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Update Statistics With FULLSCAN and MAXDOP in SQL Server

February 15, 2019
Pinal Dave
SQL Performance
MAXDOP, Parallel, SQL Scripts, SQL Statistics

To update statistics with FULLSCAN in parallel, add MAXDOP to the statement. This post builds a table of 3 million rows, times the update with MAXDOP 1, the instance default and 8, and shows which statistics speed up and which do not.

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An ice resurfacing machine making its last pass across an empty rink while skaters wait at the gate

Tracking Backup Throughput and Duration From msdb History

February 14, 2019
Pinal Dave
SQL Tips and Tricks
DBA, SQL Backup and Restore, SQL Monitoring, SQL System Table

Track backup throughput and duration from msdb history, compare recent trends, and keep striped devices from duplicating backup totals.

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Title card: New Parallel Operation Cannot Be Started

SQL SERVER – New Parallel Operation Cannot be Started Due to Too Many Parallel Operations Executing at this Time

February 13, 2019
Pinal Dave
SQL Tips and Tricks
Parallel, Reporting Services, SQL Backup and Restore, SQL Error Messages, SQL Server

A client’s ERRORLOG said: New parallel operation cannot be started due to too many parallel operations executing at this time. Here is what I found behind it.

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Scheduling Recurring Events: Every Second Tuesday in T-SQL

February 12, 2019
Pinal Dave
SQL Tips and Tricks
SQL DateTime, SQL Function, SQL Scripts, SQL Server

Generate recurring events with stable weekday arithmetic, monthly ranking, and anchored fourteen-day rules instead of endless date rows.

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Cannot drop assembly.

SQL SERVER – Cannot Drop the Assembly ‘ISSERVER’, Because it Does not Exist or You do not Have Permission

February 11, 2019
Pinal Dave
SQL Tips and Tricks
SQL Error Messages, SQL Server, SQL Server Security, SQL Upgrade, SSIS

An upgrade could not start SQL Server: Cannot drop the assembly ‘ISSERVER’, because it does not exist or you do not have permission. Here is another way to fix it.

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Overlapping spool collections are arranged in one compartmented case while a separate order remains apart

What is Consolidation of Index? – Interview Question of the Week #212

February 10, 2019
Pinal Dave
SQL Interview Questions and Answers
SQL Index, SQL Performance, SQL Server

What is consolidation of index? When a table has overlapping indexes, like one on Col1 and one on Col1, Col2, here is how I think about combining them.

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Two alternative measuring jigs remain beside a held joint for a temporary comparison.

SQL SERVER – Enabling Older Legacy Cardinality Estimation

February 9, 2019
Pinal Dave
SQL Tips and Tricks
SQL Scripts, SQL Server, SQL Server Configuration, SQL Statistics

Legacy Cardinality Estimation temporarily stabilized one customer memory-grant problem. A query waited on RESOURCE_SEMAPHORE while the instance became unresponsive.

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