Catalog Cache Hitrate - Low hit rate in the catalog cache (76.170000% 80.

HI...
LC10
in Alert Display CCMS Monitoring architecture
We get error as
Context : MaxDB Monitoring: LCA
Caches : Caches
Short Name : Catalog Cache Hitrate
Alert Text : Low hit rate in the catalog cache (76.170000% < 80.000000%)
Rgds
PR
**http://maxdb.sap.com/doc/7_7/45/748f0f12e14022e10000000a1553f6/content.htm*

Hello,
1. I recommend to create the SAP message & get SAP support.
2. It will be helpful to know the SAP basis SP on your system and the liveCache version you are currently using,
    also what liveCache applications were running at the time when this Alert reported.
3. In general the information is available at MAXDB library:
    http://maxdb.sap.com/doc/7_7/default.htm
    Tools
    Database Analyzer
    Database Analyzer Messages
    Catalog Cache Hit Rate
Regards, Natalia Khlopina

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Hi,
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Cache Sizes
Size in KB Size in pages
I/O Buffer Cache 3,353,808 419,226
Data Cache 3,351,552 418,944
Converter 1,952 244
Other 304 38
Catalog Cache 35,328 4,416
Sequence Cache 8 1
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Accesses Successful Unsuccessful Hit Rate
Entire Data Cache 210,815,372 210,739,279 76,093 99.96%
History/Undo 20,076,913 20,076,913 0 100.00%
OMS Data 158,934,232 158,861,439 72,793 99.95%
SQL Data 31,804,227 31,800,927 3,300 99.99%
Catalog Cache 20,212,459 16,282,442 3,928,363 80.56%
Sequence Cache 0 0 0 100.00%
Data Cache Usage
Usage in KB Usage in Pages Occup.
Entire Data Cache 1,386,752 173,344 41.38%
SQL Data 30,432 3,804 0.91%
OMS Data 722,328 90,291 21.55%
History/Undo 633,816 79,227 18.91%
Cache-Specific Parameter Settings
CACHE_SIZE = 419226
CAT_CACHE_SUPPLY = 4416
Let me know what your comments and suggestions.
Thanks in advance.
Best regards,
Kris Caldoza

