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  • Decode PLE and Buffer Cache Hit Ratio via cntr_type Codes

    calendar Sep 6, 2026 / Sep 6, 2026 · 10 min read · sql server sys.dm_os_performance_counters page life expectancy buffer cache hit ratio cntr_type buffer manager sys.dm_os_sys_info sys.dm_exec_requests numa monitoring scripts  ·
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    How many seconds should a data page sit in the buffer pool before SQL Server decides it isn't needed anymore, and where does that number actually come from? Page life expectancy is one row among hundreds returned by sys.dm_os_performance_counters, and reading it correctly — along with its neighbor, buffer cache hit …


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  • Decode PLE and Buffer Cache Hit Ratio via cntr_type Codes
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SCRIPTS 71 SQL SERVER MAINTENANCE 14 SQL SERVER ADMINISTRATION 13 SQL SERVER PERFORMANCE 13 SQL SERVER STRUCTURE 11 SQL SERVER MONITORING 10 SQL SERVER BACKUP RECOVERY 7 SQL SERVER SECURITY 3

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SQL SERVER MAINTENANCE 14 SQL SERVER ADMINISTRATION 13 SQL SERVER PERFORMANCE 13 SQL SERVER STRUCTURE 11 SQL SERVER MONITORING 10 SQL SERVER BACKUP RECOVERY 7 SQL SERVER SECURITY 3

