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  • SQL Server Database Schema and Data Dictionary Queries

    calendar Jun 18, 2026 / Sep 22, 2026 · 6 min read · sql server information_schema data dictionary database schema metadata sys.objects sys.columns sys.sql_modules catalog views documentation database structure ansi standard scripts  ·
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    Documenting a database starts with a data dictionary: every table, every column, its data type, length, nullability, and default. SQL Server exposes this through the ANSI-standard INFORMATION_SCHEMA views, which produce a portable schema report that reads almost like English and runs unchanged on other ISO-compliant …


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  • How to Update Statistics in SQL Server

    calendar Jun 17, 2026 / Oct 12, 2026 · 11 min read · sql server update statistics sp_updatestats sys.dm_db_stats_properties sys.stats sys.objects statistics query optimizer maintenance scripts performance cardinality estimation database maintenance scripts  ·
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    Statistics are the optimizer's picture of the data, and that picture ages every time rows change. When a table grows faster than its statistics are refreshed, plans keep being built for the row counts it held weeks ago. Refreshing the statistics is often the fix, and the work is knowing which ones to refresh and with …


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  • sp_pkeys and Primary Key Metadata in SQL Server

    calendar Jun 16, 2026 / Sep 22, 2026 · 7 min read · sql server sp_pkeys sys.key_constraints sys.index_columns sys.columns sys.types sys.tables sys.objects sys.schemas information_schema primary keys catalog views metadata database structure scripts  ·
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    Which columns make up a table's primary key, and in what order are they declared? For a single table, the system stored procedure sp_pkeys answers in one line; for a database-wide inventory, the catalog views behind it give you full control. This post covers both, from the quick lookup to the complete metadata query. …


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  • sysindexes vs sys.indexes: Legacy and Modern Catalog Views

    calendar Jun 15, 2026 / Sep 22, 2026 · 6 min read · sql server sysindexes sys.indexes sys.partitions sys.allocation_units sys.dm_db_partition_stats sys.index_columns sys.objects sys.schemas catalog views compatibility views metadata database structure scripts  ·
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    Plenty of SQL Server scripts still in circulation read rowcnt and dpages straight out of sysindexes — a habit inherited from SQL Server 2000, where that table was the canonical place to find row counts and page totals. The object survives only as the sys.sysindexes compatibility view, is flagged for removal, and …


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  • SQL Server Catalog Views: sys.tables, sys.indexes, sys.objects

    calendar Jun 14, 2026 / Oct 12, 2026 · 9 min read · sql server catalog views system tables metadata sys.tables sys.indexes sys.objects sys.schemas sys.partitions sys.columns sys.index_columns database structure scripts  ·
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    Three catalog views, sys.objects, sys.tables, and sys.indexes, answer most day-to-day questions about what a database contains. This script joins them with sys.schemas and sys.partitions into one inventory: every user table, its schema, its dates, its row count, and each index defined on it. The row count comes from a …


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  • SQL Server DBCC Commands Guide

    calendar Jun 8, 2026 / Oct 16, 2026 · 10 min read · sql server dbcc commands database maintenance database administration maintenance scripts sql scripts consistency checks dbcc checkdb dbcc shrinkfile plan cache sys.dm_exec_requests sys.dm_db_log_space_usage sys.dm_exec_cached_plans sys.dm_exec_input_buffer sys.dm_exec_sql_text  ·
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    An incident rarely announces which DBCC statement it needs. A log file stops truncating, a query slows after a plan changes, an identity column runs ahead of its table, and each one has a Database Console Command that answers it, sitting next to a few that can make the same situation worse. The DBCC statements are …


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  • SQL Server DBCC CHECKDB Guide and Repair Options

    calendar Jun 7, 2026 / Oct 16, 2026 · 10 min read · sql server database corruption consistency checks database maintenance dbcc commands database administration maintenance scripts sql scripts dbcc checkdb sys.databases  ·
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    Running DBCC CHECKDB on a schedule is only the start, because its options change what it checks, how long it takes and what it can do to your data. This post covers the check options, a script that runs the command against every online user database, and the three repair levels, including why REPAIR_ALLOW_DATA_LOSS is …