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Parameter / Time                         New Value
|--   ALLOW_MULTIPLE_SERVERTASK_UKTS   NO
|--   AUTO_RECREATE_BAD_INDEXES        NO
|--   BACKUP_BLOCK_CNT                 8
|--   CACHE_IN_SHARED_MEMORY           NO
|--   CACHE_SIZE                       419226
|--   CAT_CACHE_SUPPLY                 4416
|--   CHECK_TABLE_WIDTH                NO
|--   CONTROLUSERID                    CONTROL
|--   CONVERTER_REGIONS                8
|--   DATA_VOLUME_GROUPS               1
|--   DATA_VOLUME_NAME_0001            /sapdb/LCP/sapdata/DISKD0001
|--   DATA_VOLUME_NAME_0002            /sapdb/LCP/sapdata/DISKD0002
|--   DATA_VOLUME_SIZE_0001            1024000
|--   DATA_VOLUME_SIZE_0002            512000
|--   DATA_VOLUME_TYPE_0001            L
|--   DATA_VOLUME_TYPE_0002            L
|--   DATE_TIME_FORMAT                 INTERNAL
|--   DEADLOCK_DETECTION               0
|--   DEFAULT_CODE                     ASCII
|--   DIAG_HISTORY_NUM                 2
|--   DIAG_HISTORY_PATH                /sapdb/data/wrk/LCP/DIAGHISTORY
|--   EXPAND_COM_TRACE                 NO
|--   EXTERNAL_DUMP_REQUEST            NO
|--   FBM_VOLUME_BALANCE               10
|--   FBM_VOLUME_COMPRESSION           50
|--   FORBID_LOAD_BALANCING            NO
|--   FORMATTING_MODE                  PARALLEL
|--   FORMAT_DATAVOLUME                YES
|--   HASHED_RESULTSET                 NO
|--   HASHED_RESULTSET_CACHESIZE       262144
|--   HEAP_CHECK_LEVEL                 0
|--   HS_STORAGE_DLL                   libhsscopy
|--   HS_SYNC_INTERVAL                 50
|--   INIT_ALLOCATORSIZE               262144
|--   INSTANCE_TYPE                    LVC
|--   JOIN_MAXTAB_LEVEL4               64
|--   JOIN_MAXTAB_LEVEL9               5
|--   JOIN_OPERATOR_IMPLEMENTATION     NO
|--   JOIN_SEARCH_LEVEL                0
|--   JOIN_TABLEBUFFER                 128
|--   KERNELDIAGSIZE                   800
|--   KERNELTRACESIZE                  1197
|--   KERNELVERSION                    KERNEL    7.5.0    BUILD 035-123-123-944
|--   LOAD_BALANCING_CHK               0
|--   LOAD_BALANCING_DIF               10
|--   LOAD_BALANCING_EQ                5
|--   LOCAL_REDO_LOG_BUFFER_SIZE       0
|--   LOG_BACKUP_TO_PIPE               NO
|--   LOG_IO_QUEUE                     66
|--   LOG_MIRRORED                     NO
|--   LOG_SEGMENT_SIZE                 170666
|--   LOG_VOLUME_NAME_001              /sapdb/LCP/saplog/DISKL001
|--   LOG_VOLUME_SIZE_001              512000
|--   LOG_VOLUME_TYPE_001              F
|--   LRU_FOR_SCAN                     NO
|--   MAXBACKUPDEVS                    2
|--   MAXCPU                           16
|--   MAXDATAVOLUMES                   12
|--   MAXLOCKS                         300000
|--   MAXLOGVOLUMES                    2
|--   MAXPAGER                         64
|--   MAXRGN_REQUEST                   3000
|--   MAXSERVERTASKS                   22
|--   MAXUSERTASKS                     68
|--   MAXVOLUMES                       15
|--   MAX_HASHTABLE_MEMORY             5120
|--   MAX_RETENTION_TIME               480
|--   MAX_SERVERTASK_STACK             100
|--   MAX_SINGLE_HASHTABLE_SIZE        512
|--   MAX_SPECIALTASK_STACK            100
|--   MCOD                             NO
|--   MEMORY_ALLOCATION_LIMIT          0
|--   MIN_RETENTION_TIME               60
|--   MP_RGN_LOOP                      100
|--   OMS_HEAP_BLOCKSIZE               10000
|--   OMS_HEAP_COUNT                   16
|--   OMS_HEAP_LIMIT                   4192256
|--   OMS_HEAP_THRESHOLD               100
|--   OMS_STREAM_TIMEOUT               30
|--   OMS_VERS_THRESHOLD               2097152
|--   OPMSG1                           /dev/console
|--   OPMSG2                           /dev/null
|--   OPTIMIZE_FETCH_REVERSE           YES
|--   OPTIMIZE_JOIN_OPERATOR_SORT      YES
|--   OPTIMIZE_JOIN_OUTER              YES
|--   OPTIMIZE_JOIN_PARALLEL_SERVERS   0
|--   OPTIMIZE_OPERATOR_JOIN_COSTFUNC YES
|--   OPTIM_CACHE                      NO
|--   OPTIM_FIRST_ROWS                 NO
|--   OPTIM_INV_ONLY                   YES
|--   OPTIM_JOIN_FETCH                 0
|--   OPTIM_MAX_MERGE                  500
|--   PACKET_SIZE                      131072
|--   PREALLOCATE_IOWORKER             NO
|--   REQUEST_TIMEOUT                  180
|--   RUNDIRECTORY                     /sapdb/data/wrk/LCP
|--   SEQUENCE_CACHE                   1
|--   SESSION_TIMEOUT                  900
|--   SET_VOLUME_LOCK                  YES
|--   SHAREDSQL                        NO
|--   SHAREDSQL_COMMANDCACHESIZE       32768
|--   SHAREDSQL_EXPECTEDSTATEMENTCOUNT 1500
|--   SHOW_MAX_STACK_USE               NO
|--   SIMULATE_VECTORIO                NEVER
|--   SUPPRESS_CORE                    YES
|--   SYMBOL_DEMANGLING                NO
|--   SYMBOL_RESOLUTION                YES
|--   TRACE_PAGES_BUP                  0
|--   TRACE_PAGES_EV                   2
|--   TRACE_PAGES_GC                   20
|--   TRACE_PAGES_LW                   5
|--   TRACE_PAGES_PG                   3
|--   TRACE_PAGES_SV                   5
|--   TRACE_PAGES_TI                   2
|--   TRACE_PAGES_US                   10
|--   TRACE_PAGES_UT                   5
|--   UPDATESTAT_SAMPLE_ALGO           0
|--   USE_COROUTINES                   NO
|--   USE_OPEN_DIRECT                  NO
|--   USE_STACK_ON_STACK               NO
|--   USE_SYSTEM_PAGE_CACHE            YES
|--   USE_UCONTEXT                     YES
|--   UTILITY_PROTSIZE                 100
|--   VOLUMENO_BIT_COUNT               8
|--   XP_CONVERTER_REGIONS             0
|--   XP_DATA_CACHE_RGNS               0
|--   XP_MAXPAGER                      0
|--   XP_MP_RGN_LOOP                   0
|--   AKDUMP_ALLOWED                 YES
|--   BACKUPHISTFILE                 dbm.knl
|--   BACKUPMED_DEF                  dbm.mdf
|--   CATCACHE_MINSIZE               262144
|--   DATACACHE_RGNS                 64
|--   DELAYCOMMIT                    NO
|--   DELAYLOGWRITER                 0
|--   DIAGSEM                        0
|--   DWIO_AREA_FLUSH                50
|--   DWIO_AREA_SIZE                 50
|--   DWLRU_TAIL_FLUSH               25
|--   DYNTASK_STACK                  NO
|--   _EVENTFILE                       knldiag.evt
|--   _EVENTSIZE                       0
|--   EVENTALIVE_CYCLE               0
|--   FBMLOW_IO_RATE                 10
|--   IDXFILELIST_SIZE               2048
|--   IOPROCSFOR_PRIO                0
|--   IOPROCSFOR_READER              0
|--   IOPROCSPER_DEV                 2
|--   IOPROCSSWITCH                  2
|--   _KERNELDIAGFILE                  knldiag
|--   _KERNELDUMPFILE                  knldump
|--   _KERNELTRACEFILE                 knltrace
|--   LOCKSUPPLY_BLOCK               100
|--   _MAXEVENTS                       100
|--   _MAXEVENTTASKS                   1
|--   MAXGARBAGECOLL                 10
|--   MAXTASKSTACK                   1500
|--   _MAXTRANS                        368
|--   MAXMESSAGE_FILES               69
|--   MBLOCKDATA_SIZE                32768
|--   MBLOCKQUAL_SIZE                16384
|--   MBLOCKSTACK_SIZE               32768
|--   MBLOCKSTRAT_SIZE               8192
|--   MINREPLYSIZE                   4096
|--   MINSERVER_DESC                 17
|--   MPDISP_LOOPS                   2
|--   MPDISP_PRIO                    YES
|--   MPRGN_BUSY_WAIT                YES
|--   MPRGN_DIRTY_READ               YES
|--   MPRGN_PRIO                     YES
|--   MPRGN_QUEUE                    YES
|--   MULTIO_BLOCK_CNT               8
|--   OMSREGIONS                     8
|--   OMSRGNS                        33
|--   PAGESIZE                       8192
|--   PRIOBASE_COM                   10
|--   PRIOBASE_IOC                   80
|--   PRIOBASE_RAV                   80
|--   PRIOBASE_REX                   40
|--   PRIOBASE_U2U                   100
|--   PRIOFACTOR                     80
|--   READAHEADBLOBS                 32
|--   RESTARTTIME                    600
|--   ROWRGNS                        8
|--   _RTEDUMPFILE                     rtedump
|--   SERVERDBFOR_SAP                YES
|--   SERVERCMD_CACHE                23
|--   SERVERDESC_CACHE               93
|--   _SHAREDDYNDATA                   419575
|--   _SHAREDDYNPOOL                   155849
|--   _SHMKERNEL                       3522556
|--   SVP1_CONV_FLUSH                NO
|--   TABRGNS                        8
|--   TASKCLUSTER01                  tw;al;ut;2000*sv,100*bup;10*ev,10*gc;
|--   TASKCLUSTER02                  ti,100*dw;5*us;
|--   TASKCLUSTER03                  equalize
|--   TRANSRGNS                      8
|--   _UNICODE                         YES
|--   USEIOPROCS_ONLY                NO
|--   UTILITYPROTFILE                dbm.utl
|--   WORKDATASIZE                   8192
---   WORKSTACKSIZE                  8192
Thanks!

