System, method and computer program product for conditionally performing garbage collection
View Patent ↗In accordance with embodiments, there are provided mechanisms and methods for conditionally performing garbage collection. These mechanisms and methods for conditionally performing garbage collection include identifying a predetermined portion of memory within a system, comparing one or more aspects of the predetermined portion of memory to a threshold, and conditionally performing garbage collection on the predetermined portion of memory, based on the comparison.
1. A non-transitory computer readable medium having stored therein computer code adapted to be executed by a computer to perform operations comprising:
instantiating a plurality of database objects in a portion of memory of a multi-tenant database, wherein the plurality of database objects are owned by a plurality of tenants of the multi-tenant database and correspond to a plurality of applications having access to the multi-tenant database, and wherein the plurality of database objects includes a first database object corresponding to a database table that has first data accessible by a first tenant but not a second tenant and that has second data accessible by the second tenant but not the first tenant;
dynamically creating a threshold value based on a permissible occupancy level of the portion of memory of the multi-tenant database;
comparing to the threshold value an amount of free memory within the portion of memory of the multi-tenant database that is not currently assigned to any of the plurality of tenants of the multi-tenant database; and
upon determining that the amount of free memory within the portion of memory of the multi-tenant database meets the threshold value, performing garbage collection on the portion of memory of the multi-tenant database.
2. The non-transitory computer readable medium of claim 1 , wherein each row in the database table corresponds to a particular one of the plurality of tenants of the multi-tenant database.
3. The non-transitory computer readable medium of claim 1 , wherein data currently being used by the plurality of applications is stored in one or more available locations within the portion of the memory.
4. The non-transitory computer readable medium of claim 1 , wherein data included in the first database object includes metadata.
5. The non-transitory computer readable medium of claim 1 , wherein the operations further comprise determining a current occupancy level of the portion of memory.
6. The non-transitory computer readable medium of claim 1 , wherein the threshold value includes a percentage value.
7. The non-transitory computer readable medium of claim 1 , wherein the threshold value is based on a predetermined amount of free memory within the portion of memory.
8. The non-transitory computer readable medium of claim 1 , wherein performing garbage collection on the portion of memory includes retrieving contents of the portion of memory.
9. The non-transitory computer readable medium of claim 1 , wherein performing garbage collection on the portion of memory includes determining, for each location of the portion of memory, whether that location is currently allocated.
10. The non-transitory computer readable medium of claim 9 , wherein upon determining that a location of memory is deallocated, no action is performed in association with that location.
11. The non-transitory computer readable medium of claim 9 , wherein upon determining that a location of memory is allocated, one or more additional actions are performed in association with that location.
12. The non-transitory computer readable medium of claim 11 , wherein the one or more additional actions include determining whether data currently being used by one or more applications running within the multi-tenant database is stored in that particular location.
13. The non-transitory computer readable medium of claim 12 , wherein when it is determined for the particular location that the data stored in that location is not currently being used by one or more applications running within the multi-tenant database, that location is deallocated and returned to available memory.
14. A method, comprising:
instantiating, by a computer system, a plurality of database objects in a portion of memory of a multi-tenant database, wherein the plurality of database objects are owned by a plurality of tenants of the multi-tenant database and correspond to a plurality of applications having access to the multi-tenant database, and wherein the plurality of database objects includes a first database object corresponding to a database table that has first data accessible by a first tenant but not a second tenant and that has second data accessible by the second tenant but not the first tenant;
determining, by the computer system, a current occupancy level of the portion of memory of the multi-tenant database based on metadata relating to the plurality of tenants of the multi-tenant database;
dynamically creating a threshold value based on a permissible occupancy level of the portion of memory of the multi-tenant database;
based on a comparison of the current occupancy level with the dynamically created threshold value performing garbage collection on the portion of memory of the multi-tenant database.
15. An apparatus, comprising:
a processor; and
a non-transitory memory having stored thereon instructions configured to be executed by the processor to cause the apparatus to perform operations comprising:
instantiating a plurality of database objects in a portion of memory of a multi-tenant database, wherein the plurality of database objects are owned by a plurality of tenants of the multi-tenant database and correspond to a plurality of applications having access to the multi-tenant database, and wherein the plurality of database objects includes a first database object corresponding to a database table that has first data accessible by a first tenant but not a second tenant and that has second data accessible by the second tenant but not the first tenant;
dynamically creating a threshold value based on a permissible occupancy level of the portion of memory of the multi-tenant database;
comparing to the threshold value an amount of free memory within the portion of memory of the multi-tenant database that is not currently assigned to any of the plurality of tenants of the multi-tenant database; and
upon determining that the amount of free memory within the portion of memory of the multi-tenant database meets the threshold value, performing garbage collection on the portion of memory of the multi-tenant database.