Please analyze these lines: stone walls do not a prison make nor iron bars a cage minds innocent and quiet take that for a hermitageHow can I analyze them in any. Define analyze. analyze synonyms, analyze pronunciation, analyze translation. These imbecilities gave me time to form my own conclusions at a glance. Analyze These We review the latest from Charlie Kaufman and Jonathan Demme. Most Popular. Created with Sketch. By Karen Durbin. Oct 8, 2008. Share Tweet Text Share. . of how the media represents certain phenomena, they need to learn some particular research techniques for how to analyze these representations. It is. Learn how to to collect your data and analyze it. These might, for instance. Collecting and analyzing data helps you see whether your intervention brought. Try to analyze why problems in these areas are occurring. Do they occur because of bad strategy formulation or because of bad strategy implementation? Use the ANALYZE statement to collect statistics. These statistics estimate the accuracy of guess data block addresses stored as part of the local rowids in the. ANALYZEPurpose. Use the ANALYZE statement to collect statistics, for example, to: Collect or delete statistics about an index or index partition, table or table partition, index- organized table, cluster, or scalar object attribute. Validate the structure of an index or index partition, table or table partition, index- organized table, cluster, or object reference (REF). Identify migrated and chained rows of a table or cluster. Note. For the collection of most statistics, use the DBMS_STATS package, which lets you collect statistics in parallel, collect global statistics for partitioned objects, and fine tune your statistics collection in other ways. See Oracle Database PL/SQL Packages and Types Reference for more information on the DBMS_STATS package. Use the ANALYZE statement (rather than DBMS_STATS) for statistics collection not related to the cost- based optimizer: To use the VALIDATE or LISTCHAINEDROWS clauses. To collect information on freelist blocks. Prerequisites. The schema object to be analyzed must be local, and it must be in your own schema or you must have the ANALYZEANY system privilege. If you want to list chained rows of a table or cluster into a list table, then the list table must be in your own schema, or you must have INSERT privilege on the list table, or you must have INSERTANYTABLE system privilege. If you want to validate a partitioned table, then you must have the INSERT object privilege on the table into which you list analyzed rowids, or you must have the INSERTANYTABLE system privilege. Semanticsschema. Specify the schema containing the table, index, or cluster. If you omit schema, then Oracle Database assumes the table, index, or cluster is in your own schema. TABLE table. Specify a table to be analyzed. When you analyze a table, the database collects statistics about expressions occurring in any function- based indexes as well. Therefore, be sure to create function- based indexes on the table before analyzing the table. Refer to CREATE INDEX for more information about function- based indexes. When analyzing a table, the database skips all domain indexes marked LOADING or FAILED. For an index- organized table, the database also analyzes any mapping table and calculates its PCT_ACCESSS_DIRECT statistics. These statistics estimate the accuracy of guess data block addresses stored as part of the local rowids in the mapping table. Oracle Database collects the following statistics for a table. Statistics marked with an asterisk are always computed exactly. Table statistics, including the status of domain indexes, appear in the data dictionary views USER_TABLES, ALL_TABLES, and DBA_TABLES in the columns shown in parentheses. Number of rows (NUM_ROWS)* Number of data blocks below the high water markāthe number of data blocks that have been formatted to receive data, regardless whether they currently contain data or are empty (BLOCKS)* Number of data blocks allocated to the table that have never been used (EMPTY_BLOCKS)Average available free space in each data block in bytes (AVG_SPACE)Number of chained rows (CHAIN_COUNT)Average row length, including the row overhead, in bytes (AVG_ROW_LEN)Restrictions on Analyzing Tables Analyzing tables is subject to the following restrictions: You cannot use ANALYZE to collect statistics on data dictionary tables. You cannot use ANALYZE to collect statistics on an external table. Instead, you must use the DBMS_STATS package. You cannot use ANALYZE to collect default statistics on a temporary table. However, if you have already created an association between one or more columns of a temporary table and a user- defined statistics type, then you can use ANALYZE to collect the user- defined statistics on the temporary table. You cannot compute or estimate statistics for the following column types: REF column types, varrays, nested tables, LOB column types (LOB column types are not analyzed, they are skipped), LONG column types, or object types. However, if a statistics type is associated with such a column, then Oracle Database collects user- defined statistics. Specify the partition or subpartition, or the partition or subpartition value, on which you want statistics to be gathered. You cannot use this clause when analyzing clusters. If you specify PARTITION and table is composite- partitioned, then Oracle Database analyzes all the subpartitions within the specified partition. INDEX index. Specify an index to be analyzed. Oracle Database collects the following statistics for an index. Statistics marked with an asterisk are always computed exactly. For conventional indexes, when you compute or estimate statistics, the statistics appear in the data dictionary views USER_INDEXES, ALL_INDEXES, and DBA_INDEXES in the columns shown in parentheses.