Catalog Cache Hitrate is to low

The Catalog Cache Hitrate of the DB is to low (40%).
The DB is a MaxDB.
What can I do to bring the Catalog Cache up?

Hello Damian,
You would need to increase the value of catalog cache.
Thanks,
Siva Kumar

Low Hit Ratio on Data Cache

currently I hitting a performance issue on low data cache hit ratio (~0.5 after each calculation). Is there anyway to improve the hit ratio. I have been increased the size of data cache by 50%, however only have a litte improve.Is the bottleneck on I/O? How to improve?Our Essbase Version is 6.2.1 and using Buffered I/O.ThanksLouis

ok,.. the cache hit ratio indicates the percentage of time that a requested piece of information is already in the cache. A higher hit ratio indicates that the data is in the cache more often. This improves performance because the requested data does not have to be retrieved from disk for the next process. it sound like you must have a pretty sparse database,... you might be able to raise the rit ratio by using RLE compression over bit-map if your database is very sparse or has a lot of repeating values. you have to export all the data | clear the database | change the compression type to RLE | re-load the export file | and then calculate to see if it make much difference. (you have to export all data and then reload it so that you don't have mixed compression types) hope that helps you out.

Catalog Cache Hitrate - Low hit rate in the catalog cache (76.170000% 80.

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