CN109408480B - SCN alignment reading method and system based on ORACLE multi-node RAC log - Google Patents
SCN alignment reading method and system based on ORACLE multi-node RAC log Download PDFInfo
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Abstract
A method for reading RACN alignment based on ORACLE multi-node RAC logs comprises the following steps: s1, establishing a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values; s2, reading the logs on each RAC node, when the logs are read, every time when the log set is full of a timestamp, sorting according to the SCN value, adding the sorted logs into the SCN linked list created in the step S1, setting the node mask mark corresponding to the maximum SCN value in the SCN linked list, wherein the SCN value is less than or equal to the SCN sequence, and marking that the logs corresponding to the SCN on the node are completely read; and S3, when the mark mask setting read on the first SCN node of the SCN linked list is found to contain all RAC nodes, picking the log data corresponding to the SCN node from the SCN linked list, analyzing the log and sending the log to the destination terminal.
Description
Technical Field
The invention relates to the technical field of databases, in particular to a method and a system for reading RAC logs based on SCN alignment based on ORACLE.
Background
ORACLE RAC is composed of two or more instances and shares database data files in the same storage; when the RAC-based heterogeneous synchronization is built, the traditional method necessarily requires that the system time between the nodes is aligned, because when each RAC node log is extracted, the logs on each node need to be aligned based on the time stamps, the logs with the same time stamps between the nodes are combined together and then are sequenced according to the SCN, and then the log analysis can be carried out. However, any instance in each RAC cluster has its own separate log management system and is on a different physical server, and each has a different system time. As shown in fig. 1, when the time synchronization service is not deployed or the system time between nodes has an error, how to sort the logs in the logs between the nodes to obtain an accurate transaction execution sequence becomes a problem to be solved when the RAC database is synchronized to another database management system (heterogeneous database synchronization system).
Disclosure of Invention
In view of this, the present invention provides a method and a system for reading an raclog based on the ORACLE multi-node based on SCN alignment.
A method for reading RACN alignment based on ORACLE multi-node RAC logs comprises the following steps:
s1, establishing a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values;
s2, reading the logs on each RAC node, when the logs are read, every time when the log set is full of a timestamp, sorting according to the SCN value, adding the sorted logs into the SCN linked list created in the step S1, setting the node mask mark corresponding to the maximum SCN value in the SCN linked list, wherein the SCN value is less than or equal to the SCN sequence, and marking that the logs corresponding to the SCN on the node are completely read;
and S3, when the mark mask setting read on the first SCN node of the SCN linked list is found to contain all RAC nodes, picking the log data corresponding to the SCN node from the SCN linked list, analyzing the log and sending the log to the destination terminal.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S1 includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S2 includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S3 includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
judging whether the mask mark of the first SCN node of the SCN linked list is completely set, if not, continuing to monitor the state change of the SCN linked list, and if so, entering the next step;
deleting a first SCN node from the SCN linked list;
and sending the deleted SCN node to a destination terminal after log analysis.
The invention also provides a system for reading RAC logs based on SCN alignment based on ORACLE multi-node RAC, which comprises the following steps:
the chain table creating unit is used for creating a combined SCN chain table, and the SCN chain table comprises SCN values and node mask marks corresponding to the SCN values;
the sequencing unit is used for reading the thread of the log on each RAC node, when the log is read, every time a time stamp is filled in the log set, the log is sequenced according to the SCN value, the sequenced log is added into the SCN linked list established in the linked list establishing unit, all SCN values in the SCN linked list are less than or equal to the maximum SCN value in the SCN sequence, the node mask mark is correspondingly set, and the fact that the log corresponding to the SCN on the node is read is marked;
and the analysis sending unit is used for picking the log data corresponding to the SCN node from the SCN linked list and carrying out log analysis and sending the log data to the destination terminal when the read mark mask setting on the first SCN node of the SCN linked list is found to contain all RAC nodes.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the linked list creation unit includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the sorting unit includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the analysis transmission unit includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
judging whether the mask mark of the first SCN node of the SCN linked list is completely set, if not, continuing to monitor the state change of the SCN linked list, and if so, entering the next step;
deleting a first SCN node from the SCN linked list;
and sending the deleted SCN node to a destination terminal after log analysis.