* Depth of the index from its root block to its leaf blocks (BLEVEL)Number of leaf blocks (LEAF_BLOCKS)Number of distinct index values (DISTINCT_KEYS)Average number of leaf blocks for each index value (AVG_LEAF_BLOCKS_PER_KEY)Average number of data blocks for each index value (for an index on a table) (AVG_DATA_BLOCKS_PER_KEY)Clustering factor (how well ordered the rows are about the indexed values) (CLUSTERING_FACTOR)For domain indexes, this statement invokes the user- defined statistics collection function specified in the statistics type associated with the index (see ASSOCIATE STATISTICS). If no statistics type is associated with the domain index, then the statistics type associated with its indextype is used. If no statistics type exists for either the index or its indextype, then no user- defined statistics are collected. User- defined index statistics appear in the STATISTICS column of the data dictionary views USER_USTATS, ALL_USTATS, and DBA_USTATS. Notes: When you analyze an index from which a substantial number of rows has been deleted, Oracle Database sometimes executes a COMPUTE statistics operation (which can entail a full table scan) even if you request an ESTIMATE statistics operation. Such an operation can be quite time consuming. In some cases, analyzing an index with the ANALYZE statement takes an inordinate amount of time to complete. In these cases, you can use a SQL query to validate the index. If the query determines that there is an inconsistency between a table and the index, then you can use the ANALYZE statement for a thorough analysis of the index. Refer to Oracle Database Administrator's Guide for more information. Restriction on Analyzing Indexes You cannot analyze a domain index that is marked IN_PROGRESS or FAILED. CLUSTER cluster Specify a cluster to be analyzed. When you collect statistics for a cluster, Oracle Database also automatically collects the statistics for all the tables in the cluster and all their indexes, including the cluster index. For both indexed and hash clusters, the database collects the average number of data blocks taken up by a single cluster key (AVG_BLOCKS_PER_KEY). These statistics appear in the data dictionary views ALL_CLUSTERS, USER_CLUSTERS, and DBA_CLUSTERS. The validation clauses let you validate REF values and the structure of the analyzed object. VALIDATE REF UPDATE Clause Specify VALIDATEREFUPDATE to validate the REF values in the specified table, check the rowid portion in each REF, compare it with the true rowid, and correct it, if necessary. You can use this clause only when analyzing a table. If the owner of the table does not have the READ or SELECT object privilege on the referenced objects, then Oracle Database will consider them invalid and set them to null. Subsequently these REF values will not be available in a query, even if it is issued by a user with appropriate privileges on the objects. SET DANGLING TO NULL SETDANGLINGTONULL sets to null any REF values (whether or not scoped) in the specified table that are found to point to an invalid or nonexistent object. VALIDATE STRUCTURE Specify VALIDATESTRUCTURE to validate the structure of the analyzed object. The statistics collected by this clause are not used by the Oracle Database optimizer. For a table, Oracle Database verifies the integrity of each of the data blocks and rows. For an index- organized table, the database also generates compression statistics (optimal prefix compression count) for the primary key index on the table. For a cluster, Oracle Database automatically validates the structure of the cluster tables. For a partitioned table, Oracle Database also verifies that each row belongs to the correct partition. If a row does not collate correctly, then its rowid is inserted into the INVALID_ROWS table. For a temporary table, Oracle Database validates the structure of the table and its indexes during the current session. For an index, Oracle Database verifies the integrity of each data block in the index and checks for block corruption. This clause does not confirm that each row in the table has an index entry or that each index entry points to a row in the table. You can perform these operations by validating the structure of the table with the CASCADE clause. Oracle Database also computes compression statistics (optimal prefix compression count) for all normal indexes. Oracle Database stores statistics about the index in the data dictionary views INDEX_STATS and INDEX_HISTOGRAM. If Oracle Database encounters corruption in the structure of the object, then an error message is returned. In this case, drop and re- create the object. CASCADE Specify CASCADE if you want Oracle Database to validate the structure of the indexes associated with the table or cluster. If you use this clause when validating a table, then the database also validates the indexes defined on the table. If you use this clause when validating a cluster, then the database also validates all the cluster tables indexes, including the cluster index. By default, CASCADE performs a COMPLETE validation, which can be resource intensive. Specify FAST if you want the database to check for the existence of corruptions without reporting details about the corruption.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2016
Categories |