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  • SQL Server DBCC FREEPROCCACHE: Clear the Plan Cache Safely

    calendar Jun 6, 2026 / Oct 12, 2026 · 9 min read · sql server plan cache query performance parameter sniffing performance tuning database administration sql scripts dbcc commands dbcc freeproccache sys.dm_exec_cached_plans sys.dm_exec_sql_text sys.dm_resource_governor_resource_pools  ·
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    A stored procedure that returned in 20 milliseconds yesterday is timing out today, and nothing in the code changed. Indexes are intact and statistics look current, yet the query now takes a different, slower path. One cause worth checking is a cached plan that was compiled for an unrepresentative set of parameter …


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  • SQL Server DBCC SHRINKDATABASE: When and When Not to Shrink

    calendar Jun 5, 2026 / Oct 16, 2026 · 6 min read · sql server database maintenance index fragmentation disk space database administration maintenance scripts sql scripts dbcc commands DBCC SHRINKFILE sys.database_files sys.dm_db_index_physical_stats sys.indexes  ·
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    A one-time data load doubled a data file overnight, the load is done, the rows are deleted, and the file is now mostly empty space. The reflex — reach for DBCC SHRINKDATABASE and give the disk back — is a common way to hurt performance without meaning to. This post explains what shrinking does to your indexes, when it …


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  • SQL Server DBCC CHECKIDENT: Check and Reseed Identity

    calendar Jun 4, 2026 / Oct 14, 2026 · 7 min read · sql server identity columns database administration maintenance scripts sql scripts dbcc commands table maintenance identity reseed DBCC CHECKIDENT sys.columns sys.identity_columns  ·
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    A logging table grew to forty million rows, the bulk of it was archived out, and now only the last week's data remains — but the next insert still gets identity value 40,000,001, leaving a vast gap below it. Or a botched data load left the seed sitting far above the real maximum, and future inserts skip millions of …


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  • Catch Plan Regressions Automatic Tuning Leaves Uncorrected
  • Audit Per-Database MAXDOP, CE and Sniffing Config Overrides
  • Rank Index Contention with sys.dm_db_index_operational_stats
  • Measure Internal Latch Contention with sys.dm_os_latch_stats
  • Catch Memory Grant Waits via sys.dm_exec_query_memory_grants
  • Spot Low-Memory Conditions with sys.dm_os_process_memory
  • Profile Costly Cached Procs with sys.dm_exec_procedure_stats
  • Check AG Replica Health with sys.dm_hadr_availability_replica_states

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SCRIPTS 82 SQL SERVER PERFORMANCE 18 SQL SERVER ADMINISTRATION 15 SQL SERVER MAINTENANCE 14 SQL SERVER MONITORING 11 SQL SERVER STRUCTURE 11 SQL SERVER BACKUP RECOVERY 10 SQL SERVER SECURITY 3

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SQL SERVER PERFORMANCE 18 SQL SERVER ADMINISTRATION 15 SQL SERVER MAINTENANCE 14 SQL SERVER MONITORING 11 SQL SERVER STRUCTURE 11 SQL SERVER BACKUP RECOVERY 10 SQL SERVER SECURITY 3