Compared with the prior art, the method and the system for reading RAC logs based on the ORACLE and based on SCN alignment have the following beneficial effects:
the technical problem of how to order the logs in the logs between the nodes to obtain an accurate transaction execution sequence under the condition that the time synchronization service is not deployed or the system time between the nodes has errors can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of system time misalignment between nodes when a heterogeneous synchronization building of RAC in the prior art is performed;
FIG. 2 is a flow chart of a method for reading based on SCN alignment based on ORACLE multi-node RAC log.
Detailed Description
As shown in fig. 2, a method for reading based on SCN alignment based on ORACLE multi-node RAC log includes the following steps:
s1, establishing a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values;
a merged SCN linked list is created to merge the logs of multiple RAC nodes, where the SCN values must be in strict ascending sequence, and node mask marks are used to record which nodes correspond to the SCN logs that have been read.
S2, reading the logs on each RAC node by the thread, and when the logs are read, sorting the logs according to the SCN value (setting the maximum SCN value in the SCN sequence as SCN) when the log set is full of a timestampmax) Adding the sorted log into the SCN linked list created in step S1, and making all SCNs in the SCN linked list less than or equal to SCNmaxCorrespondingly setting the node mask mark to mark that the log corresponding to the SCN on the node is read;
remarking: all log sets of one time stamp full, i.e. the completion time data _ time of the next operation has changed, the same operation completion time.
It is particularly noted that the log of each RAC node needs to be added to the SCN linked list in a manner of SCN sequence increase before being merged into the SCN linked list; and, when a certain SCN value SCN of the nodeXAfter entering the SCN linked list, all SCN values in the SCN linked list need to be smaller than the SCNXAnd correspondingly setting the read mask mark of the node SCN.
And S3, when the mark mask setting read on the first SCN node of the SCN linked list is found to contain all RAC nodes, picking the log data corresponding to the SCN node from the SCN linked list, analyzing the log and sending the log to the destination terminal.
In the embodiment of the invention, the real-time database synchronization system with the RAC as the source end at least comprises a log capture module, a transmission module and an execution module, wherein the log capture module also comprises reading and analyzing functions. The embodiment is mainly applied to RAC log analysis, the change date and time identified in the RAC log is used as a merging mark, the merging mark is sorted according to SCN, and finally the sorted log is used for database synchronization.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S1 includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S2 includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the step S3 includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
interpreting first SCN node of SCN linked list (SCN)min) If the mask mark is completely set, if not, the SCN linked list is continuously monitoredChanging the state, and entering the next step if the state is changed;
deleting the first SCN node (SCN) from the SCN linked listmin)；
And sending the deleted SCN node to a destination terminal after log analysis.
The invention also provides a system for reading RAC logs based on SCN alignment based on ORACLE multi-node RAC, which comprises the following steps:
the chain table creating unit is used for creating a combined SCN chain table, and the SCN chain table comprises SCN values and node mask marks corresponding to the SCN values;
the sequencing unit is used for reading the thread of the log on each RAC node, when the log is read, every time a time stamp is filled in the log set, the log is sequenced according to the SCN value, the sequenced log is added into the SCN linked list established in the linked list establishing unit, all SCN values in the SCN linked list are less than or equal to the maximum SCN value in the SCN sequence, the node mask mark is correspondingly set, and the fact that the log corresponding to the SCN on the node is read is marked;
and the analysis sending unit is used for picking the log data corresponding to the SCN node from the SCN linked list and carrying out log analysis and sending the log data to the destination terminal when the read mark mask setting on the first SCN node of the SCN linked list is found to contain all RAC nodes.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the linked list creation unit includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the sorting unit includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
In the method for reading based on SCN alignment of the ORACLE multi-node RAC log according to the invention,
the analysis transmission unit includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
judging whether the mask mark of the first SCN node of the SCN linked list is completely set, if not, continuing to monitor the state change of the SCN linked list, and if so, entering the next step;
deleting a first SCN node from the SCN linked list;
and sending the deleted SCN node to a destination terminal after log analysis.
