Influence of number of indexes on a table
Influence of number of indexes on a table
(OP)
I'm asking myself if there is a limitation about the number of indexes created on a table ?
What kind of influence on the performance may this have.
For example we have a table with 6M records and 15 indexes.
I'm asking myself if it is a good idea to create a new one to speed up a specific transaction or is it useless ?
What kind of influence on the performance may this have.
For example we have a table with 6M records and 15 indexes.
I'm asking myself if it is a good idea to create a new one to speed up a specific transaction or is it useless ?
Talk To Other Members
RE: Influence of number of indexes on a table
Concerning performance: why don't you setup a testszenario and measure the difference?
It is obvious, that a properly constructed index will speed up your query significantly. An additional index has to be managed by the databasesystem and thus creates a certain update-workload when writes are done into that table. You have to find out and decide, if you can notice any major speedimpact in writeoperations.
YOu could also analyse the existing indexes and find out, if there is a way to optimize them. Indexes are evaluated from left to right, so sometimes it is possible to merge indexes, because they both contain certain columns, without having any impact on readoperations.