Recent questions tagged indexing

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indexing - c++ uint , unsigned int , int

Hi I have a program that deals alot with vectors and indexes of the elements of these vectors, and I ... performance is a must have requirement See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - What happens if I drop a MySQL column without dropping its index first?

With one of my MySQL tables, I dropped column col1 before I drop it from a unique index (col0, col1, col2, col3) ... it as (col0, col2, col3)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - Lucene fieldNorm discrepancy between Similarity calculation and query-time value

I'm trying to understand how fieldNorm is calculated (at index time) and then used (and apparentlly re- ... the precision-loss re-calculations? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - Alter Non Clustered Index in SQL Server to Add more included columns

Is it possible to alter an existing non clustered index to include more columns as a part of Covered ... fragmentation or anything else? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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indexing - Snakemake: confusion on how to access config files properly

This question follows on from a question I asked previously and it regards understanding how to access config files correctly ... of the trim_galore_pe rule. As you can see I...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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384 views

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indexing - Snakemake: confusion on how to access config files properly

This question follows on from a question I asked previously and it regards understanding how to access config files correctly ... of the trim_galore_pe rule. As you can see I...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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581 views

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indexing - Index optimization for mongodb aggregation framework

I have a match-unwind-group-sort aggregation pipeline in mongo 2.4.4 and I need to speed up the aggregation ... to focus on index optimization? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - Transpose DataFrame in Pandas while preserving Index column

The problem is, when I transpose the DataFrame, the header of the transposed DataFrame becomes the Index numerical ... to DataFrame with pandas See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - FORCE INDEX in MySQL - where do I put it?

I have the following MySQL query that works perfectly fine. Except that I need to add a FORCE INDEX and I'm ... more complex that I'm missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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425 views

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indexing - PostgreSQL index not used for query on IP ranges

I'm using PostgreSQL 9.2 and have a table of IP ranges. Here's the SQL: CREATE TABLE ips ( id ... index on both begin_ip_num and end_ip_num. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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659 views

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indexing - How to Create a nested index in MongoDB?

A. How do I index nested and all of it's values? B. How do I index valuetwo? { id: 00000, attrs: ... about indexing things that aren't nested. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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indexing - Copy a MySQL table including indexes

I can copy a MySQL table to create a new table: CREATE TABLE newtable SELECT * FROM oldtable This works, but ... a table including the indexes? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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480 views

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indexing - In MySQL, how to build index to speed up this query?

In MySQL, how to build index to speed up this query? SELECT c1, c2 FROM t WHERE c3='foobar'; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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388 views

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indexing - pandas, python - how to select specific times in timeseries

I worked now for quite some time using python and pandas for analysing a set of hourly data and find it quite nice ... no programer :) ... yet See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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indexing - How often should the indexes be rebuilt in our SQL Server database?

Currently our database has size 10 GB and is growing by around 3 GB per month. Often I hear that one ... the indexes in the given scenario? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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565 views

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indexing - How do I check if an index exists on a table field in MySQL?

I've needed to Google this a couple times, so I'm sharing my Q/A. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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392 views

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indexing - Sorted String Table (SSTable) or B+ Tree for a Database Index?

Using two databases to illustrate this example: CouchDB and Cassandra. CouchDB CouchDB uses a B+ Tree for document ... you for the thoughts. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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386 views

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indexing - Difference between local and global indexes in DynamoDB

I'm curious about these two secondary indexes and differences between them. It is hard to imagine how this looks ... more people than just me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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612 views

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indexing - MongoDB index intersection

Hey I want to evaluate the performance of index intersection but I'm not able to get an intersection ... intersection. Thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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484 views

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indexing - Boosting Lucene Terms When Building the Index

Is it possible to determine that specific terms are more important then other when creating the index (not when ... point of view ? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

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indexing - How to use index efficienty in mysql query

My db is running on mysql v5.x. I have a table T1 with 5 columns and column C1 is the primary key. C1 ... So any help will be appreciated. Thx. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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533 views

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indexing - MongoDB Index on different types

We can have { data: "hello" }, { data: 123 } in the same collection and even create a index on it. I ... created but only one index is created. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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431 views

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indexing - In SQL Server, should I create an index for an identity column, or is it created automatically?

I believe when I create an identity column it gets indexed automatically, but I'm not 100% sure. Should I ... or is it created automatically? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

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indexing - Relationship Labels and Index in Neo4J

It's possible to label the nodes in the new Neo4J 2.0.1, but does that same labelling work on relationships? ... ON :TO(statement) Thank you! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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indexing - Get index of string scan results in ruby

I want to get the index as well as the results of a scan "abab".scan(/a/) I would like to have not ... those matches [1, 3] any suggestion? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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493 views

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indexing - MySQL indexes - how many are enough?

I'm trying to fine-tune my MySQL server so I check my settings, analyzing slow-query log, and simplify my ... rows if it only contains 22? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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496 views

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indexing - What are the biggest benefits of using INDEXES in mysql?

I know I need to have a primary key set, and to set anything that should be unique as a unique key, but what ... use them or not, when should I? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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352 views

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indexing - Python list.index throws exception when index not found

Why does list.index throw an exception, instead of using an arbitrary value (for example, -1)? What's the idea ... How about a value of None? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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