NonStop SQL/MP Reference Manual
Table Of Contents
- What’s New in This Manual
- About This Manual
- A
- Access Options
- ADD DEFINE Command
- AGGREGATE Functions
- Alias
- ALLOCATE File Attribute
- ALTER CATALOG Statement
- ALTER COLLATION Statement
- ALTER DEFINE Command
- ALTER INDEX Statement
- ALTER PROGRAM Statement
- ALTER TABLE Statement
- ALTER VIEW Statement
- APPEND Command
- APPENDCANCEL Command
- APPENDRESTART Command
- AS Clause
- AS DATE/TIME Clause
- ASCII Character Set
- AUDIT File Attribute
- AUDITCOMPRESS File Attribute
- Audited Tables
- AVG Function
- B
- C
- CANCEL Command
- CASE Expression
- CAST Function
- CATALOG Command
- Catalogs
- CATALOGS Table
- CENTER_REPORT Option
- Character Data Types
- Character Expressions
- Character Sets
- CHAR_LENGTH Function
- CLEANUP Command
- CLEARONPURGE File Attribute
- CLOSE Statement
- Clustering Keys
- COLLATE Clause
- Collation Definitions
- Column Identifier
- Columns
- COLUMNS Table
- COMMENT Statement
- Comments
- COMMENTS Table
- COMMIT Option
- COMMIT WORK Statement
- Comparison Predicate
- COMPUTE_TIMESTAMP Function
- CONCAT Clause
- Concurrency
- Constraints
- CONSTRNT Table
- CONTINUE Statement
- CONTROL EXECUTOR Directive
- CONTROL QUERY Directive
- CONTROL TABLE Directive
- CONVERT Command
- CONVERTTIMESTAMP Function
- COPY Command
- Correlation Names
- COUNT Function
- CPRLSRCE Table
- CPRULES Table
- CREATE CATALOG Statement
- CREATE COLLATION Statement
- CREATE CONSTRAINT Statement
- CREATE INDEX Statement
- CREATE SYSTEM CATALOG Command
- CREATE TABLE Statement
- CREATE VIEW Statement
- CURRENT Function
- CURRENT_TIMESTAMP Function
- Cursors
- C89
- D
- Data Dictionary
- Data Types
- DATE Data Type
- DATE_FORMAT Option
- DATE-TIME Data Types
- DATE-TIME Functions
- DATE-TIME Literals
- DATEFORMAT Function
- DATETIME Data Type
- DAYOFWEEK Function
- DCL (Data Control Language) Statements
- DCOMPRESS File Attribute
- DDL (Data Definition Language) Statements
- Deadlocks
- DECIMAL_POINT Option
- DECLARE CURSOR Statement
- DEFAULT Clause
- DEFINEs
- DELETE DEFINE Command
- DELETE Statement
- DESCRIBE INPUT Statement
- DESCRIBE Statement
- Detail Alias
- DETAIL Command
- DISPLAY STATISTICS Command
- DISPLAY USE OF Command
- DISTINCT Clause
- DML (Data Manipulation Language) Statements
- DOWNGRADE CATALOG Command
- DOWNGRADE SYSTEM CATALOG Command
- DROP Statement
- DROP SYSTEM CATALOG Command
- DSL (Data Status Language) Statements
- DSLACK File Attribute
- DUP Command
- Dynamic SQL
- E
- F
- G
- H
- I
- ICOMPRESS File Attribute
- IF/THEN/ELSE Clause
- IN Predicate
- INCLUDE SQLCA Directive
- INCLUDE SQLDA Directive
- INCLUDE SQLSA Directive
- INCLUDE STRUCTURES Directive
- Index Keys
- INDEXES Table
- Indicator Variables and Indicator Parameters
- INFO DEFINE Command
- INITIALIZE SQL Command
- INSERT Statement
- INTERVAL Data Type
- INTERVAL Literals
- INVOKE Directive and Command
- ISLACK File Attribute
- J
- K
- L
- M
- N
- O
- P
- PAGE_COUNT Option
- PAGE FOOTING Command
- PAGE_LENGTH Option
- PAGE_NUMBER Function
- PAGE TITLE Command
- Parallel Index Loading
- Parameters
- PARTITION Clause
- Partitions
- PARTNS Table
- PERUSE Command
- Plans
- POSITION Function
- Predicates
- PREPARE Statement
- Primary Keys
- Print Item
- PROGID File Attribute
- Program Invalidation
- PROGRAMS Table
- Protection View
- PURGE Command
- PURGEDATA Command
- Q
- R
- RECLENGTH File Attribute
- RELEASE Statement
- REPORT FOOTING Command
- REPORT Option
- REPORT TITLE Command
- Report Writer
- Reserved Words
- RESET DEFINE Command
- RESET LAYOUT Command
- RESET PARAM Command
- RESET PREPARED Command
- RESET REPORT Command
- RESET SESSION Command
- RESET STYLE Command
- RESETBROKEN File Attribute