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SQL SERVER 80 DATABASE ADMINISTRATION 40 SQL SCRIPTS 40 SCRIPTS 26 PERFORMANCE 21 MAINTENANCE SCRIPTS 20 SYS.OBJECTS 19 MONITORING 18 SYS.TABLES 17 SYS.DATABASES 15 DATABASE MAINTENANCE 14 SYS.INDEXES 13 DBCC COMMANDS 11 PERFORMANCE TUNING 11
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ACTIVE SESSIONS2 AD HOC QUERIES1 ADMINISTRATION4 ADVANCED OPTIONS1 ALTER INDEX1 ALWAYS ON1 ANSI STANDARD1 AUTOMATIC PLAN CORRECTION1 AUTOMATIC TUNING1 AUTOMATION3 AVAILABILITY GROUPS1 BACKUP3 BACKUP AUDIT1 BACKUP COMPRESSION1 BACKUP MONITORING2 BACKUP RECOVERY8 BACKUP VALIDATION1 BACKUPSET1 BLOCKING4 BOTTLENECK ANALYSIS1 BUFFER CACHE HIT RATIO1 BUFFER MANAGER1 BUFFER POOL2 CAPACITY PLANNING2 CARDINALITY ESTIMATION2 CATALOG VIEWS7 CLUSTERED INDEXES1 CNTR_TYPE1 COLUMNS1 COMPATIBILITY VIEWS1 COMPILED PLAN STUB1 CONFIGURATION DRIFT1 CONSISTENCY CHECKS2 CONSTRAINT REPORTING1 CONTENTION1 COPY ONLY BACKUP1 CPU CONFIGURATION1 CPU HISTORY1 CPU TIME1 CPU UTILIZATION1 CROSS DATABASE1 CURSOR PROGRAMMING1 DATA AUDIT1 DATA CACHE1 DATA COMPRESSION1 DATA DICTIONARY1 DATA TYPES1 DATABASE1 DATABASE ADMINISTRATION40 DATABASE CONFIGURATION1 DATABASE CONNECTIONS1 DATABASE CORRUPTION2 DATABASE FILES2 DATABASE INTEGRITY1 DATABASE MAIL1 DATABASE MAINTENANCE14 DATABASE MANAGEMENT2 DATABASE MEMORY1 DATABASE MONITORING2 DATABASE OBJECTS1 DATABASE RECOVERY1 DATABASE ROLES1 DATABASE SCHEMA1 DATABASE SCRIPTS1 DATABASE SECURITY1 DATABASE STRUCTURE9 DBA SCRIPTS10 DBA TOOLS1 DBCC1 DBCC CHECKDB4 DBCC CHECKIDENT2 DBCC COMMANDS11 DBCC DBINFO1 DBCC DBREINDEX2 DBCC FREEPROCCACHE1 DBCC LOGINFO1 DBCC SHRINKFILE2 DEPENDENCIES1 DEV RESTORE1 DIAGNOSTICS1 DIFFERENTIAL BACKUP1 DISK IO1 DISK LATENCY1 DISK SPACE2 DM DB MISSING INDEX DETAILS1 DM DB MISSING INDEX GROUP STATS1 DM DB SESSION SPACE USAGE1 DM EXEC REQUESTS2 DM EXEC SESSIONS3 DM EXEC SQL TEXT1 DM OS WAIT STATS1 DMV6 DOCUMENTATION1 DUPLICATE INDEXES1 DYNAMIC SQL4 ERROR LOG1 EXECUTION PLAN1 EXTENDED EVENTS1 FAILOVER READINESS1 FILEPROPERTY1 FOR SYSTEM_TIME1 FOREIGN KEYS2 FRAGMENTATION2 FULL BACKUP2 GRANT STATEMENTS1 HEAD BLOCKER1 HEAP TABLES2 HISTORY TABLE1 IDENTITY COLUMNS2 IDENTITY RESEED1 IMPACT ANALYSIS1 INDEX FRAGMENTATION2 INDEX MAINTENANCE5 INDEX OPTIMIZATION1 INDEX REBUILDING1 INDEX SIZE1 INDEX TUNING2 INDEXES5 INDEXING1 INFORMATION_SCHEMA2 