Compared with the prior art, the method and the system for reading RAC logs based on the ORACLE and based on SCN alignment have the following beneficial effects:
the technical problem of how to order the logs in the logs between the nodes to obtain an accurate transaction execution sequence under the condition that the time synchronization service is not deployed or the system time between the nodes has errors can be effectively solved.
It is understood that various other changes and modifications may be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.
Claims (8)
1. A method for reading RACN-based alignment of RAC logs based on ORACLE is characterized by comprising the following steps:
s1, establishing a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values;
s2, reading the logs on each RAC node, when the logs are read, every time when the log set is full of a timestamp, sorting according to the SCN value, adding the sorted logs into the SCN linked list created in the step S1, setting the node mask mark corresponding to the maximum SCN value in the SCN linked list, wherein the SCN value is less than or equal to the SCN sequence, and marking that the logs corresponding to the SCN on the node are completely read;
and S3, when the mask mark setting read on the first SCN node of the SCN linked list is found to contain all RAC nodes, picking the log data corresponding to the SCN node from the SCN linked list, analyzing the log and sending the log to the destination terminal.
2. The ORACLE multi-node RAC log based on SCN aligned reading method of claim 1,
the step S1 includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
3. The ORACLE multi-node RAC log based on SCN aligned reading method of claim 2,
the step S2 includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
4. The ORACLE multi-node RAC log based on SCN aligned reading method of claim 2,
the step S3 includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
judging whether the mask mark of the first SCN node of the SCN linked list is completely set, if not, continuing to monitor the state change of the SCN linked list, and if so, entering the next step;
deleting a first SCN node from the SCN linked list;
and sending the deleted SCN node to a destination terminal after log analysis.
5. A system based on SCN alignment reading of ORACLE multi-node RAC logs is characterized by comprising the following steps:
the chain table creating unit is used for creating a combined SCN chain table, and the SCN chain table comprises SCN values and node mask marks corresponding to the SCN values;
the sequencing unit is used for reading the thread of the log on each RAC node, when the log is read, every time a time stamp is filled in the log set, the log is sequenced according to the SCN value, the sequenced log is added into the SCN linked list established in the linked list establishing unit, all SCN values in the SCN linked list are less than or equal to the maximum SCN value in the SCN sequence, the node mask mark is correspondingly set, and the fact that the log corresponding to the SCN on the node is read is marked;
and the analysis sending unit is used for picking the log data corresponding to the SCN node from the SCN linked list and carrying out log analysis and sending the log data to the destination terminal when the fact that the mask mark setting read on the first SCN node of the SCN linked list contains all RAC nodes is found.
6. The ORACLE multi-node RAC log based SCN-aligned read system of claim 5,
the linked list creation unit includes:
respectively deploying a database synchronization system at a source end and a destination end, wherein the source end is deployed at only one node of the RAC;
and creating a combined SCN linked list, wherein the SCN linked list comprises SCN values and node mask marks corresponding to the SCN values, and the SCN values are arranged in sequence.
7. The ORACLE multi-node RAC log based SCN-aligned read system of claim 6,
the sorting unit includes:
generating a log reading thread corresponding to each RAC node, and reading the log of each RAC node;
judging whether the log of each RAC node is full of a timestamp, namely reading until the time change of the next log operation is finished;
each RAC node sorts the logs finished by the same timestamp according to the SCN value;
each RAC node adds the sorted logs into the SCN linked list and sets the mask marks read by the respective node on the SCN value.
8. The ORACLE multi-node RAC log based SCN-aligned read system of claim 7,
the analysis transmission unit includes:
adding the sequenced logs into the SCN linked list through each RAC node, and setting mask marks read by the respective nodes on the SCN value to cause the state of the SCN linked list to be changed;
judging whether the mask mark of the first SCN node of the SCN linked list is completely set, if not, continuing to monitor the state change of the SCN linked list, and if so, entering the next step;
deleting a first SCN node from the SCN linked list;
and sending the deleted SCN node to a destination terminal after log analysis.
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