceptionTableEnabled": false
    },
    "LoopbackPreventionSettings": null,
    "CharacterSetSettings": null,
    "FailTaskWhenCleanTaskResourceFailed": false,
    "ChangeProcessingTuning": {
        "StatementCacheSize": 50,
        "CommitTimeout": 1,
        "BatchApplyPreserveTransaction": true,
        "BatchApplyTimeoutMin": 60,
        "BatchSplitSize": 0,
        "BatchApplyTimeoutMax": 60,
        "MinTransactionSize": 1000,
        "MemoryKeepTime": 60,
        "BatchApplyMemoryLimit": 500,
        "MemoryLimitTotal": 1024
    },
    "ChangeProcessingDdlHandlingPolicy": {
        "HandleSourceTableDropped": true,
        "HandleSourceTableTruncated": true,
        "HandleSourceTableAltered": true
    },
    "PostProcessingRules": null
}