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SQL SERVER 70 DATABASE ADMINISTRATION 39 SQL SCRIPTS 39 PERFORMANCE 21 SCRIPTS 21 MAINTENANCE SCRIPTS 19 MONITORING 17 SYS.TABLES 16 SYS.OBJECTS 15 DATABASE MAINTENANCE 13 DBCC COMMANDS 11 SYS.DATABASES 11 MSDB 10 SYS.INDEXES 10
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ACTIVE SESSIONS2 AD HOC QUERIES1 ADMINISTRATION4 ADVANCED OPTIONS1 ALTER INDEX1 ANSI STANDARD1 AUTOMATION2 BACKUP1 BACKUP AUDIT1 BACKUP COMPRESSION1 BACKUP MONITORING2 BACKUP RECOVERY6 BACKUP VALIDATION1 BACKUPSET1 BLOCKING3 BOTTLENECK ANALYSIS1 BUFFER CACHE HIT RATIO1 BUFFER MANAGER1 BUFFER POOL1 CAPACITY PLANNING2 CARDINALITY ESTIMATION1 CATALOG VIEWS6 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 UTILIZATION1 CROSS DATABASE1 CURSOR PROGRAMMING1 DATA AUDIT1 DATA CACHE1 DATA COMPRESSION1 DATA DICTIONARY1 DATA TYPES1 DATABASE1 DATABASE ADMINISTRATION39 DATABASE CONNECTIONS1 DATABASE CORRUPTION2 DATABASE FILES2 DATABASE INTEGRITY1 DATABASE MAIL1 DATABASE MAINTENANCE13 DATABASE MANAGEMENT3 DATABASE MEMORY1 DATABASE MONITORING2 DATABASE OBJECTS1 DATABASE OPTIMIZATION1 DATABASE SCHEMA1 DATABASE SCRIPTS1 DATABASE SECURITY1 DATABASE STRUCTURE9 DBA SCRIPTS9 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 DMV4 DOCUMENTATION1 DUPLICATE INDEXES1 DYNAMIC SQL3 ERROR LOG1 EXECUTION PLAN1 FILEPROPERTY1 FOR SYSTEM_TIME1 FOREIGN KEYS2 FRAGMENTATION2 FULL BACKUP1 GRANT STATEMENTS1 HEAP TABLES2 HISTORY TABLE1 IDENTITY COLUMNS2 IDENTITY RESEED1 IMPACT ANALYSIS1 INDEX FRAGMENTATION2 INDEX MAINTENANCE5 INDEX OPTIMIZATION1 INDEX REBUILDING1 INDEX SIZE1 INDEX TUNING2 INDEXES4 INDEXING1 INFORMATION_SCHEMA2 INFORMATION_SCHEMA.TABLE_CONSTRAINTS1 INFORMATION_SCHEMA.TABLES1 INTEGRITY CHECK2 IO STALL1 JOB MONITORING1 KILL SPID1 LOG MANAGEMENT1 LOGIN MANAGEMENT1 LONG RUNNING TRANSACTIONS1 MAINTENANCE2 MAINTENANCE SCRIPTS19 MAX SERVER MEMORY1 MAXDOP1 MEMORY1 MEMORY CLERKS1 MEMORY CONFIGURATION1 MEMORY PRESSURE1 METADATA7 MISSING INDEXES1 MONITORING17 MSDB10 MSDB.DBO.BACKUPMEDIAFAMILY1 MSDB.DBO.BACKUPSET1 NONCLUSTERED INDEXES1 NUMA2 OBJECT DEPENDENCIES1 OBJECT SEARCH1 OPEN TRANSACTIONS1 OPTIMIZATION2 OPTIMIZE FOR AD HOC WORKLOADS1 ORPHAN USERS1 PAGE COMPRESSION1 PAGE CORRUPTION1 PAGE LIFE EXPECTANCY1 PARAMETER SNIFFING1 PERFORMANCE21 PERFORMANCE MONITORING1 PERFORMANCE TUNING7 PERMISSIONS2 PLAN CACHE4 POINT IN TIME QUERY1 POINT IN TIME RESTORE1 PRIMARY KEYS3 QUERY OPTIMIZATION2 QUERY OPTIMIZER1 QUERY PERFORMANCE1 QUERY STORE2 QUERY TUNING3 REBUILD REORGANIZE1 RECONFIGURE1 RECOVERY1 REFACTORING1 REFERENTIAL INTEGRITY1 REPORTING3 RESTORE1 RESTORE VERIFYONLY1 RING BUFFER1 ROLE MEMBERSHIPS1 ROW COMPRESSION1 SCHEMA ANALYSIS2 SCHEMA AUDIT1 SCHEMA DOCUMENTATION1 SCHEMA MANAGEMENT1 SCRIPTS21 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 SCRIPTS39 SQL SERVER70 SQL SERVER AGENT2 SQL SERVER MONITORING1 SQLSERVER PROCESS UTILIZATION1 STATISTICS2 STORAGE2 STORAGE ERROR1 STORED PROCEDURES1 SUSPECT PAGES1 SYS.ALL_COLUMNS1 SYS.ALL_OBJECTS1 SYS.ALLOCATION_UNITS3 SYS.COLUMNS7 SYS.COMPUTED_COLUMNS1 SYS.CONFIGURATIONS2 SYS.DATABASE_FILES2 SYS.DATABASE_PERMISSIONS1 SYS.DATABASE_PRINCIPALS2 SYS.DATABASE_ROLE_MEMBERS1 SYS.DATABASES11 SYS.DM_DB_INDEX_PHYSICAL_STATS8 SYS.DM_DB_INDEX_USAGE_STATS5 SYS.DM_DB_MISSING_INDEX_DETAILS1 SYS.DM_DB_MISSING_INDEX_GROUP_STATS1 SYS.DM_DB_MISSING_INDEX_GROUPS1 SYS.DM_DB_PARTITION_STATS2 SYS.DM_DB_STATS_PROPERTIES1 SYS.DM_EXEC_CACHED_PLANS2 SYS.DM_EXEC_QUERY_PLAN1 SYS.DM_EXEC_QUERY_STATS1 SYS.DM_EXEC_REQUESTS3 SYS.DM_EXEC_SESSIONS3 SYS.DM_EXEC_SQL_TEXT5 SYS.DM_IO_VIRTUAL_FILE_STATS1 SYS.DM_OS_BUFFER_DESCRIPTORS1 SYS.DM_OS_MEMORY_CLERKS1 SYS.DM_OS_PERFORMANCE_COUNTERS2 SYS.DM_OS_RING_BUFFERS1 SYS.DM_OS_SYS_INFO2 SYS.DM_OS_VOLUME_STATS1 SYS.DM_OS_WAIT_STATS1 SYS.DM_OS_WAITING_TASKS1 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_COLUMNS1 SYS.FOREIGN_KEYS4 SYS.IDENTITY_COLUMNS1 SYS.INDEX_COLUMNS5 SYS.INDEXES10 SYS.KEY_CONSTRAINTS2 SYS.MASTER_FILES3 SYS.OBJECTS15 SYS.PARTITIONS6 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.SCHEMAS7 SYS.SERVER_PRINCIPALS1 SYS.SP_ENUMERRORLOGS1 SYS.SQL_EXPRESSION_DEPENDENCIES1 SYS.SQL_MODULES2 SYS.STATS1 SYS.TABLES16 SYS.TYPES2 SYS.VIEWS1 SYSCOLUMNS1 SYSDATABASES1 SYSINDEXES3 SYSJOBHISTORY1 SYSJOBS1 SYSMAIL_ACCOUNT1 SYSMAIL_ADD_ACCOUNT_SP1 SYSMAIL_EVENT_LOG1 SYSMAIL_MAILITEMS1 SYSMAIL_PROFILE1 SYSOBJECTS10 SYSTEM IDLE PROCESS1 SYSTEM TABLES4 SYSTEM VERSIONING1 T-SQL3 TABLE ANALYSIS1 TABLE INVENTORY1 TABLE MAINTENANCE1 TABLE SIZE1 TABLE STATISTICS1 TEMPDB1 TEMPORAL TABLES1 TRANSACTION LOG3 TRANSACTION LOG BACKUP1 UPDATE STATISTICS2 USECOUNTS1 VIEWS1 VIRTUAL LOG FILES1 WAIT STATISTICS1 WAIT TYPES3 XP_CMDSHELL1 XP_READERRORLOG1 XTP1
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