I believe so. After replication is working, you can drop the indexes on the slave and create the indexes you want and that should do it. Since MySQL replicates statements and not data (at least by default), as long as the SQL necessary to insert or update or select from the table doesn’t need to … Read more
#tablename is a physical table, stored in tempdb that the server will drop automatically when the connection that created it is closed, @tablename is a table stored in memory & lives for the lifetime of the batch/procedure that created it, just like a local variable. You can only add a (non PK) index to a … Read more
This is likely not a problem of indexing, but one of data design. Normalization, to be precise. The fact that you need to query distinct values of a field, and even willing to add an index, is a strong indicator that the field should be normalized into a separate table with a (small) join key. … Read more
Using list comprehension and enumerate: >>> x = [ ‘w’, ‘e’, ‘s’, ‘s’, ‘s’, ‘z’,’z’, ‘s’] >>> [i for i, n in enumerate(x) if n == ‘s’][0] 2 >>> [i for i, n in enumerate(x) if n == ‘s’][1] 3 >>> [i for i, n in enumerate(x) if n == ‘s’][2] 4 >>> [i for … Read more
the easiest way to do this would probably be to run the management command directly from python and run it in your task from haystack.management.commands import update_index update_index.Command().handle()
Angular does not provide this functionality out of the box. I think that the simplest way to achieve the desired result is to only display data on every third index like so: <div class=”list-group”> <div *ngFor=”let p of products; let idx = index” > <div class=”row” *ngIf=”idx % 3 === 0″> <app-product [product]=”products[idx]”></app-product> <app-product [product]=”products[idx+1]”></app-product> … Read more
Currently some locale [docs] support can only be set at initdb time, but I think the one relevant to _pattern_ops can be modified via SET at runtime, LC_COLLATE. To see the set values you can use the SHOW command. For example: SHOW LC_COLLATE _pattern_ops indexes are useful in columns that use pattern matching constructs, like … Read more
An expression in an index declaration should be enclosed in additional brackets, try: CREATE INDEX event_creation_time_date_idx ON event ((creation_time::DATE));
Yes, it is. You should query Performance Schema: select * from performance_schema.table_io_waits_summary_by_index_usage where object_schema=”your_schema” The count_star column show how many times each index was used since MySQL was started. If you add the following, you got the never used indexes: and count_star = 0