Whenever you run MQL commands, you are in a micro transaction.
If one of your orders returns an error, all your micro transaction is rollbacked.
The storage system is ACID.

commit rollback transaction logs auto commit set auto commit

commit

Description

To commit the current transaction

admin
word create duck en;<br>commit;<br>word create rabbit en;<br>exception (1) ("here a rollback ...");

mentdb
1: here a rollback ...

admin
node show W[duck]

mentdb
{<br>  "fl": {<br>    "en": {<br>      "ltl": "TH[77]",<br>      "ftl": "TH[77]"<br>    }<br>  },<br>  "w": 1,<br>  "k": "W[duck]"<br>}

admin
node show W[rabbit]

mentdb
Sorry, the node 'W[rabbit]' does not exist.

rollback

Description

To rollback the current transaction

admin
word create wolf en;<br>commit;<br>word create panda en;<br>rollback;

mentdb
Rollback done.

admin
node show W[wolf]

mentdb
{<br>  "fl": {<br>    "en": {<br>      "ltl": "TH[78]",<br>      "ftl": "TH[78]"<br>    }<br>  },<br>  "w": 1,<br>  "k": "W[wolf]"<br>}

admin
node show W[panda]

mentdb
Sorry, the node 'W[panda]' does not exist.

transaction logs <limit>

Description

To show the log block list to replay

Parameters

limit: The limit value - integer >= 0 - required

admin
word create hippo en;<br>env set var "[transaction_logs]" (transaction logs 10;);<br>[transaction_logs]

mentdb
[<br>  "1\tTO_OVERWRITE_COUNTER_INDEX\tIndexFileId:651\tCounter:4",<br>  "2\tTO_SET_OLD_INDEX_BLOCK\tIndexFileId:651\tIndexPosition:104\tDataFileId:-1\tDataPosition:-1",<br>  "3\tTO_DELETE_BLOCK\tDataFileId:0\tPosition:1589248",<br>  "4\tTO_REWRITE_UNUSED\tDataFileId:0\tPosition:1589248",<br>  "5\tTO_DELETE_BLOCK\tDataFileId:0\tPosition:1589504",<br>  "6\tTO_REWRITE_UNUSED\tDataFileId:0\tPosition:1589504",<br>  "7\tTO_OVERWRITE_COUNTER_INDEX\tIndexFileId:651\tCounter:5",<br>  "8\tTO_SET_OLD_INDEX_BLOCK\tIndexFileId:651\tIndexPosition:104\tDataFileId:0\tDataPosition:1589504",<br>  "9\tTO_DELETE_UNUSED\tDataFileId:0\tUnusedLength:8",<br>  "10\tTO_REWRITE_BLOCK\tDataFileId:0\tPosition:1589504\tNextPosition:-1\tData:W1siV1toaXBwb10iLDAsMTU4OTI0OF1d                                                                                                                                                                                                        \tSize:32"<br>]

auto commit set <bool>

Description

To set the auto commit mode

Parameters

bool: The boolean (true|false) - boolean - required

admin
auto commit set false;

mentdb
1

auto commit

Description

To get the auto commit mode

admin
auto commit;