INFORMATION_SCHEMA.TABLE_CONSTRAINTS1 INFORMATION_SCHEMA.TABLES1 INTEGRITY CHECK2 IO STALL1 JOB MONITORING1 KILL SPID1 LATCH CONTENTION1 LATCHES1 LOCK CONTENTION1 LOG MANAGEMENT1 LOGIN MANAGEMENT1 LONG RUNNING TRANSACTIONS1 LOW MEMORY1 MAINTENANCE2 MAINTENANCE SCRIPTS20 MAX SERVER MEMORY1 MAXDOP2 MEMORY1 MEMORY CLERKS1 MEMORY CONFIGURATION1 MEMORY GRANTS1 MEMORY PRESSURE2 METADATA7 MISSING INDEXES1 MONITORING18 MOVE OPTION1 MSDB10 MSDB.DBO.BACKUPMEDIAFAMILY3 MSDB.DBO.BACKUPSET3 NONCLUSTERED INDEXES1 NORECOVERY1 NUMA2 OBJECT DEPENDENCIES1 OBJECT SEARCH1 OPEN TRANSACTIONS1 OPTIMIZATION2 OPTIMIZE FOR AD HOC WORKLOADS1 ORPHAN USERS1 PAGE COMPRESSION1 PAGE CORRUPTION1 PAGE LIFE EXPECTANCY1 PARAMETER SNIFFING2 PERFORMANCE21 PERFORMANCE MONITORING1 PERFORMANCE TUNING11 PERMISSIONS2 PLAN CACHE5 PLAN REGRESSION1 POINT IN TIME QUERY1 POINT IN TIME RESTORE1 PRIMARY KEYS3 PROCEDURE CACHE1 QUERY OPTIMIZATION2 QUERY OPTIMIZER2 QUERY PERFORMANCE1 QUERY STORE3 QUERY TUNING3 REBUILD REORGANIZE1 RECONFIGURE1 RECOVERY1 REFACTORING1 REFERENTIAL INTEGRITY1 REPORTING3 RESOURCE SEMAPHORE1 RESTORE2 RESTORE DATABASE1 RESTORE FILELISTONLY1 RESTORE VERIFYONLY1 RING BUFFER1 ROLE MEMBERSHIPS1 ROW COMPRESSION1 ROW LOCKS1 SCHEMA ANALYSIS2 SCHEMA AUDIT1 SCHEMA DOCUMENTATION1 SCHEMA MANAGEMENT1 SCRIPTS26 SECURITY4 SECURITY AUDIT2 SERVER MONITORING1 SESSION MANAGEMENT1 SIZE_IN_BYTES1 SP CONFIGURE1 SP_CHANGE_USERS_LOGIN1 SP_CONFIGURE3 SP_EXECUTESQL1 SP_PKEYS2 SP_READERRORLOG1 SP_SEND_DBMAIL1 SP_SPACEUSED1 SP_UPDATESTATS1 SPACE MANAGEMENT1 SPACE USAGE1 SQL1 SQL SCRIPTS40 SQL SERVER80 SQL SERVER 20171 SQL SERVER AGENT2 SQL SERVER MONITORING1 SQL SERVER PERFORMANCE1 SQLSERVER PROCESS UTILIZATION1 STATISTICS2 STORAGE2 STORAGE ERROR1 STORED PROCEDURES2 SUSPECT PAGES1 SYNCHRONIZATION HEALTH1 SYS.ALL_COLUMNS1 SYS.ALL_OBJECTS1 SYS.ALLOCATION_UNITS3 SYS.AVAILABILITY_GROUPS1 SYS.AVAILABILITY_REPLICAS1 SYS.COLUMNS9 SYS.COMPUTED_COLUMNS1 SYS.CONFIGURATIONS6 SYS.DATABASE_FILES3 SYS.DATABASE_PERMISSIONS2 SYS.DATABASE_PRINCIPALS3 SYS.DATABASE_ROLE_MEMBERS1 SYS.DATABASE_SCOPED_CONFIGURATIONS1 SYS.DATABASES15 SYS.DM_DB_FILE_SPACE_USAGE1 SYS.DM_DB_INDEX_OPERATIONAL_STATS1 SYS.DM_DB_INDEX_PHYSICAL_STATS9 SYS.DM_DB_INDEX_USAGE_STATS5 SYS.DM_DB_LOG_SPACE_USAGE1 SYS.DM_DB_MISSING_INDEX_DETAILS1 SYS.DM_DB_MISSING_INDEX_GROUP_STATS1 