- RIGHT_MARGIN Option
- ROLLBACK WORK Statement
- ROWCOUNT Option
- S
- Sample Database
- SAVE Command
- Search Conditions
- SECURE Command
- SECURE File Attribute
- Security
- SELECT Statement
- SERIALWRITES File Attribute
- SET DEFINE Command
- SET DEFMODE Command
- SET LAYOUT Command
- SET PARAM Command
- SET SESSION Command
- SET STYLE Command
- SETSCALE Function
- Shorthand View
- SHOW CONTROL Command
- SHOW DEFINE Command
- SHOW DEFMODE Command
- SHOW LAYOUT Command
- SHOW PARAM Command
- SHOW PREPARED Command
- SHOW REPORT Command
- SHOW SESSION Command
- SHOW STYLE Command
- Similarity Checks
- SLACK File Attribute
- SPACE Option
- SQL Directive
- SQL Identifiers
- SQLCI
- SQLCI Commands
- SQLCODE
- SQLCOMP Command
- Standards Conformance
- Statements
- Static SQL
- Statistics
- Storage Management Foundation (SMF)
- String Functions
- String Literals
- Subqueries
- SUBSTRING Function
- SUBTOTAL Command
- SUBTOTAL_LABEL Option
- SUM Function
- Super ID
- Syskeys
- System Catalog
- SYSTEM Command
- System DEFINEs
- T
- U
- V
- W
- Z
- ! COMMAND
- =_AUDSERV_XSWAP_node DEFINE
- =_DEFAULTS DEFINE
- =_SORT_DEFAULTS DEFINE
- =_SQL_CAT_HEAP_LIMIT DEFINE
- =_SQL_CMP_DOUBLE_SBB_OFF DEFINE
- =_SQL_CMP_DOUBLE_SBB_ON DEFINE
- =_SQL_CMP_EQ_LIMIT DEFINE
- =_SQL_CMP_EVENT DEFINE
- =_SQL_CMP_EVENT_NO0 DEFINE
- =_SQL_CMP_NO_KS_MJOIN DEFINE
- =_SQL_cmp_node DEFINE
- =_SQL_EXE_DOUBLE_SHUTOFF DEFINE
- =_SQL_EXE_ESPS_CK_CMON DEFINE
- =_SQL_EXE_USE_SWAPVOL DEFINE
- =_SQL_MSG_node DEFINE
- =_SQL_RECGEN_node DEFINE
- =_SQL_TM_node_vol DEFINE
- Index
NonStop SQL/MP Reference Manual—142115
U-11
Examples—UPDATE STATISTICS
prevent it from occurring at all by executing UPDATE STATISTICS at least once
for any partitioned table.
•
Transactions
When your table has many partitions—for example, 100—you might want to avoid
putting the UPDATE STATISTICS statement in a user-defined TMF transaction.
With many partitions, the UPDATE STATISTICS operation might take so long that
TMF might have too little log file space to perform all the logging required by other
TMF transactions at the time.
If no user-defined TMF transaction is in progress when UPDATE STATISTICS
executes, SQL starts several for the operation but does not include scanning the
table for information within a transaction. Because UPDATE STATISTICS uses
BROWSE ACCESS to scan the table, the results are approximate.
•
Retrieving statistics from catalog tables
To see current statistics, use the SELECT statement to retrieve the information from
the catalog tables. For example, the second-highest value of a column is stored in
the COLUMNS table. The STATISTICSTIME column of the BASETABS table
contains the time that statistics for the table were last updated, stored as a timestamp
in Greenwich mean time.
See CATALOGS Table
on page C-9 or the entry for a specific catalog table for more
information about the information stored in the catalog.
Examples—UPDATE STATISTICS
•
The following statement updates all statistics for a table named PARTLOC on the
current default volume and subvolume without invalidating the associated programs:
UPDATE ALL STATISTICS FOR TABLE PARTLOC NO RECOMPILE;
•
The following statement updates statistics for columns in the primary key or in
indexes for a table named STUDENTS, directing SQL to calculate the statistics
based on the contents of the first 300 blocks in each partition:
UPDATE STATISTICS FOR TABLE STUDENTS SAMPLE 300 BLOCKS;
UPGRADE CATALOG Command
UPGRADE CATALOG is an SQLCI utility command that converts catalogs to a newer
version so the catalogs can register objects associated with a newer version of NonStop
SQL/MP software.
UPGRADE CATALOG[S] [ catalogs ] [ TO version ] ;