redshift | Transition-based statistical parser
kandi X-RAY | redshift Summary
kandi X-RAY | redshift Summary
Transition-based statistical parser
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redshift Key Features
redshift Examples and Code Snippets
Community Discussions
Trending Discussions on redshift
QUESTION
Im trying to get the first 2 names in the following example json, without having to call them
test.json
...ANSWER
Answered 2021-Jun-15 at 15:44You can use the keys
function as in:
QUESTION
I have an Aurora Serverless instance which has data loaded across 3 tables (mixture of standard and jsonb data types). We currently use traditional views where some of the deeply nested elements are surfaced along with other columns for aggregations and such.
We have two materialized views that we'd like to send to Redshift. Both the Aurora Postgres and Redshift are in Glue Catalog and while I can see Postgres views as a selectable table, the crawler does not pick up the materialized views.
Currently exploring two options to get the data to redshift.
- Output to parquet and use copy to load
- Point the Materialized view to jdbc sink specifying redshift.
Wanted recommendations on what might be most efficient approach if anyone has done a similar use case.
Questions:
- In option 1, would I be able to handle incremental loads?
- Is bookmarking supported for JDBC (Aurora Postgres) to JDBC (Redshift) transactions even if through Glue?
- Is there a better way (other than the options I am considering) to move the data from Aurora Postgres Serverless (10.14) to Redshift.
Thanks in advance for any guidance provided.
...ANSWER
Answered 2021-Jun-15 at 13:51Went with option 2. The Redshift Copy/Load process writes csv with manifest to S3 in any case so duplicating that is pointless.
Regarding the Questions:
N/A
Job Bookmarking does work. There is some gotchas though - ensure Connections both to RDS and Redshift are present in Glue Pyspark job, IAM self ref rules are in place and to identify a row that is unique [I chose the primary key of underlying table as an additional column in my materialized view] to use as the bookmark.
Using the primary key of core table may buy efficiencies in pruning materialized views during maintenance cycles. Just retrieve latest bookmark from cli using
aws glue get-job-bookmark --job-name yourjobname
and then just that in the where clause of the mv aswhere id >= idinbookmark
conn = glueContext.extract_jdbc_conf("yourGlueCatalogdBConnection")
connection_options_source = { "url": conn['url'] + "/yourdB", "dbtable": "table in dB", "user": conn['user'], "password": conn['password'], "jobBookmarkKeys":["unique identifier from source table"], "jobBookmarkKeysSortOrder":"asc"}
datasource0 = glueContext.create_dynamic_frame.from_options(connection_type="postgresql", connection_options=connection_options_source, transformation_ctx="datasource0")
That's all, folks
QUESTION
I wrote the following query in presto,which gave the error :line 25:8: Column 'flag1' cannot be resolved. The flag condition has to be incorporated. I had run a similar query on redshift without any issue.
...ANSWER
Answered 2021-Jun-08 at 06:11Consider changing WHERE flag1 = 'New'
to WHERE date_diff ('day',fod,dt) <= 28
QUESTION
To begin with, I am very new to coding, so sorry in advance if it is not worth attention.
I work with one to many relationship. Let's say I have a Parent class and a Child class defined as follows:
...ANSWER
Answered 2021-Jun-07 at 16:57Try Query.union
.
Example: verbatim from the documentaion:
QUESTION
I am using listagg to group users having same permissions, based on the query from the below stack question, tweaked it a bit for my needs. How do I view grants on Redshift
This fails saying listagg is compute node function and should be used on user created table. Any way to use listagg on catalog tables and has_*_privilege function both of which runs on leader node?
...ANSWER
Answered 2021-Jun-07 at 11:35No.
As you have correctly understood, listagg
is a function implemented by Redshift, rather than being inherited from Postgres/Paraccel, and it has been implemented only on the worker nodes.
The has
function is from Postgres, and is implemented only on the leader-node.
The query planner will not permit a query using a leader-node only function to recruit worker nodes, so you cannot call listagg
.
(BTW, if I remember correctly, that 'v' for reltype is also going to pick up materialized views.)
As an aside, you can in fact obtain the information you are looking for directly from the system tables, but this is a long and complex undertaking. I am a Redshift specialist and it took me two months for the first version, although I was working at the time.
QUESTION
We're complementing null value to all zero value like '00' on Redshift. Sometimes, I found coalesce function can't work as we expected. If we use case and len, it can work fine as follows;
...ANSWER
Answered 2021-Jun-06 at 02:29There is a difference between ''
and NULL
-- and I should note that this is expected.
You can solve this in one of two ways:
QUESTION
I have identified the below script as being really useful for anyone running Amazon Redshift:
...ANSWER
Answered 2021-Jun-03 at 17:10How about creating a new custom operator? It should accept all the cli arguments and then you can pass them to code from existing script. Here is some rough draft of what I would do:
QUESTION
I am trying to pass the params in postgres operator, in a dynamic way.
There are two tasks in order to refresh the metadata,
get list of id (get_query_id_task)
pass the list of ids to get and execute the query ( get_query_text_task)
...
ANSWER
Answered 2021-May-27 at 17:26params
argument is not "Templated", so it would only render strings. So move your param
directly to SQL
QUESTION
ANSWER
Answered 2021-May-26 at 14:52To use Variable you could use DECLARE
QUESTION
I am attempting to load S3 data info Redshift using an S3 access point (as opposed to a bucket). When I perform the COPY command, I receive an invalid bucket error. It works fine to load from a bucket directly, but when I use an access point ARN as a bucket, I get the error. I'm guessing that it's simply not supported, but hopefully there's something I can do.
...ANSWER
Answered 2021-May-20 at 05:07I suspect that this probably won't work.
My reasoning is that I know that Amazon Redshift can load data from Amazon S3 even when the Redshift cluster is in a private subnet and there is no NAT server. Thus, Redshift has its "own connection" to S3 in the backplane, rather than going through the VPC.
Since the S3 Access Point exists only in a VPC, Redshift would not be able to use the Access Point.
(I look forward to being corrected if anyone knows better!)
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install redshift
You can use redshift like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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