SYS.DM_DB_MISSING_INDEX_GROUPS1 SYS.DM_DB_PARTITION_STATS3 SYS.DM_DB_STATS_PROPERTIES1 SYS.DM_DB_TUNING_RECOMMENDATIONS1 SYS.DM_DB_XTP_TABLE_MEMORY_STATS1 SYS.DM_EXEC_CACHED_PLANS3 SYS.DM_EXEC_CONNECTIONS2 SYS.DM_EXEC_INPUT_BUFFER1 SYS.DM_EXEC_PLAN_ATTRIBUTES1 SYS.DM_EXEC_PROCEDURE_STATS1 SYS.DM_EXEC_QUERY_MEMORY_GRANTS1 SYS.DM_EXEC_QUERY_PLAN2 SYS.DM_EXEC_QUERY_RESOURCE_SEMAPHORES1 SYS.DM_EXEC_QUERY_STATS3 SYS.DM_EXEC_REQUESTS5 SYS.DM_EXEC_SESSIONS4 SYS.DM_EXEC_SQL_TEXT8 SYS.DM_EXEC_TEXT_QUERY_PLAN1 SYS.DM_HADR_AVAILABILITY_GROUP_STATES1 SYS.DM_HADR_AVAILABILITY_REPLICA_STATES1 SYS.DM_HADR_DATABASE_REPLICA_CLUSTER_STATES1 SYS.DM_HADR_DATABASE_REPLICA_STATES1 SYS.DM_IO_VIRTUAL_FILE_STATS1 SYS.DM_OS_BUFFER_DESCRIPTORS1 SYS.DM_OS_LATCH_STATS1 SYS.DM_OS_MEMORY_CLERKS3 SYS.DM_OS_PERFORMANCE_COUNTERS2 SYS.DM_OS_PROCESS_MEMORY1 SYS.DM_OS_RING_BUFFERS1 SYS.DM_OS_SCHEDULERS1 SYS.DM_OS_SYS_INFO8 SYS.DM_OS_SYS_MEMORY1 SYS.DM_OS_VOLUME_STATS1 SYS.DM_OS_WAIT_STATS4 SYS.DM_OS_WAITING_TASKS1 SYS.DM_PDW_NODES_EXEC_PROCEDURE_STATS1 SYS.DM_PDW_NODES_OS_LATCH_STATS1 SYS.DM_RESOURCE_GOVERNOR_RESOURCE_POOLS1 SYS.DM_SERVER_SERVICES1 SYS.DM_SQL_REFERENCED_ENTITIES1 SYS.DM_SQL_REFERENCING_ENTITIES1 SYS.DM_TRAN_ACTIVE_TRANSACTIONS2 SYS.DM_TRAN_LOCKS1 SYS.DM_TRAN_SESSION_TRANSACTIONS1 SYS.FOREIGN_KEY_COLUMNS2 SYS.FOREIGN_KEYS3 SYS.IDENTITY_COLUMNS2 SYS.INDEX_COLUMNS7 SYS.INDEXES13 SYS.KEY_CONSTRAINTS3 SYS.LOGIN_TOKEN1 SYS.MASTER_FILES4 SYS.MESSAGES1 SYS.OBJECTS19 SYS.PARTITIONS9 SYS.PROCEDURES1 SYS.QUERY_STORE_PLAN1 SYS.QUERY_STORE_QUERY1 SYS.QUERY_STORE_QUERY_TEXT1 SYS.QUERY_STORE_RUNTIME_STATS1 SYS.QUERY_STORE_RUNTIME_STATS_INTERVAL1 SYS.SCHEMAS9 SYS.SERVER_EVENT_SESSIONS1 SYS.SERVER_PRINCIPALS3 SYS.SP_ENUMERRORLOGS1 SYS.SQL_EXPRESSION_DEPENDENCIES1 SYS.SQL_MODULES2 SYS.STATS1 SYS.TABLES17 SYS.TYPES2 SYS.VIEWS1 SYSCOLUMNS1 SYSDATABASES1 SYSINDEXES3 SYSJOBHISTORY1 SYSJOBS1 SYSMAIL_ADD_ACCOUNT_SP1 SYSMAIL_ALLITEMS1 SYSMAIL_EVENT_LOG1 SYSOBJECTS10 SYSTEM IDLE PROCESS1 SYSTEM TABLES4 SYSTEM VERSIONING1 T-SQL2 TABLE ANALYSIS1 TABLE INVENTORY1 TABLE MAINTENANCE1 TABLE SIZE1 TABLE STATISTICS1 TEMPDB1 TEMPORAL TABLES1 TRANSACTION LOG4 TRANSACTION LOG BACKUP1 TSQL1 UPDATE STATISTICS2 USECOUNTS1 VIEWS1 VIRTUAL LOG FILES1 WAIT STATISTICS2 WAIT TYPES3 XP_CMDSHELL1 XP_READERRORLOG1 XTP1
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